ghc-7.0.3: The GHC API

Llvm

Contents

- Modules, Functions and Blocks
- Call Handling
- Operations and Comparisons
- Variables and Type System
  - Some basic types
  - Operations on the type system.
- Pretty Printing

Description

This module supplies bindings to generate Llvm IR from Haskell (http://www.llvm.org/docs/LangRef.html).

Note: this module is developed in a demand driven way. It is no complete LLVM binding library in Haskell, but enough to generate code for GHC.

This code is derived from code taken from the Essential Haskell Compiler (EHC) project (http://www.cs.uu.nl/wiki/Ehc/WebHome).

Synopsis

- data LlvmModule = LlvmModule {
  - modComments :: [LMString]
  - modAliases :: [LlvmAlias]
  - modGlobals :: [LMGlobal]
  - modFwdDecls :: LlvmFunctionDecls
  - modFuncs :: LlvmFunctions
  }
- data LlvmFunction = LlvmFunction {
  - funcDecl :: LlvmFunctionDecl
  - funcArgs :: [LMString]
  - funcAttrs :: [LlvmFuncAttr]
  - funcSect :: LMSection
  - funcBody :: LlvmBlocks
  }
- data LlvmFunctionDecl = LlvmFunctionDecl {
  - decName :: LMString
  - funcLinkage :: LlvmLinkageType
  - funcCc :: LlvmCallConvention
  - decReturnType :: LlvmType
  - decVarargs :: LlvmParameterListType
  - decParams :: [LlvmParameter]
  - funcAlign :: LMAlign
  }
- type LlvmFunctions = [LlvmFunction]
- type LlvmFunctionDecls = [LlvmFunctionDecl]
- data LlvmStatement
  - = Assignment LlvmVar LlvmExpression
  - | Branch LlvmVar
  - | BranchIf LlvmVar LlvmVar LlvmVar
  - | Comment [LMString]
  - | MkLabel LlvmBlockId
  - | Store LlvmVar LlvmVar
  - | Switch LlvmVar LlvmVar [(LlvmVar, LlvmVar)]
  - | Return (Maybe LlvmVar)
  - | Unreachable
  - | Expr LlvmExpression
- data LlvmExpression
  - = Alloca LlvmType Int
  - | LlvmOp LlvmMachOp LlvmVar LlvmVar
  - | Compare LlvmCmpOp LlvmVar LlvmVar
  - | Malloc LlvmType Int
  - | Load LlvmVar
  - | GetElemPtr Bool LlvmVar [LlvmVar]
  - | Cast LlvmCastOp LlvmVar LlvmType
  - | Call LlvmCallType LlvmVar [LlvmVar] [LlvmFuncAttr]
  - | Phi LlvmType [(LlvmVar, LlvmVar)]
  - | Asm LMString LMString LlvmType [LlvmVar] Bool Bool
- type LlvmBlocks = [LlvmBlock]
- data LlvmBlock = LlvmBlock {
  - blockLabel :: LlvmBlockId
  - blockStmts :: [LlvmStatement]
  }
- type LlvmBlockId = Unique
- data LlvmParamAttr
  - = ZeroExt
  - | SignExt
  - | InReg
  - | ByVal
  - | SRet
  - | NoAlias
  - | NoCapture
  - | Nest
- type LlvmParameter = (LlvmType, [LlvmParamAttr])
- data LlvmCallConvention
  - = CC_Ccc
  - | CC_Fastcc
  - | CC_Coldcc
  - | CC_Ncc Int
  - | CC_X86_Stdcc
- data LlvmCallType
  - = StdCall
  - | TailCall
- data LlvmParameterListType
  - = FixedArgs
  - | VarArgs
- data LlvmLinkageType
  - = Internal
  - | LinkOnce
  - | Weak
  - | Appending
  - | ExternWeak
  - | ExternallyVisible
  - | External
- data LlvmFuncAttr
  - = AlwaysInline
  - | InlineHint
  - | NoInline
  - | OptSize
  - | NoReturn
  - | NoUnwind
  - | ReadNone
  - | ReadOnly
  - | Ssp
  - | SspReq
  - | NoRedZone
  - | NoImplicitFloat
  - | Naked
- data LlvmCmpOp
  - = LM_CMP_Eq
  - | LM_CMP_Ne
  - | LM_CMP_Ugt
  - | LM_CMP_Uge
  - | LM_CMP_Ult
