The inalloca argument attribute allows the caller to take the address of outgoing stack arguments. An inalloca argument must be a pointer to stack memory produced by an alloca instruction. The alloca, or argument allocation, must also be tagged with the inalloca keyword.

Only the last argument may have the inalloca attribute, and that argument is guaranteed to be passed in memory. An argument allocation may be used by a call at most once because the call may deallocate it. The inalloca attribute cannot be used in conjunction with other attributes that affect argument storage, like inreg , nest , sret , or byval. When the call site is reached, the argument allocation must have been the most recent stack allocation that is still live, or the behavior is undefined.

It is possible to allocate additional stack space after an argument allocation and before its call site, but it must be cleared off with llvm. The inalloca attribute requires a type argument, which must be the same as the pointee type of the argument.

See Design and Usage of the InAlloca Attribute for more information on how to use this attribute. This indicates that the pointer parameter specifies the address of a structure that is the return value of the function in the source program. This pointer must be guaranteed by the caller to be valid: loads and stores to the structure may be assumed by the callee not to trap and to be properly aligned.

The sret type argument specifies the in memory type, which must be the same as the pointee type of the argument. The elementtype argument attribute can be used to specify a pointer element type in a way that is compatible with opaque pointers. The elementtype attribute by itself does not carry any specific semantics.

However, certain intrinsics may require this attribute to be present and assign it particular semantics. This will be documented on individual intrinsics. The attribute may only be applied to pointer typed arguments of intrinsic calls.

It cannot be applied to non-intrinsic calls, and cannot be applied to parameters on function declarations. For non-opaque pointers, the type passed to elementtype must match the pointer element type. This indicates that the pointer value or vector of pointers has the specified alignment. If applied to a vector of pointers, all pointers elements have the specified alignment. If the pointer value does not have the specified alignment, poison value is returned or passed instead. The align attribute should be combined with the noundef attribute to ensure a pointer is aligned, or otherwise the behavior is undefined.

Note that align 1 has no effect on non-byval, non-preallocated arguments. Note that this attribute has additional semantics when combined with the byval or preallocated attribute, which are documented there.

This indicates that memory locations accessed via pointer values based on the argument or return value are not also accessed, during the execution of the function, via pointer values not based on the argument or return value. This guarantee only holds for memory locations that are modified , by any means, during the execution of the function. The attribute on a return value also has additional semantics described below. The caller shares the responsibility with the callee for ensuring that these requirements are met.

For further details, please see the discussion of the NoAlias response in alias analysis. Note that this definition of noalias is intentionally similar to the definition of restrict in C99 for function arguments. Furthermore, the semantics of the noalias attribute on return values are stronger than the semantics of the attribute when used on function arguments. On function return values, the noalias attribute indicates that the function acts like a system memory allocation function, returning a pointer to allocated storage disjoint from the storage for any other object accessible to the caller.

This attribute is motivated to model and optimize Swift error handling. It can be applied to a parameter with pointer to pointer type or a pointer-sized alloca. At the call site, the actual argument that corresponds to a swifterror parameter has to come from a swifterror alloca or the swifterror parameter of the caller. A swifterror value either the parameter or the alloca can only be loaded and stored from, or used as a swifterror argument. This is not a valid attribute for return values and can only be applied to one parameter.

These constraints allow the calling convention to optimize access to swifterror variables by associating them with a specific register at call boundaries rather than placing them in memory.

Since this does change the calling convention, a function which uses the swifterror attribute on a parameter is not ABI-compatible with one which does not. These constraints also allow LLVM to assume that a swifterror argument does not alias any other memory visible within a function and that a swifterror alloca passed as an argument does not escape. This attribute indicates that the function does not dereference that pointer argument, even though it may read or write the memory that the pointer points to if accessed through other pointers.

If a function reads from or writes to a readnone pointer argument, the behavior is undefined. This attribute indicates that the function does not write through this pointer argument, even though it may write to the memory that the pointer points to. This attribute indicates that the function may write to, but does not read through this pointer argument even though it may read from the memory that the pointer points to.

The supported values of name includes those built in to LLVM and any provided by loaded plugins. Specifying a GC strategy will cause the compiler to alter its output in order to support the named garbage collection algorithm.

Note that LLVM itself does not contain a garbage collector, this functionality is restricted to generating machine code which can interoperate with a collector provided externally. The purpose of this feature is to allow frontends to associate language-specific runtime metadata with specific functions and make it available through the function pointer while still allowing the function pointer to be called.

This implies that the IR symbol points just past the end of the prefix data. For instance, take the example of a function annotated with a single i32 ,. The function will be placed such that the beginning of the prefix data is aligned. A function may have prefix data but no body. The prologue attribute allows arbitrary code encoded as bytes to be inserted prior to the function body. This can be used for enabling function hot-patching and instrumentation. To maintain the semantics of ordinary function calls, the prologue data must have a particular format.

This allows the inliner and other passes to reason about the semantics of the function definition without needing to reason about the prologue data. Obviously this makes the format of the prologue data highly target dependent. A trivial example of valid prologue data for the x86 architecture is i8 , which encodes the nop instruction:.

A function may have prologue data but no body. The personality attribute permits functions to specify what function to use for exception handling. Attribute groups are groups of attributes that are referenced by objects within the IR. They are important for keeping.

ll files readable, because a lot of functions will use the same set of attributes. In the degenerative case of a. ll file that corresponds to a single. c file, the single attribute group will capture the important command line flags used to build that file. An attribute group is a module-level object. An object may refer to more than one attribute group. In that situation, the attributes from the different groups are merged.

Function attributes are set to communicate additional information about a function. Function attributes are considered to be part of the function, not of the function type, so functions with different function attributes can have the same function type. Function attributes are simple keywords that follow the type specified. If multiple attributes are needed, they are space separated.

Describes the behavior of an allocation function. The KIND string contains comma separated entries from the following options:. The first three options are mutually exclusive, and the remaining options describe more details of how the function behaves. In some parallel execution models, there exist operations that cannot be made control-dependent on any additional values. We call such operations convergent , and mark them with this attribute.

When it appears on a function, it indicates that calls to this function should not be made control-dependent on additional values. For example, the intrinsic llvm. barrier0 is convergent , so calls to this intrinsic cannot be made control-dependent on additional values. This is particularly useful on indirect calls; without this we may treat such calls as though the target is non-convergent.

