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This document is a reference manual for the LLVM assembly language. It is the common code representation used throughout all phases of the LLVM compilation strategy. The LLVM code representation is deed to be used in three different forms: as an in-memory compiler IR, as an on-disk bitcode representation suitable for fast loading nu,bers a Just-In-Time compilerand as a human readable assembly language representation.
This allows LLVM to provide a powerful intermediate representation for efficient compiler transformations and analysis, while providing a natural means to debug and visualize the transformations.
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The three different forms of LLVM are all equivalent. This document describes the human readable representation and notation. The LLVM representation aims to be light-weight and low-level while being expressive, typed, and extensible at the same time. By providing type information, LLVM can be used as the target of optimizations: for example, through pointer analysis, it can be proven that a C automatic variable is never accessed outside of the current function, allowing it to be promoted to a simple SSA value instead of a memory location.
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For example, the following instruction is syntactically okay, but not well formed:. This pass is automatically run by the parser after parsing input assembly and by the optimizer before it outputs bitcode. The violations pointed out by the verifier pass indicate bugs in transformation passes or input to the parser. LLVM identifiers come in two basic types: number and local.
Global identifiers functions, global variables begin sext the ' ' character. Additionally, there are three different formats for identifiers, for different purposes:. Additionally, unnamed identifiers allow a compiler jumbers quickly come up with a temporary variable without having to avoid symbol table conflicts. Reserved words in LLVM are very similar to reserved words in other languages.
It also shows a convention that we follow in this document. When demonstrating numbers, we will follow an instruction with a comment that defines the type and name of value produced. Each module consists of functions, global variables, and symbol table entries.
Modules may be combined together with the LLVM linker, which merges function and global variable definitions, resolves forward declarations, and merges symbol table entries. In general, a module is made up of a list of global values where both functions and global variables are global values. Global values are represented by a pointer to a memory location in this case, a pointer to an array of char, and a pointer to a functionand have one of the following linkage types.
When two xext variables with appending linkage are linked together, the two global arrays are appended together. LLVM functionscalls and invokes can all have an optional calling convention specified for the call. The following calling conventions are supported by LLVM, and more may be added in the future:. It passes everything in registers, going to extremes to achieve this by disabling callee save registers.
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This calling convention should not be used lightly but only for specific situations such as an alternative to the register pinning performance technique often used number implementing functional programming languages. At the moment only X86 supports this convention and it has the following limitations:. This calling convention supports tail call optimization but requires both the caller and sext are using it.
This calling convention attempts to make the code in the caller as unintrusive as possible. This alleviates the burden of saving and recovering a large register set before and after the call in the caller. If the arguments are passed in callee-saved registers, then they will be preserved by the callee across the call. The idea behind this convention is to support calls to runtime functions that have a hot path and a cold path.
This calling convention will be used by a future version of the ObjectiveC runtime and should therefore still be considered experimental at this time. Although this convention was created to optimize certain runtime calls to the ObjectiveC runtime, it is not limited sxet this runtime and might be used by other runtimes numbfrs the future too. The current implementation only supports X, but the intention is to support more architectures in the future.
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This calling convention attempts to make the code in the caller even less intrusive than the PreserveMost calling convention. Sest removes the burden of saving and recovering a large register set before and after the call in the caller.
This calling convention, like the PreserveMost calling convention, will be used by a future version of the ObjectiveC runtime and should be considered experimental at this time. The access function generally has an entry block, an exit block and an initialization block that is run at the first time. The entry and exit blocks can access a few TLS IR variables, each access will be lowered to a platform-specific sequence.
This calling convention sext to minimize overhead in the number by preserving as many registers as possible all the registers that are preserved on the fast path, composed of the entry and exit blocks.
This calling convention sezt used for the Control Flow Guard check function, calls to which can be inserted before indirect calls to check that the call target is a valid function address. The check function has no return value, but it will trigger an OS-level error if the address is not a valid target. The set of registers preserved by the check function, and the register containing the target address are architecture-specific. A symbol with internal or private linkage must have default visibility.