  - | LM_CMP_Ule
  - | LM_CMP_Sgt
  - | LM_CMP_Sge
  - | LM_CMP_Slt
  - | LM_CMP_Sle
  - | LM_CMP_Feq
  - | LM_CMP_Fne
  - | LM_CMP_Fgt
  - | LM_CMP_Fge
  - | LM_CMP_Flt
  - | LM_CMP_Fle
- data LlvmMachOp
  - = LM_MO_Add
  - | LM_MO_Sub
  - | LM_MO_Mul
  - | LM_MO_UDiv
  - | LM_MO_SDiv
  - | LM_MO_URem
  - | LM_MO_SRem
  - | LM_MO_FAdd
  - | LM_MO_FSub
  - | LM_MO_FMul
  - | LM_MO_FDiv
  - | LM_MO_FRem
  - | LM_MO_Shl
  - | LM_MO_LShr
  - | LM_MO_AShr
  - | LM_MO_And
  - | LM_MO_Or
  - | LM_MO_Xor
- data LlvmCastOp
  - = LM_Trunc
  - | LM_Zext
  - | LM_Sext
  - | LM_Fptrunc
  - | LM_Fpext
  - | LM_Fptoui
  - | LM_Fptosi
  - | LM_Uitofp
  - | LM_Sitofp
  - | LM_Ptrtoint
  - | LM_Inttoptr
  - | LM_Bitcast
- data LlvmVar
  - = LMGlobalVar LMString LlvmType LlvmLinkageType LMSection LMAlign LMConst
  - | LMLocalVar Unique LlvmType
  - | LMNLocalVar LMString LlvmType
  - | LMLitVar LlvmLit
- data LlvmStatic
  - = LMComment LMString
  - | LMStaticLit LlvmLit
  - | LMUninitType LlvmType
  - | LMStaticStr LMString LlvmType
  - | LMStaticArray [LlvmStatic] LlvmType
  - | LMStaticStruc [LlvmStatic] LlvmType
  - | LMStaticPointer LlvmVar
  - | LMBitc LlvmStatic LlvmType
  - | LMPtoI LlvmStatic LlvmType
  - | LMAdd LlvmStatic LlvmStatic
  - | LMSub LlvmStatic LlvmStatic
- data LlvmLit
  - = LMIntLit Integer LlvmType
  - | LMFloatLit Double LlvmType
  - | LMNullLit LlvmType
  - | LMUndefLit LlvmType
- data LlvmType
  - = LMInt Int
  - | LMFloat
  - | LMDouble
  - | LMFloat80
  - | LMFloat128
  - | LMPointer LlvmType
  - | LMArray Int LlvmType
  - | LMLabel
  - | LMVoid
  - | LMStruct [LlvmType]
  - | LMAlias LlvmAlias
  - | LMFunction LlvmFunctionDecl
- type LlvmAlias = (LMString, LlvmType)
- type LMGlobal = (LlvmVar, Maybe LlvmStatic)
- type LMString = FastString
- type LMSection = Maybe LMString
- type LMAlign = Maybe Int
- i64 :: LlvmType
- i32 :: LlvmType
- i16 :: LlvmType
- i8 :: LlvmType
- i1 :: LlvmType
- i8Ptr :: LlvmType
- llvmWord :: LlvmType
- llvmWordPtr :: LlvmType
- isGlobal :: LlvmVar -> Bool
- getLitType :: LlvmLit -> LlvmType
- getLit :: LlvmLit -> String
- getName :: LlvmVar -> String
- getPlainName :: LlvmVar -> String
- getVarType :: LlvmVar -> LlvmType
- getLink :: LlvmVar -> LlvmLinkageType
- getStatType :: LlvmStatic -> LlvmType
- getGlobalVar :: LMGlobal -> LlvmVar
- getGlobalType :: LMGlobal -> LlvmType
- pVarLift :: LlvmVar -> LlvmVar
- pVarLower :: LlvmVar -> LlvmVar
- pLift :: LlvmType -> LlvmType
- pLower :: LlvmType -> LlvmType
- isInt :: LlvmType -> Bool
- isFloat :: LlvmType -> Bool
- isPointer :: LlvmType -> Bool
- llvmWidthInBits :: LlvmType -> Int
- ppLlvmModule :: LlvmModule -> Doc
- ppLlvmComments :: [LMString] -> Doc
- ppLlvmComment :: LMString -> Doc
- ppLlvmGlobals :: [LMGlobal] -> Doc
- ppLlvmGlobal :: LMGlobal -> Doc
- ppLlvmFunctionDecls :: LlvmFunctionDecls -> Doc
- ppLlvmFunctionDecl :: LlvmFunctionDecl -> Doc
- ppLlvmFunctions :: LlvmFunctions -> Doc
- ppLlvmFunction :: LlvmFunction -> Doc
- ppLlvmAlias :: LlvmAlias -> Doc
- ppLlvmAliases :: [LlvmAlias] -> Doc
- llvmSDoc :: SDoc -> Doc