The optimizer may remove the convergent attribute on functions when it can prove that the function does not execute any convergent operations. When instrumenting code with sanitizers, it can be important to skip certain functions to ensure no instrumentation is applied to them. This attribute tells the code generator whether the function should keep the frame pointer. The code generator may emit the frame pointer even if this attribute says the frame pointer can be eliminated. The allowed string values are:.

This attribute indicates that this function is a hot spot of the program execution. The function will be optimized more aggressively and will be placed into special subsection of the text section to improving locality. When profile feedback is enabled, this attribute has the precedence over the profile information.

By marking a function hot , users can work around the cases where the training input does not have good coverage on all the hot functions. This attribute specifies the possible memory effects of the call-site or function.

It allows specifying the possible access kinds none , read , write , or readwrite for the possible memory location kinds argmem , inaccessiblemem , as well as a default.

It is best understood by example:. If the memory attribute is not specified, then memory readwrite is implied all memory effects are possible. Thus, the call-site annotation takes precedence over the potential effects described by either the function annotation or the operand bundles. This attribute indicates that calls to the function cannot be duplicated. A call to a noduplicate function may be moved within its parent function, but may not be duplicated within its parent function.

A function containing a noduplicate call may still be an inlining candidate, provided that the call is not duplicated by inlining. That implies that the function has internal linkage and only has one call site, so the original call is dead after inlining.

This function attribute indicates that the function does not, directly or transitively, call a memory-deallocation function free , for example on a memory allocation which existed before the call.

As a result, uncaptured pointers that are known to be dereferenceable prior to a call to a function with the nofree attribute are still known to be dereferenceable after the call. The capturing condition is necessary in environments where the function might communicate the pointer to another thread which then deallocates the memory.

Alternatively, nosync would ensure such communication cannot happen and even captured pointers cannot be freed by the function.

As a result, perhaps surprisingly, a nofree function can return a pointer to a previously deallocated memory object. Disallows implicit floating-point code. This inhibits optimizations that use floating-point code and floating-point registers for operations that are not nominally floating-point.

LLVM instructions that perform floating-point operations or require access to floating-point registers may still cause floating-point code to be generated. This includes integer vectors.

Vector instructions present in IR may still cause vector code to be generated. This function attribute indicates that most optimization passes will skip this function, with the exception of interprocedural optimization passes. This attribute cannot be used together with the alwaysinline attribute; this attribute is also incompatible with the minsize attribute and the optsize attribute. This attribute requires the noinline attribute to be specified on the function as well, so the function is never inlined into any caller.

Only functions with the alwaysinline attribute are valid candidates for inlining into the body of this function. This attribute tells the code generator that the code generated for this function needs to follow certain conventions that make it possible for a runtime function to patch over it later.

The exact effect of this attribute depends on its string value, for which there currently is one legal possibility:. It guarantees that the first instruction of the function will be large enough to accommodate a short jump instruction, and will be sufficiently aligned to allow being fully changed via an atomic compare-and-swap instruction.

While the first requirement can be satisfied by inserting large enough NOP, LLVM can and will try to re-purpose an existing instruction i. one that would have to be emitted anyway as the patchable instruction larger than a short jump. This attribute by itself does not imply restrictions on inter-procedural optimizations. All of the semantic effects the patching may have to be separately conveyed via the linkage type.

This attribute indicates that the function will trigger a guard region in the end of the stack. It ensures that accesses to the stack must be no further apart than the size of the guard region to a previous access of the stack.

It takes one required string value, the name of the stack probing function that will be called. If a function that has a "probe-stack" attribute is inlined into a function with another "probe-stack" attribute, the resulting function has the "probe-stack" attribute of the caller.

If a function that has a "probe-stack" attribute is inlined into a function that has no "probe-stack" attribute at all, the resulting function has the "probe-stack" attribute of the callee. This attribute controls the behavior of stack probes: either the "probe-stack" attribute, or ABI-required stack probes, if any.

It defines the size of the guard region. It ensures that if the function may use more stack space than the size of the guard region, stack probing sequence will be emitted. It takes one required integer value, which is by default. If a function that has a "stack-probe-size" attribute is inlined into a function with another "stack-probe-size" attribute, the resulting function has the "stack-probe-size" attribute that has the lower numeric value.

If a function that has a "stack-probe-size" attribute is inlined into a function that has no "stack-probe-size" attribute at all, the resulting function has the "stack-probe-size" attribute of the callee. This attribute indicates that SafeStack protection is enabled for this function. This attribute indicates that Speculative Load Hardening should be enabled for the function body.

Speculative Load Hardening is a best-effort mitigation against information leak attacks that make use of control flow miss-speculation - specifically miss-speculation of whether a branch is taken or not.

When inlining, the attribute is sticky. Inlining a function that carries this attribute will cause the caller to gain the attribute. This is intended to provide a maximally conservative model where the code in a function annotated with this attribute will always even after inlining end up hardened. This attribute indicates that the function should emit a stack smashing protector. A heuristic is used to determine if a function needs stack protectors or not.

The heuristic used will enable protectors for functions with:. Variables that are identified as requiring a protector will be arranged on the stack such that they are adjacent to the stack protector guard. If a function with an ssp attribute is inlined into a calling function, the attribute is not carried over to the calling function. This attribute causes a strong heuristic to be used when determining if a function needs stack protectors. The strong heuristic will enable protectors for functions with:.

The specific layout rules are:. This overrides the ssp function attribute. This attribute indicates that the function should always emit a stack smashing protector. This overrides the ssp and sspstrong function attributes. This indicates the denormal subnormal handling that may be assumed for the default floating-point environment. This is a comma separated pair. The elements may be one of "ieee" , "preserve-sign" , or "positive-zero".

The first entry indicates the flushing mode for the result of floating point operations. The second indicates the handling of denormal inputs to floating point instructions. For compatibility with older bitcode, if the second value is omitted, both input and output modes will assume the same mode. If this is attribute is not specified, the default is "ieee,ieee". If the output mode is "preserve-sign" , or "positive-zero" , denormal outputs may be flushed to zero by standard floating-point operations.

It is not mandated that flushing to zero occurs, but if a denormal output is flushed to zero, it must respect the sign mode.

Not all targets support all modes. While this indicates the expected floating point mode the function will be executed with, this does not make any attempt to ensure the mode is consistent. User or platform code is expected to set the floating point mode appropriately before function entry.