Not all targets support thread-local variables.
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Optionally, a TLS model may be specified:. The target may choose a different TLS model if the specified model is not supported, or if a better choice of model can be made. A model can also be specified in an alias, but then it only governs how the alias is accessed. It will not have any effect in the aliasee. Global variables, nummbers and aliases may have an optional runtime preemption specifier.
Literal types are uniqued structurally, but identified types are never uniqued. An number structural type can also be used to forward declare a type that is not yet available. Prior to the LLVM 3. Only literal types are uniqued in recent versions of LLVM. Note: non-integral pointer types are a work in progress, and they should be considered experimental at this time. sext
Non-integral pointer types represent pointers that have an unspecified bitwise representation; that nubmers, the integral representation may be target dependent or unstable not backed by a fixed integer. Vector versions of said instructions are ill-typed as well. Global variables can optionally specify a linkage type. Either global variable definitions or declarations may have an explicit section to be placed in and may have an optional explicit alignment specified.
If there is a number between the explicit or inferred section information for the variable declaration and its definition the resulting behavior is undefined. A variable may be defined as a global constantwhich indicates that the contents of the variable will never be modified enabling better optimization, allowing the global data to be placed in the read-only section of an executable, zext.
Note that variables that need runtime initialization cannot be marked constant as nubmers is a store to the variable. LLVM explicitly allows declarations of global variables to be marked constant, even if the final definition of the global is not. As SSA values, global variables define pointer values that are sext scope i. Constants marked like this can be merged with other constants if they have the same initializer.
A global variable may be declared to reside in a target-specific ed address nukbers. The default address space is zero. The address space qualifier must precede any other attributes. LLVM allows an explicit section to be specified for globals. If the target sex it, it will emit globals to the section specified. Additionally, the global can placed in a comdat if the target has numbegs necessary support.
External declarations may have an explicit section specified. Attaching section information to an external declaration is an assertion that its definition is located in the specified section.
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If the definition is located in a different section, the behavior is undefined. By default, global initializers are optimized by assuming that global variables defined within the module are not modified from their initial values before the start of the global initializer. This is true even for variables potentially accessible from outside the module, including those with external linkage or appearing in llvm. An explicit alignment may be specified for a global, which must be a power of 2.
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If not present, or if the alignment is set to zero, the alignment of the global is set by bumbers target to whatever it feels convenient. If an explicit alignment is specified, the global is forced to have exactly that alignment. Targets and optimizers are nunbers allowed to over-align the global if the global has an ased section. In this case, the extra alignment could be observable: for example, code could assume that the globals are densely packed in their section sext try to iterate over them as an array, alignment padding would break this iteration.
The alignment of a global variable declaration or replaceable definition must not be greater than the alignment of the definition it resolves to. Globals can also have a DLL storage classan optional runtime preemption specifieran optional global attributes and an optional list of attached metadata. Variables and aliases can have a Thread Local Storage Model.
Scalable vectors cannot be global variables or members of structs or arrays because their size is unknown at compile time. For example, the following defines a global in a ed address space with an initializer, section, and alignment:. The following example defines a thread-local global number the initialexec TLS model:.
Each basic block may optionally start with a label giving the basic block a symbol table entrycontains a list of instructions, and ends with a terminator instruction such as a branch or function return. If an explicit label name is not provided, a block is ased an implicit ed label, using the next value from the same counter as used for unnamed temporaries see above.
If a numeric label is sext specified, it must match the numeric label that would be used implicitly. The first basic block in a function is number in two ways: it is immediately executed on entrance to the function, and it is not allowed to have predecessor basic blocks i. Because the block can have no predecessors, it also cannot have any PHI nodes.
LLVM allows an explicit section to be specified for functions. If the target supports it, it will emit functions to the section specified. An explicit alignment may be specified for a function. If not present, or if the alignment is set to zero, the alignment of the function is set by the target to whatever it feels convenient. If an explicit alignment is specified, the function is forced to have at least that much alignment.