# Modules, Functions and Blocks

data LlvmModule

An LLVM Module. This is a top level container in LLVM.

Constructors

LlvmModule |

Fields

modComments :: [LMString]

  Comments to include at the start of the module.

modAliases :: [LlvmAlias]

  LLVM Alias type definitions.

modGlobals :: [LMGlobal]

  Global variables to include in the module.

modFwdDecls :: LlvmFunctionDecls

  LLVM Functions used in this module but defined in other modules.

modFuncs :: LlvmFunctions

  LLVM Functions defined in this module.

data LlvmFunction

An LLVM Function

Constructors

LlvmFunction |

Fields

funcDecl :: LlvmFunctionDecl

  The signature of this declared function.

funcArgs :: [LMString]

  The functions arguments

funcAttrs :: [LlvmFuncAttr]

  The function attributes.

funcSect :: LMSection

  The section to put the function into,

funcBody :: LlvmBlocks

  The body of the functions.

data LlvmFunctionDecl

An LLVM Function

Constructors

LlvmFunctionDecl |

Fields

decName :: LMString

  Unique identifier of the function

funcLinkage :: LlvmLinkageType

  LinkageType of the function

funcCc :: LlvmCallConvention

  The calling convention of the function

decReturnType :: LlvmType

  Type of the returned value

decVarargs :: LlvmParameterListType

  Indicates if this function uses varargs

decParams :: [LlvmParameter]

  Parameter types and attributes

funcAlign :: LMAlign

  Function align value, must be power of 2

Instances

Eq LlvmFunctionDecl |
Show LlvmFunctionDecl |

type LlvmFunctions = [LlvmFunction]

type LlvmFunctionDecls = [LlvmFunctionDecl]

data LlvmStatement

Llvm Statements

Constructors

Assignment LlvmVar LlvmExpression | Assign an expression to an variable: * dest: Variable to assign to * source: Source expression
Branch LlvmVar | Always branch to the target label
BranchIf LlvmVar LlvmVar LlvmVar | Branch to label targetTrue if cond is true otherwise to label targetFalse * cond: condition that will be tested, must be of type i1 * targetTrue: label to branch to if cond is true * targetFalse: label to branch to if cond is false
Comment [LMString] | Comment Plain comment.
MkLabel LlvmBlockId | Set a label on this position. * name: Identifier of this label, unique for this module
Store LlvmVar LlvmVar | Store variable value in pointer ptr. If value is of type t then ptr must be of type t*. * value: Variable/Constant to store. * ptr: Location to store the value in
Switch LlvmVar LlvmVar [(LlvmVar, LlvmVar)] | Mutliway branch * scrutinee: Variable or constant which must be of integer type that is determines which arm is chosen. * def: The default label if there is no match in target. * target: A list of (value,label) where the value is an integer constant and label the corresponding label to jump to if the scrutinee matches the value.
Return (Maybe LlvmVar) | Return a result. * result: The variable or constant to return
Unreachable | An instruction for the optimizer that the code following is not reachable
Expr LlvmExpression | Raise an expression to a statement (if don't want result or want to use Llvm unnamed values.