If the input mode is "preserve-sign" , or "positive-zero" , a floating-point operation must treat any input denormal value as zero. In some situations, if an instruction does not respect this mode, the input may need to be converted to 0 as if by llvm.

canonicalize during lowering for correctness. This attribute can be attached to a call to list the vector functions associated to the function. Notice that the attribute cannot be attached to a invoke or a callbr instruction. The attribute consists of a comma separated list of mangled names. The order of the list does not imply preference it is logically a set. The compiler is free to pick any listed vector function of its choosing.

The declaration of the variant must be present in the IR Module. The signature of the vector variant is determined by the rules of the Vector Function ABI VFABI specifications of the target. html , respectively.

For X86 and Arm targets, the values of the tokens in the standard name are those that are defined in the VFABI. For all targets currently supported x86, Arm and Internal LLVM , the remaining tokens can have the following values Attributes may be set to communicate additional information about a global variable. Unlike function attributes , attributes on a global variable are grouped into a single attribute group. Operand bundles are tagged sets of SSA values that can be associated with certain LLVM instructions currently only call s and invoke s.

In a way they are like metadata, but dropping them is incorrect and will change program semantics. This reflects the fact that the operand bundles are conceptually a part of the call or invoke , not the callee being dispatched to.

Operand bundles are a generic mechanism intended to support runtime-introspection-like functionality for managed languages. While the exact semantics of an operand bundle depend on the bundle tag, there are certain limitations to how much the presence of an operand bundle can influence the semantics of a program. As long as the behavior of an operand bundle is describable within these restrictions, LLVM does not need to have special knowledge of the operand bundle to not miscompile programs containing it.

Deoptimization operand bundles are characterized by the "deopt" operand bundle tag. There can be at most one "deopt" operand bundle attached to a call site.

Exact details of deoptimization is out of scope for the language reference, but it usually involves rewriting a compiled frame into a set of interpreted frames. Deoptimization operand bundles do not capture their operands except during deoptimization, in which case control will not be returned to the compiled frame.

The inliner knows how to inline through calls that have deoptimization operand bundles. inlining f into g in the following example. Funclet operand bundles are characterized by the "funclet" operand bundle tag. These operand bundles indicate that a call site is within a particular funclet.

There can be at most one "funclet" operand bundle attached to a call site and it must have exactly one bundle operand. Similarly, if no funclet EH pads have been entered-but-not-yet-exited, executing a call or invoke with a "funclet" bundle is undefined behavior.

GC transition operand bundles are characterized by the "gc-transition" operand bundle tag. These operand bundles mark a call as a transition between a function with one GC strategy to a function with a different GC strategy.

If coordinating the transition between GC strategies requires additional code generation at the call site, these bundles may contain any values that are needed by the generated code.

For more details, see GC Transitions. The bundle contain an arbitrary list of Values which need to be passed to GC transition code.

It is assumed that these arguments must be available before and after but not necessarily during the execution of the callee. Operand bundles on an llvm. assume allows representing assumptions, such as that a parameter attribute or a function attribute holds for a certain value at a certain location. Operand bundles enable assumptions that are either hard or impossible to represent as a boolean argument of an llvm. allows the optimizer to assume that at location of call to llvm.

allows the optimizer to assume that the llvm. Just like for the argument of llvm. assume , if any of the provided guarantees are violated at runtime the behavior is undefined. While attributes expect constant arguments, assume operand bundles may be provided a dynamic value, for example:.

If the operand bundle value violates any requirements on the attribute value, the behavior is undefined, unless one of the following exceptions applies:. This has the form:. This indicates that no pointer based on one of its arguments can alias any pointer based on the other. Even if the assumed property can be encoded as a boolean value, like nonnull , using operand bundles to express the property can still have benefits:. Preallocated operand bundles are characterized by the "preallocated" operand bundle tag.

These operand bundles allow separation of the allocation of the call argument memory from the call site. This is necessary to pass non-trivially copyable objects by value in a way that is compatible with MSVC on some targets. There can be at most one "preallocated" operand bundle attached to a call site and it must have exactly one bundle operand, which is a token generated by llvm. A call with this operand bundle should not adjust the stack before entering the function, as that will have been done by one of the llvm.

statepoint intrinsic. The operand bundle must contain every pointer to a garbage collected object which potentially needs to be updated by the garbage collector. When lowered, any relocated value will be recorded in the corresponding stackmap entry. See the intrinsic description for further details.

A "clang. attachedcall" operand bundle on a call indicates the call is implicitly followed by a marker instruction and a call to an ObjC runtime function that uses the result of the call. The return value of a call with this bundle is used by a call to llvm. The operand bundle is needed to ensure the call is immediately followed by the marker instruction and the ObjC runtime call in the final output.

Pointer Authentication operand bundles are characterized by the "ptrauth" operand bundle tag. They are described in the Pointer Authentication document. A "kcfi" operand bundle on an indirect call indicates that the call will be preceded by a runtime type check, which validates that the call target is prefixed with a type identifier that matches the operand bundle attribute. These blocks are internally concatenated by LLVM and treated as a single unit, but may be separated in the.

ll file if desired. The syntax is very simple:. The strings can contain any character by escaping non-printable characters. s file. A module may specify a target specific data layout string that specifies how data is to be laid out in memory.

The syntax for the data layout is simply:. Each specification starts with a letter and may include other information after the letter to define some aspect of the data layout.

The specifications accepted are as follows:. This specifies the alignment for function pointers. If present, specifies that llvm names are mangled in the output.

The mangling style options are. When constructing the data layout for a given target, LLVM starts with a default set of specifications which are then possibly overridden by the specifications in the datalayout keyword.

The default specifications are given in this list:. The function of the data layout string may not be what you expect. Notably, this is not a specification from the frontend of what alignment the code generator should use. Instead, if specified, the target data layout is required to match what the ultimate code generator expects.

This string is used by the mid-level optimizers to improve code, and this only works if it matches what the ultimate code generator uses.

There is no way to generate IR that does not embed this target-specific detail into the IR. A module may specify a target triple string that describes the target host.

The syntax for the target triple is simply:. The canonical forms are:. This information is passed along to the backend so that it generates code for the proper architecture. A memory object, or simply object, is a region of a memory space that is reserved by a memory allocation such as alloca , heap allocation calls, and global variable definitions.

Once it is allocated, the bytes stored in the region can only be read or written through a pointer that is based on the allocation value. If a pointer that is not based on the object tries to read or write to the object, it is undefined behavior.