Instances

Eq LlvmStatement |
Show LlvmStatement |

data LlvmExpression

Llvm Expressions

Constructors

Alloca LlvmType Int | Allocate amount * sizeof(tp) bytes on the stack * tp: LlvmType to reserve room for * amount: The nr of tp's which must be allocated
LlvmOp LlvmMachOp LlvmVar LlvmVar | Perform the machine operator op on the operands left and right * op: operator * left: left operand * right: right operand
Compare LlvmCmpOp LlvmVar LlvmVar | Perform a compare operation on the operands left and right * op: operator * left: left operand * right: right operand
Malloc LlvmType Int | Allocate amount * sizeof(tp) bytes on the heap * tp: LlvmType to reserve room for * amount: The nr of tp's which must be allocated
Load LlvmVar | Load the value at location ptr
GetElemPtr Bool LlvmVar [LlvmVar] | Navigate in an structure, selecting elements * inbound: Is the pointer inbounds? (computed pointer doesn't overflow) * ptr: Location of the structure * indexes: A list of indexes to select the correct value.
Cast LlvmCastOp LlvmVar LlvmType | Cast the variable from to the to type. This is an abstraction of three cast operators in Llvm, inttoptr, prttoint and bitcast. * cast: Cast type * from: Variable to cast * to: type to cast to

Call LlvmCallType LlvmVar [LlvmVar] [LlvmFuncAttr]

Call a function. The result is the value of the expression. * tailJumps: CallType to signal if the function should be tail called * fnptrval: An LLVM value containing a pointer to a function to be invoked. Can be indirect. Should be LMFunction type. * args: Concrete arguments for the parameters * attrs: A list of function attributes for the call. Only NoReturn, NoUnwind, ReadOnly and ReadNone are valid here.

Phi LlvmType [(LlvmVar, LlvmVar)] | Merge variables from different basic blocks which are predecessors of this basic block in a new variable of type tp. * tp: type of the merged variable, must match the types of the predecessor variables. * precessors: A list of variables and the basic block that they originate from.

Asm LMString LMString LlvmType [LlvmVar] Bool Bool

Inline assembly expression. Syntax is very similar to the style used by GCC. * assembly: Actual inline assembly code. * contraints: Operand constraints. * return ty: Return type of function. * vars: Any variables involved in the assembly code. * sideeffect: Does the expression have side effects not visible from the constraints list. * alignstack: Should the stack be conservatively aligned before this expression is executed.

Instances

Eq LlvmExpression |
Show LlvmExpression |

type LlvmBlocks = [LlvmBlock]

data LlvmBlock

A block of LLVM code.

Constructors

LlvmBlock |

Fields

blockLabel :: LlvmBlockId

  The code label for this block

blockStmts :: [LlvmStatement]

  A list of LlvmStatement's representing the code for this block. This list must end with a control flow statement.

type LlvmBlockId = Unique

Block labels

data LlvmParamAttr

LLVM Parameter Attributes.

Parameter attributes are used to communicate additional information about the result or parameters of a function

Constructors

ZeroExt | This indicates to the code generator that the parameter or return value should be zero-extended to a 32-bit value by the caller (for a parameter) or the callee (for a return value).
SignExt | This indicates to the code generator that the parameter or return value should be sign-extended to a 32-bit value by the caller (for a parameter) or the callee (for a return value).
InReg | This indicates that this parameter or return value should be treated in a special target-dependent fashion during while emitting code for a function call or return (usually, by putting it in a register as opposed to memory).
ByVal | This indicates that the pointer parameter should really be passed by value to the function.
SRet | This indicates that the pointer parameter specifies the address of a structure that is the return value of the function in the source program.
NoAlias | This indicates that the pointer does not alias any global or any other parameter.
NoCapture | This indicates that the callee does not make any copies of the pointer that outlive the callee itself
Nest | This indicates that the pointer parameter can be excised using the trampoline intrinsics.

Instances

Eq LlvmParamAttr |
Show LlvmParamAttr |

type LlvmParameter = (LlvmType, [LlvmParamAttr])

# Call Handling

data LlvmCallConvention

Different calling conventions a function can use.

Constructors

CC_Ccc | The C calling convention. This calling convention (the default if no other calling convention is specified) matches the target C calling conventions. This calling convention supports varargs function calls and tolerates some mismatch in the declared prototype and implemented declaration of the function (as does normal C).

CC_Fastcc

This calling convention attempts to make calls as fast as possible (e.g. by passing things in registers). This calling convention allows the target to use whatever tricks it wants to produce fast code for the target, without having to conform to an externally specified ABI (Application Binary Interface). Implementations of this convention should allow arbitrary tail call optimization to be supported. This calling convention does not support varargs and requires the prototype of al callees to exactly match the prototype of the function definition.

CC_Coldcc

This calling convention attempts to make code in the caller as efficient as possible under the assumption that the call is not commonly executed. As such, these calls often preserve all registers so that the call does not break any live ranges in the caller side. This calling convention does not support varargs and requires the prototype of all callees to exactly match the prototype of the function definition.

CC_Ncc Int | Any calling convention may be specified by number, allowing target-specific calling conventions to be used. Target specific calling conventions start at 64.
CC_X86_Stdcc | X86 Specific `StdCall` convention. LLVM includes a specific alias for it rather than just using CC_Ncc.

Instances

Eq LlvmCallConvention |
Show LlvmCallConvention |

data LlvmCallType

Different types to call a function.

Constructors

StdCall | Normal call, allocate a new stack frame.
TailCall | Tail call, perform the call in the current stack frame.

Instances

Eq LlvmCallType |
Show LlvmCallType |

data LlvmParameterListType

Functions can have a fixed amount of parameters, or a variable amount.

Constructors

FixedArgs |
VarArgs |

Instances

Eq LlvmParameterListType |
Show LlvmParameterListType |

data LlvmLinkageType

Linkage type of a symbol.

The description of the constructors is copied from the Llvm Assembly Language Reference Manual http://www.llvm.org/docs/LangRef.html#linkage, because they correspond to the Llvm linkage types.

Constructors

Internal | Global values with internal linkage are only directly accessible by objects in the current module. In particular, linking code into a module with an internal global value may cause the internal to be renamed as necessary to avoid collisions. Because the symbol is internal to the module, all references can be updated. This corresponds to the notion of the `static` keyword in C.
LinkOnce | Globals with `linkonce` linkage are merged with other globals of the same name when linkage occurs. This is typically used to implement inline functions, templates, or other code which must be generated in each translation unit that uses it. Unreferenced linkonce globals are allowed to be discarded.
Weak | `weak` linkage is exactly the same as linkonce linkage, except that unreferenced weak globals may not be discarded. This is used for globals that may be emitted in multiple translation units, but that are not guaranteed to be emitted into every translation unit that uses them. One example of this are common globals in C, such as `int X;` at global scope.
Appending | `appending` linkage may only be applied to global variables of pointer to array type. When two global variables with appending linkage are linked together, the two global arrays are appended together. This is the Llvm, typesafe, equivalent of having the system linker append together `sections` with identical names when .o files are linked.
ExternWeak | The semantics of this linkage follow the ELF model: the symbol is weak until linked, if not linked, the symbol becomes null instead of being an undefined reference.
ExternallyVisible | The symbol participates in linkage and can be used to resolve external symbol references.
External | Alias for `ExternallyVisible` but with explicit textual form in LLVM assembly.

Instances

Eq LlvmLinkageType |
Show LlvmLinkageType |

data LlvmFuncAttr

Llvm Function Attributes.

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 parameter attributes can have the same function type. Functions can have multiple attributes.