A lifetime of a memory object is a property that decides its accessibility. Unless stated otherwise, a memory object is alive since its allocation, and dead after its deallocation. start and llvm. end intrinsic function calls. Any memory access must be done through a pointer value associated with an address range of the memory access, otherwise the behavior is undefined.

Pointer values are associated with address ranges according to the following rules:. LLVM IR does not associate types with memory. The result type of a load merely indicates the size and alignment of the memory from which to load, as well as the interpretation of the value.

The first operand type of a store similarly only indicates the size and alignment of the store. Consequently, type-based alias analysis, aka TBAA, aka -fstrict-aliasing , is not applicable to general unadorned LLVM IR. Metadata may be used to encode additional information which specialized optimization passes may use to implement type-based alias analysis.

Given a function call and a pointer that is passed as an argument or stored in the memory before the call, a pointer is captured by the call if it makes a copy of any part of the pointer that outlives the call. To be precise, a pointer is captured if one or more of the following conditions hold:. The optimizers must not change the number of volatile operations or change their order of execution relative to other volatile operations. The optimizers may change the order of volatile operations relative to non-volatile operations.

A volatile load or store may have additional target-specific semantics. Volatile operations may use addresses which do not point to memory like MMIO registers. This means the compiler may not use a volatile operation to prove a non-volatile access to that address has defined behavior. The allowed side-effects for volatile accesses are limited. If a non-volatile store to a given address would be legal, a volatile operation may modify the memory at that address.

A volatile operation may not modify any other memory accessible by the module being compiled. A volatile operation may not call any code in the current module. In general without target specific context , the address space of a volatile operation may not be changed. Different address spaces may have different trapping behavior when dereferencing an invalid pointer. The compiler may assume execution will continue after a volatile operation, so operations which modify memory or may have undefined behavior can be hoisted past a volatile operation.

As an exception to the preceding rule, the compiler may not assume execution will continue after a volatile store operation. This restriction is necessary to support the somewhat common pattern in C of intentionally storing to an invalid pointer to crash the program. In the future, it might make sense to allow frontends to control this behavior.

IR-level volatile loads and stores cannot safely be optimized into llvm. memcpy or llvm. memmove intrinsics even when those intrinsics are flagged volatile. Similarly, IR-level volatile loads and stores cannot change from integer to floating-point or vice versa. Platforms may rely on volatile loads and stores of natively supported data width to be executed as single instruction. For example, in C this holds for an l-value of volatile primitive type with native hardware support, but not necessarily for aggregate types.

The frontend upholds these expectations, which are intentionally unspecified in the IR. The LLVM IR does not define any way to start parallel threads of execution or to register signal handlers. For a more informal introduction to this model, see the LLVM Atomic Instructions and Concurrency Guide.

Note that program order does not introduce happens-before edges between a thread and signals executing inside that thread. For the purposes of this section, initialized globals are considered to have a write of the initializer which is atomic and happens before any other read or write of the memory in question.

For each byte of a read R, R byte may see any write to the same byte, except:. R returns the value composed of the series of bytes it read. This implies that some bytes within the value may be undef without the entire value being undef.

Note that in cases where none of the atomic intrinsics are used, this model places only one restriction on IR transformations on top of what is required for single-threaded execution: introducing a store to a byte which might not otherwise be stored is not allowed in general.

Specifically, in the case where another thread might write to and read from an address, introducing a store can change a load that may see exactly one write into a load that may see multiple writes.

Atomic instructions cmpxchg , atomicrmw , fence , atomic load , and atomic store take ordering parameters that determine which other atomic instructions on the same address they synchronize with. For a simpler introduction to the ordering constraints, see the LLVM Atomic Instructions and Concurrency Guide.

The default LLVM floating-point environment assumes that floating-point instructions do not have side effects. Results assume the round-to-nearest rounding mode.

No floating-point exception state is maintained in this environment. Therefore, there is no attempt to create or preserve invalid operation SNaN or division-by-zero exceptions. The benefit of this exception-free assumption is that floating-point operations may be speculated freely without any other fast-math relaxations to the floating-point model. Code that requires different behavior than this should use the Constrained Floating-Point Intrinsics.

LLVM IR floating-point operations fneg , fadd , fsub , fmul , fdiv , frem , fcmp , phi , select and call may use the following flags to enable otherwise unsafe floating-point transformations.

Use-list directives encode the in-memory order of each use-list, allowing the order to be recreated. Use-list directives may appear at function scope or global scope. They are not instructions, and have no effect on the semantics of the IR. The source filename string is set to the original module identifier, which will be the name of the compiled source file when compiling from source through the clang front end, for example.

It is then preserved through the IR and bitcode. This is currently necessary to generate a consistent unique global identifier for local functions used in profile data, which prepends the source file name to the local function name. The LLVM type system is one of the most important features of the intermediate representation. Being typed enables a number of optimizations to be performed on the intermediate representation directly, without having to do extra analyses on the side before the transformation.

A strong type system makes it easier to read the generated code and enables novel analyses and transformations that are not feasible to perform on normal three address code representations. The function type can be thought of as a function signature. It consists of a return type and a list of formal parameter types. The return type of a function type is a void type or first class type — except for label and metadata types.

Optionally, the parameter list may include a type Variable argument functions can access their arguments with the variable argument handling intrinsic functions. The first class types are perhaps the most important. Values of these types are the only ones which can be produced by instructions. The integer type is a very simple type that simply specifies an arbitrary bit width for the integer type desired. Any bit width from 1 bit to 2 23 about 8 million can be specified. The number of bits the integer will occupy is specified by the N value.

The binary format of half, float, double, and fp correspond to the IEEE specifications for binary16, binary32, binary64, and binary respectively.

The operations allowed on it are quite limited. Only few intrinsics are allowed: stride load and store, zero and dot product. No instruction is allowed for this type. There are no arguments, arrays, pointers, vectors or constants of this type. The operations allowed on it are quite limited: parameters and return values, load and store, and bitcast.

There are no arrays, vectors or constants of this type. The pointer type ptr is used to specify memory locations.

Pointers are commonly used to reference objects in memory. Pointer types may have an optional address space attribute defining the numbered address space where the pointed-to object resides. For example, ptr addrspace 5 is a pointer to address space 5.

In addition to integer constants, addrspace can also reference one of the address spaces defined in the datalayout string. addrspace "A" will use the alloca address space, addrspace "G" the default globals address space and addrspace "P" the program address space.

The semantics of non-zero address spaces are target-specific. Memory access through a non-dereferenceable pointer is undefined behavior in any address space.

If an object can be proven accessible through a pointer with a different address space, the access may be modified to use that address space. Exceptions apply if the operation is volatile. See the opaque pointers document for more information. A vector type is a simple derived type that represents a vector of elements. Vector types are used when multiple primitive data are operated in parallel using a single instruction SIMD.

A vector type requires a size number of elements , an underlying primitive data type, and a scalable property to represent vectors where the exact hardware vector length is unknown at compile time. Vector types are considered first class. In general vector elements are laid out in memory in the same way as array types. Such an analogy works fine as long as the vector elements are byte sized. A bitcast from a vector type to a scalar integer type will see the elements being packed together without padding.

The order in which elements are inserted in the integer depends on endianess. For little endian element zero is put in the least significant bits of the integer, and for big endian element zero is put in the most significant bits. The number of elements is a constant integer value larger than 0; elementtype may be any integer, floating-point or pointer type.

Vectors of size zero are not allowed. For scalable vectors, the total number of elements is a constant multiple called vscale of the specified number of elements; vscale is a positive integer that is unknown at compile time and the same hardware-dependent constant for all scalable vectors at run time.

The size of a specific scalable vector type is thus constant within IR, even if the exact size in bytes cannot be determined until run time. The token type is used when a value is associated with an instruction but all uses of the value must not attempt to introspect or obscure it. As such, it is not appropriate to have a phi or select of type token.

The metadata type represents embedded metadata. No derived types may be created from metadata except for function arguments. Aggregate Types are a subset of derived types that can contain multiple member types. Arrays and structs are aggregate types. Vectors are not considered to be aggregate types. The array type is a very simple derived type that arranges elements sequentially in memory.

The array type requires a size number of elements and an underlying data type. The number of elements is a constant integer value; elementtype may be any type with a size.

There is no restriction on indexing beyond the end of the array implied by a static type though there are restrictions on indexing beyond the bounds of an allocated object in some cases.

The structure type is used to represent a collection of data members together in memory. The elements of a structure may be any type that has a size. In non-packed structs, padding between field types is inserted as defined by the DataLayout string in the module, which is required to match what the underlying code generator expects. A literal structure is defined inline with other types e. Literal types are uniqued by their contents and can never be recursive or opaque since there is no way to write one.

Identified types can be recursive, can be opaqued, and are never uniqued. Opaque structure types are used to represent structure types that do not have a body specified. This corresponds for example to the C notion of a forward declared structure. LLVM has several different basic types of constants. This section describes them all and their syntax. The one non-intuitive notation for constants is the hexadecimal form of floating-point constants. The only time hexadecimal floating-point constants are required and the only time that they are generated by the disassembler is when a floating-point constant must be emitted but it cannot be represented as a decimal floating-point number in a reasonable number of digits.

When using the hexadecimal form, constants of types bfloat, half, float, and double are represented using the digit form shown above which matches the IEEE representation for double ; bfloat, half and float values must, however, be exactly representable as bfloat, IEEE half, and IEEE single precision respectively.

Hexadecimal format is always used for long double, and there are three forms of long double. The bit format used by x86 is represented as 0xK followed by 20 hexadecimal digits. The bit format used by PowerPC two adjacent doubles is represented by 0xM followed by 32 hexadecimal digits.

The IEEE bit format is represented by 0xL followed by 32 hexadecimal digits. Long doubles will only work if they match the long double format on your target. The IEEE bit format half precision is represented by 0xH followed by 4 hexadecimal digits.

The bfloat bit format is represented by 0xR followed by 4 hexadecimal digits. All hexadecimal formats are big-endian sign bit at the left. Complex constants are a potentially recursive combination of simple constants and smaller complex constants. The addresses of global variables and functions are always implicitly valid link-time constants. These constants are explicitly referenced when the identifier for the global is used and always have pointer type.

For example, the following is a legal LLVM file:. Poison values are stronger than undef, and enable more optimizations. Undefined values are useful because they indicate to the compiler that the program is well defined no matter what value is used.

This gives the compiler more freedom to optimize. Here are some examples of potentially surprising transformations that are valid in pseudo IR :. This is safe because all of the output bits are affected by the undef bits. Any output bit can have a zero or one depending on the input bits. These logical operations have bits that are not always affected by the input.

Instead, the value is logically read from arbitrary registers that happen to be around when needed, so the value is not necessarily consistent over time. These examples show the crucial difference between an undefined value and undefined behavior. However, in the second example, we can make a more aggressive assumption: because the undef is allowed to be an arbitrary value, we are allowed to assume that it could be zero.

Since a divide by zero has undefined behavior , we are allowed to assume that the operation does not execute at all. This allows us to delete the divide and all code after it. A store of an undefined value can be assumed to not have any effect; we can assume that the value is overwritten with bits that happen to match what was already there.

This argument is only valid if the stored value is provably not poison. However, a store to an undefined location could clobber arbitrary memory, therefore, it has undefined behavior. Branching on an undefined value is undefined behavior. This explains optimizations that depend on branch conditions to construct predicates, such as Correlated Value Propagation and Global Value Numbering.

In case of switch instruction, the branch condition should be frozen, otherwise it is undefined behavior. A poison value is a result of an erroneous operation. In order to facilitate speculative execution, many instructions do not invoke immediate undefined behavior when provided with illegal operands, and return a poison value instead. A notable exception is the select instruction. Propagation of poison can be stopped with the freeze instruction. It is correct to replace a poison value with an undef value or any value of the type.

This means that immediate undefined behavior occurs if a poison value is used as an instruction operand that has any values that trigger undefined behavior. Notably this includes but is not limited to :. Given a program execution, a value is well defined if the value does not have an undef bit and is not poison in the execution. An aggregate value or vector is well defined if its elements are well defined. The result of freeze instruction is well defined regardless of its operand.

Pointer equality tests between labels addresses results in undefined behavior — though, again, comparison against null is ok, and no label is equal to the null pointer. This may be passed around as an opaque pointer sized value as long as the bits are not inspected. This allows ptrtoint and arithmetic to be performed on these values so long as the original value is reconstituted before the indirectbr instruction. Finally, some targets may provide defined semantics when using the value as the operand to an inline assembly, but that is target specific.

The resulting pointer has the same type as the underlying function. The resulting pointer is permitted, but not required, to be different from a pointer to the function, and it may have different values in different translation units. These constants may be useful in low-level programs, such as operating system kernels, which need to refer to the actual function body.