Descriptions taken from http://llvm.org/docs/LangRef.html#fnattrs

Constructors

AlwaysInline | This attribute indicates that the inliner should attempt to inline this function into callers whenever possible, ignoring any active inlining size threshold for this caller.
InlineHint | This attribute indicates that the source code contained a hint that inlining this function is desirable (such as the "inline" keyword in C/C++). It is just a hint; it imposes no requirements on the inliner.
NoInline | This attribute indicates that the inliner should never inline this function in any situation. This attribute may not be used together with the alwaysinline attribute.
OptSize | This attribute suggests that optimization passes and code generator passes make choices that keep the code size of this function low, and otherwise do optimizations specifically to reduce code size.
NoReturn | This function attribute indicates that the function never returns normally. This produces undefined behavior at runtime if the function ever does dynamically return.
NoUnwind | This function attribute indicates that the function never returns with an unwind or exceptional control flow. If the function does unwind, its runtime behavior is undefined.

ReadNone

This attribute indicates that the function computes its result (or decides to unwind an exception) based strictly on its arguments, without dereferencing any pointer arguments or otherwise accessing any mutable state (e.g. memory, control registers, etc) visible to caller functions. It does not write through any pointer arguments (including byval arguments) and never changes any state visible to callers. This means that it cannot unwind exceptions by calling the C++ exception throwing methods, but could use the unwind instruction.

ReadOnly

This attribute indicates that the function does not write through any pointer arguments (including byval arguments) or otherwise modify any state (e.g. memory, control registers, etc) visible to caller functions. It may dereference pointer arguments and read state that may be set in the caller. A readonly function always returns the same value (or unwinds an exception identically) when called with the same set of arguments and global state. It cannot unwind an exception by calling the C++ exception throwing methods, but may use the unwind instruction.

Ssp

This attribute indicates that the function should emit a stack smashing protector. It is in the form of a "canary"a random value placed on the stack before the local variables that's checked upon return from the function to see if it has been overwritten. A heuristic is used to determine if a function needs stack protectors or not.

If a function that has an ssp attribute is inlined into a function that doesn't have an ssp attribute, then the resulting function will have an ssp attribute.

SspReq | This attribute indicates that the function should always emit a stack smashing protector. This overrides the ssp function attribute. If a function that has an sspreq attribute is inlined into a function that doesn't have an sspreq attribute or which has an ssp attribute, then the resulting function will have an sspreq attribute.
NoRedZone | This attribute indicates that the code generator should not use a red zone, even if the target-specific ABI normally permits it.
NoImplicitFloat | This attributes disables implicit floating point instructions.
Naked | This attribute disables prologue / epilogue emission for the function. This can have very system-specific consequences.

Instances

Eq LlvmFuncAttr |
Show LlvmFuncAttr |

# Operations and Comparisons

data LlvmCmpOp

Llvm compare operations.

Constructors

LM_CMP_Eq | Equal (Signed and Unsigned)
LM_CMP_Ne | Not equal (Signed and Unsigned)
LM_CMP_Ugt | Unsigned greater than
LM_CMP_Uge | Unsigned greater than or equal
LM_CMP_Ult | Unsigned less than
LM_CMP_Ule | Unsigned less than or equal
LM_CMP_Sgt | Signed greater than
LM_CMP_Sge | Signed greater than or equal
LM_CMP_Slt | Signed less than
LM_CMP_Sle | Signed less than or equal
LM_CMP_Feq | Float equal
LM_CMP_Fne | Float not equal
LM_CMP_Fgt | Float greater than
LM_CMP_Fge | Float greater than or equal
LM_CMP_Flt | Float less than
LM_CMP_Fle | Float less than or equal

Instances

Eq LlvmCmpOp |
Show LlvmCmpOp |

data LlvmMachOp

Llvm binary operators machine operations.