Constant expressions are used to allow expressions involving other constants to be used as constants. Constant expressions may be of any first class type and may involve any LLVM operation that does not have side effects e.

load and call are not supported. The following is the syntax for constant expressions:. LLVM supports inline assembler expressions as opposed to Module-Level Inline Assembly through the use of a special value. This value represents the inline assembler as a template string containing the instructions to emit , a list of operand constraints stored as a string , a flag that indicates whether or not the inline asm expression has side effects, and a flag indicating whether the function containing the asm needs to align its stack conservatively.

s file — and thus must contain assembly syntax known to LLVM. However, to be clear, the syntax of the template and constraint strings described here is not the same as the syntax accepted by GCC and Clang, and, while most constraint letters are passed through as-is by Clang, some get translated to other codes when converting from the C source to the LLVM assembly.

Inline assembler expressions may only be used as the callee operand of a call or an invoke instruction. Thus, typically we have:. Inline asms with side effects not visible in the constraint list must be marked as having side effects. In some cases inline asms will contain code that will not work unless the stack is aligned in some way, such as calls or SSE instructions on x86, yet will not contain code that does that alignment within the asm.

Inline asms also support using non-standard assembly dialects. The assumed dialect is ATT. Currently, ATT and Intel are the only supported dialects. An example is:. The constraint list is a comma-separated string, each element containing one or more constraint codes.

There are three different types of constraints, which are distinguished by a prefix symbol in front of the constraint code: Output, Input, and Clobber. The constraints must always be given in that order: outputs first, then inputs, then clobbers.

They cannot be intermingled. This indicates that the assembly will write to this operand, and the operand will then be made available as a return value of the asm expression. Output constraints do not consume an argument from the call instruction. Except, see below about indirect outputs. Normally, it is expected that no output locations are written to by the assembly expression until all of the inputs have been read. As such, LLVM may assign the same register to an output and an input.

If this is not safe e. Input constraints do not have a prefix — just the constraint codes. Each input constraint will consume one argument from the call instruction. It is not permitted for the asm to write to any input register or memory location unless that input is tied to an output.

Note also that multiple inputs may all be assigned to the same register, if LLVM can determine that they necessarily all contain the same value. In that case, no other input may share the same register as the input tied to the early-clobber even when the other input has the same value. You may only tie an input to an output which has a register constraint, not a memory constraint.

Only a single input may be tied to an output. Firstly, the registers are not guaranteed to be consecutive. So, on those architectures that have instructions which operate on multiple consecutive instructions, this is not an appropriate way to support them. the bit SparcV8 has a bit load, which instruction takes a single bit register. The hardware then loads into both the named register, and the next register.

This feature of inline asm would not be useful to support that. A few of the targets provide a template string modifier allowing explicit access to the second register of a two-register operand e. On such an architecture, you can actually access the second allocated register yet, still, not any subsequent ones. see the description of the A constraint on X86, which, despite existing only for use with this feature, is not really a good idea to use.

This indicates that the asm will write to or read from the contents of an address provided as an input argument. Note that in this way, indirect outputs act more like an input than an output: just like an input, they consume an argument of the call expression, rather than producing a return value. This is most typically used for memory constraint, e. It is also possible to use an indirect register constraint, but only on output e. This will cause LLVM to allocate a register for an output value normally, and then, separately emit a store to the address provided as input, after the provided inline asm.

I would recommend not using it. Call arguments for indirect constraints must have pointer type and must specify the elementtype attribute to indicate the pointer element type. A clobber does not consume an input operand, nor generate an output. Clobbers cannot use any of the general constraint code letters — they may use only explicit register constraints, e. Instead of consuming call arguments, label constraints consume indirect destination labels of callbr instructions.

Label constraints can only be used in conjunction with callbr and the number of label constraints must match the number of indirect destination labels in the callbr instruction. A Constraint Code is either a single letter e. A single constraint may include one or more than constraint code in it, leaving it up to LLVM to choose which one to use. This is included mainly for compatibility with the translation of GCC inline asm coming from clang.

There are two ways to specify alternatives, and either or both may be used in an inline asm constraint list:. Putting those together, you might have a two operand constraint string like "rm r,ri rm".

This indicates that if operand 0 is r or m , then operand 1 may be one of r or i. If operand 0 is r , then operand 1 may be one of r or m. But, operand 0 and 1 cannot both be of type m. However, the use of either of the alternatives features is NOT recommended, as LLVM is not able to make an intelligent choice about which one to use. At the point it currently needs to choose, not enough information is available to do so in a smart way.

And, if given multiple registers, or multiple register classes, it will simply choose the first one. The constraint codes are, in general, expected to behave the same way they do in GCC. A mismatch in behavior between LLVM and GCC likely indicates a bug in LLVM. The modifiers are, in general, expected to behave the same way they do in GCC. SystemZ implements only n , and does not support any of the other target-independent modifiers.

If present, the code generator will use the integer as the location cookie value when report errors through the LLVMContext error reporting mechanisms.

This allows a front-end to correlate backend errors that occur with inline asm back to the source code that produced it. It is up to the front-end to make sense of the magic numbers it places in the IR.

If the MDNode contains multiple constants, the code generator will use the one that corresponds to the line of the asm that the error occurs on. LLVM IR allows metadata to be attached to instructions and global objects in the program that can convey extra information about the code to the optimizers and code generator.

Registration would fail if the registration step was performed by a different connection. The --fido-register-factor option executes both the initiate and registration steps, which avoids the failure scenario described above and prevents having to execute the ALTER USER initiate and registration statements manually. The --fido-register-factor option is only available for the mysql client and MySQL Shell. Other MySQL client programs do not support it. For related information, see Using FIDO Authentication.

Request from the server the public key required for RSA key pair-based password exchange. For that plugin, the server does not send the public key unless requested.

This option is ignored for accounts that do not authenticate with that plugin. It is also ignored if RSA-based password exchange is not used, as is the case when the client connects to the server using a secure connection.

A list of one or more colon-separated patterns specifying statements to ignore for logging purposes. The value specified for this option affects logging of statements written to the history file, and to syslog if the --syslog option is given. Ignore spaces after function names. SQL statement to execute after connecting to the server.

If auto-reconnect is enabled, the statement is executed again after reconnection occurs. Write line numbers for errors. Disable this with --skip-line-numbers. This option affects the client-side LOCAL capability for LOAD DATA operations. It specifies the directory in which files named in LOAD DATA LOCAL statements must be located. The effect of --load-data-local-dir depends on whether LOCAL data loading is enabled or disabled:. When --load-data-local-dir applies, the option value designates the directory in which local data files must be located.

Comparison of the directory path name and the path name of files to be loaded is case-sensitive regardless of the case sensitivity of the underlying file system. If the option value is the empty string, it names no directory, with the result that no files are permitted for local data loading. When both --local-infile and --load-data-local-dir are given, the order in which they are given does not matter. Successful use of LOCAL load operations within mysql also requires that the server permits local loading; see Section 6.

The --load-data-local-dir option was added in MySQL 8. By default, LOCAL capability for LOAD DATA is determined by the default compiled into the MySQL client library. To enable or disable LOCAL data loading explicitly, use the --local-infile option. When given with no value, the option enables LOCAL data loading.

If LOCAL capability is disabled, the --load-data-local-dir option can be used to permit restricted local loading of files located in a designated directory. Read options from the named login path in the. cnf login path file. The default is 16MB, the maximum is 1GB. The automatic limit for rows in a join when using --safe-updates. Default value is 1,, Enable named mysql commands. Long-format commands are permitted, not just short-format commands. Use --skip-named-commands to disable named commands.

Default value is 16KB. If omitted, the connection uses the default global namespace. For information about network namespaces, see Section 5. This option was added in MySQL 8. It is available only on platforms that implement network namespace support. This has the same effect as --skip-auto-rehash. See the description for --auto-rehash. Do not read any option files.

If program startup fails due to reading unknown options from an option file, --no-defaults can be used to prevent them from being read. The exception is that the. cnf file is read in all cases, if it exists. This permits passwords to be specified in a safer way than on the command line even when --no-defaults is used. To create. Ignore statements except those that occur while the default database is the one named on the command line. This option is rudimentary and should be used with care.

Statement filtering is based only on USE statements. Then, for each USE statement encountered, mysql accepts or rejects following statements depending on whether the database named is the one on the command line.

The content of the statements is immaterial. Suppose that mysql is invoked to process this set of statements:. If the command line is mysql --force --one-database db1 , mysql handles the input as follows:.

The DELETE statement is executed because the default database is db1 , even though the statement names a table in a different database. The DROP TABLE and CREATE TABLE statements are not executed because the default database is not db1 , even though the statements name a table in db1. The INSERT and CREATE TABLE statements are executed because the default database is db1 , even though the CREATE TABLE statement names a table in a different database.

Use the given command for paging query output. If the command is omitted, the default pager is the value of your PAGER environment variable. This option works only on Unix and only in interactive mode. To disable paging, use --skip-pager. Section 4. The password of the MySQL account used for connecting to the server.

The password value is optional. If not given, mysql prompts for one. If no password option is specified, the default is to send no password. Specifying a password on the command line should be considered insecure.

To avoid giving the password on the command line, use an option file. To explicitly specify that there is no password and that mysql should not prompt for one, use the --skip-password option. The password for multifactor authentication factor 1 of the MySQL account used for connecting to the server.

To explicitly specify that there is no password and that mysql should not prompt for one, use the --skip-password1 option. The password for multifactor authentication factor 2 of the MySQL account used for connecting to the server.

The semantics of this option are similar to the semantics for --password1 ; see the description of that option for details. The password for multifactor authentication factor 3 of the MySQL account used for connecting to the server. On Windows, connect to the server using a named pipe. The directory in which to look for plugins. Specify this option if the --default-auth option is used to specify an authentication plugin but mysql does not find it. Set the prompt to the specified format. The special sequences that the prompt can contain are described in Section 4.

The transport protocol to use for connecting to the server. It is useful when the other connection parameters normally result in use of a protocol other than the one you want. For details on the permissible values, see Section 4. Do not cache each query result, print each row as it is received. This may slow down the server if the output is suspended. For nontabular output such as is produced in batch mode or when the --batch or --silent option is given , special characters are escaped in the output so they can be identified easily.

The --raw option disables this character escaping. The following example demonstrates tabular versus nontabular output and the use of raw mode to disable escaping:. If the connection to the server is lost, automatically try to reconnect. A single reconnect attempt is made each time the connection is lost. To suppress reconnection behavior, use --skip-reconnect. If this option is enabled, UPDATE and DELETE statements that do not use a key in the WHERE clause or a LIMIT clause produce an error.

In addition, restrictions are placed on SELECT statements that produce or are estimated to produce very large result sets. If you have set this option in an option file, you can use --skip-safe-updates on the command line to override it. For more information about this option, see Using Safe-Updates Mode --safe-updates. The automatic limit for SELECT statements when using --safe-updates. Default value is 1, The path name to a file in PEM format containing a client-side copy of the public key required by the server for RSA key pair-based password exchange.

This option is ignored for accounts that do not authenticate with one of those plugins. On Windows, the shared-memory name to use for connections made using shared memory to a local server. The default value is MYSQL. The shared-memory name is case-sensitive. Cause warnings to be shown after each statement if there are any.

This option applies to interactive and batch mode. Silent mode. Produce less output. This option can be given multiple times to produce less and less output. This option results in nontabular output format and escaping of special characters. Do not write line numbers for errors. Useful when you want to compare result files that include error messages.

For connections to localhost , the Unix socket file to use, or, on Windows, the name of the named pipe to use. Options that begin with --ssl specify whether to connect to the server using encryption and indicate where to find SSL keys and certificates. See Command Options for Encrypted Connections. Controls whether to enable FIPS mode on the client side.

The --ssl-fips-mode option differs from other --ssl- xxx options in that it is not used to establish encrypted connections, but rather to affect which cryptographic operations to permit. These --ssl-fips-mode values are permitted:. If the OpenSSL FIPS Object Module is not available, the only permitted value for --ssl-fips-mode is OFF. In this case, setting --ssl-fips-mode to ON or STRICT causes the client to produce a warning at startup and to operate in non-FIPS mode.

This option causes mysql to send interactive statements to the system logging facility. On Unix, this is syslog ; on Windows, it is the Windows Event Log. The destination where logged messages appear is system dependent. Here is a sample of output generated on Linux by using --syslog. This output is formatted for readability; each logged message actually takes a single line. Display output in table format. This is the default for interactive use, but can be used to produce table output in batch mode.

Append a copy of output to the given file. This option works only in interactive mode. The permissible ciphersuites for encrypted connections that use TLSv1. The value is a list of one or more colon-separated ciphersuite names. The ciphersuites that can be named for this option depend on the SSL library used to compile MySQL.

For details, see Section 6. The permissible TLS protocols for encrypted connections. The value is a list of one or more comma-separated protocol names. The protocols that can be named for this option depend on the SSL library used to compile MySQL. Verbose mode. Produce more output about what the program does. This option can be given multiple times to produce more and more output. For example, -v -v -v produces table output format even in batch mode.

Print query output rows vertically one line per column value. If the connection cannot be established, wait and retry instead of aborting. The output when --xml is used with mysql matches that of mysqldump --xml. The compression level to use for connections to the server that use the zstd compression algorithm.

The permitted levels are from 1 to 22, with larger values indicating increasing levels of compression. The default zstd compression level is 3. The compression level setting has no effect on connections that do not use zstd compression. Documentation Home MySQL 8. Using Options on the Command Line.

Command Reference. Installing Python Modules Legacy version. The setuptools project adds new capabilities to the setup function and other APIs, makes the API consistent across different Python versions, and is hence recommended over using distutils directly. html independently covers all of the relevant information currently included here. The distutils. core module is the only module that needs to be installed to use the Distutils.

It provides the setup which is called from the setup script. Indirectly provides the distutils. Distribution and distutils. Command class. The basic do-everything function that does most everything you could ever ask for from a Distutils method. The version number of the package; see distutils. The name of the current maintainer, if different from the author. Note that if the maintainer is provided, distutils will use it as the author in PKG-INFO. a list of instances of distutils.

a list of strings; valid classifiers are listed on PyPI. the Distribution class to use. a subclass of distutils. The name of the setup. py script - defaults to sys. Descriptive meta-data, see PEP A mapping of command names to Command subclasses. Run a setup script in a somewhat controlled environment, and return the distutils. Distribution instance that drives things.

This is useful if you need to find out the distribution meta-data passed as keyword args from script to setup , or the contents of the config files or command-line. argv[0] will be replaced with script for the duration of the call. Stop after the Distribution instance has been created and populated with the keyword arguments to setup. Stop after config files have been parsed and their data stored in the Distribution instance.

Stop after the command-line sys. Stop after all commands have been run the same as if setup had been called in the usual way. This is the default value. In addition, the distutils. core module exposed a number of classes that live elsewhere. Extension from distutils. Command from distutils. Distribution from distutils.

A short description of each of these follows, but see the relevant module for the full reference. It accepts the following keyword arguments in its constructor:. the full name of the extension, including any packages — ie.

not a filename or pathname, but Python dotted name. list of source filenames, relative to the distribution root where the setup script lives , in Unix form slash-separated for portability. list of macros to define; each macro is defined using a 2-tuple name, value , where value is either the string to define it to or None to define it without a particular value equivalent of define FOO in source or -DFOO on Unix C compiler command line.

list of extra files to link with eg. For platforms and compilers where a command line makes sense, this is typically a list of command-line arguments, but for other platforms it could be anything. any extra platform- and compiler-specific information to use when linking object files together to create the extension or to create a new static Python interpreter. list of symbols to be exported from a shared extension.

extension language i. Will be detected from the source extensions if not provided. specifies that a build failure in the extension should not abort the build process, but simply skip the extension. Changed in version 3. A Distribution describes how to build, install and package up a Python software package. See the setup function for a list of keyword arguments accepted by the Distribution constructor. setup creates a Distribution instance.

A Command class or rather, an instance of one of its subclasses implement a single distutils command. This module provides the abstract base class for the CCompiler classes. A CCompiler instance can be used for all the compile and link steps needed to build a single project.

Methods are provided to set options for the compiler — macro definitions, include directories, link path, libraries and the like. Generate linker options for searching library directories and linking with specific libraries. and search directories. Returns a list of command-line options suitable for use with some compiler depending on the two format strings passed in. macros is the usual thing, a list of 1- or 2-tuples, where name, means undefine -U macro name , and name, value means define -D macro name to value.

osname should be one of the standard Python OS names i. the ones returned by os. name and platform the common value returned by sys. platform for the platform in question. The default values are os. name and sys. platform in case the parameters are not given. plat defaults to os. name eg. The abstract base class CCompiler defines the interface that must be implemented by real compiler classes. The class also has some utility methods used by several compiler classes. Thus, attributes common to all of those compile and link steps — include directories, macros to define, libraries to link against, etc.

To allow for variability in how individual files are treated, most of those attributes may be varied on a per-compilation or per-link basis. The constructor for each subclass creates an instance of the Compiler object. All of these flags default to 0 off. The following methods allow you to manually alter compiler options for the instance of the Compiler class. Add dir to the list of directories that will be searched for header files.

Set the list of directories that will be searched to dirs a list of strings. This does not affect any list of standard include directories that the compiler may search by default. Add libname to the list of libraries that will be included in all links driven by this compiler object. It is perfectly valid to duplicate library names; the linker will be instructed to link against libraries as many times as they are mentioned.

Set the list of libraries to be included in all links driven by this compiler object to libnames a list of strings. This does not affect any standard system libraries that the linker may include by default. Set the list of library search directories to dirs a list of strings.

This does not affect any standard library search path that the linker may search by default. Add dir to the list of directories that will be searched for shared libraries at runtime. Set the list of directories to search for shared libraries at runtime to dirs a list of strings.

This does not affect any standard search path that the runtime linker may search by default. Define a preprocessor macro for all compilations driven by this compiler object. The optional parameter value should be a string; if it is not supplied, then the macro will be defined without an explicit value and the exact outcome depends on the compiler used.

Undefine a preprocessor macro for all compilations driven by this compiler object. in the call to compile , then that takes precedence. Set the list of object files or analogues to be included in every link to objects.

This does not affect any standard object files that the linker may include by default such as system libraries. The following methods implement methods for autodetection of compiler options, providing some functionality similar to GNU autoconf. Detect the language of a given file, or list of files. Search the specified list of directories for a static or shared library file lib and return the full path to that file.

If debug is true, look for a debugging version if that makes sense on the current platform.

The ciphersuites that can be named for this option depend on the SSL library used to compile MySQL. The metadata identifying each scope is also itself a list containing two or three entries. This attribute indicates that SafeStack protection is enabled for this function. Langganan Kompas. Deoptimization operand bundles do not capture their operands except during deoptimization, in which case control will not be returned to the compiled frame. Like read , multiple reads may be issued to the underlying raw stream, unless the latter is interactive. The BasicBlock class maintains a list of Instruction s, which form the body of the block.

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