Constructors

LM_MO_Add | add two integer, floating point or vector values.
LM_MO_Sub | subtract two ...
LM_MO_Mul | multiply ..
LM_MO_UDiv | unsigned integer or vector division.
LM_MO_SDiv | signed integer ..
LM_MO_URem | unsigned integer or vector remainder (mod)
LM_MO_SRem | signed ...
LM_MO_FAdd | add two floating point or vector values.
LM_MO_FSub | subtract two ...
LM_MO_FMul | multiply ...
LM_MO_FDiv | divide ...
LM_MO_FRem | remainder ...
LM_MO_Shl | Left shift
LM_MO_LShr | Logical shift right Shift right, filling with zero
LM_MO_AShr | Arithmetic shift right The most significant bits of the result will be equal to the sign bit of the left operand.
LM_MO_And | AND bitwise logical operation.
LM_MO_Or | OR bitwise logical operation.
LM_MO_Xor | XOR bitwise logical operation.

Instances

Eq LlvmMachOp |
Show LlvmMachOp |

data LlvmCastOp

Llvm cast operations.

Constructors

LM_Trunc | Integer truncate
LM_Zext | Integer extend (zero fill)
LM_Sext | Integer extend (sign fill)
LM_Fptrunc | Float truncate
LM_Fpext | Float extend
LM_Fptoui | Float to unsigned Integer
LM_Fptosi | Float to signed Integer
LM_Uitofp | Unsigned Integer to Float
LM_Sitofp | Signed Int to Float
LM_Ptrtoint | Pointer to Integer
LM_Inttoptr | Integer to Pointer
LM_Bitcast | Cast between types where no bit manipulation is needed

Instances

Eq LlvmCastOp |
Show LlvmCastOp |

# Variables and Type System

data LlvmVar

Llvm Variables

Constructors

LMGlobalVar LMString LlvmType LlvmLinkageType LMSection LMAlign LMConst | Variables with a global scope.
LMLocalVar Unique LlvmType | Variables local to a function or parameters.
LMNLocalVar LMString LlvmType | Named local variables. Sometimes we need to be able to explicitly name variables (e.g for function arguments).
LMLitVar LlvmLit | A constant variable

Instances

Eq LlvmVar |
Show LlvmVar |

data LlvmStatic

Llvm Static Data.

These represent the possible global level variables and constants.

Constructors

LMComment LMString | A comment in a static section
LMStaticLit LlvmLit | A static variant of a literal value
LMUninitType LlvmType | For uninitialised data
LMStaticStr LMString LlvmType | Defines a static `LMString`
LMStaticArray [LlvmStatic] LlvmType | A static array
LMStaticStruc [LlvmStatic] LlvmType | A static structure type
LMStaticPointer LlvmVar | A pointer to other data
LMBitc LlvmStatic LlvmType | Pointer to Pointer conversion
LMPtoI LlvmStatic LlvmType | Pointer to Integer conversion
LMAdd LlvmStatic LlvmStatic | Constant addition operation
LMSub LlvmStatic LlvmStatic | Constant subtraction operation

Instances

Show LlvmStatic |

data LlvmLit

Llvm Literal Data.

These can be used inline in expressions.

Constructors

LMIntLit Integer LlvmType | Refers to an integer constant (i64 42).
LMFloatLit Double LlvmType | Floating point literal
LMNullLit LlvmType | Literal NULL, only applicable to pointer types
LMUndefLit LlvmType | Undefined value, random bit pattern. Useful for optimisations.

Instances

Eq LlvmLit |
Show LlvmLit |

data LlvmType

Llvm Types

Constructors

LMInt Int | An integer with a given width in bits.
LMFloat | 32 bit floating point
LMDouble | 64 bit floating point
LMFloat80 | 80 bit (x86 only) floating point
LMFloat128 | 128 bit floating point
LMPointer LlvmType | A pointer to a `LlvmType`
LMArray Int LlvmType | An array of `LlvmType`
LMLabel | A `LlvmVar` can represent a label (address)
LMVoid | Void type
LMStruct [LlvmType] | Structure type
LMAlias LlvmAlias | A type alias
LMFunction LlvmFunctionDecl | Function type, used to create pointers to functions

Instances

Eq LlvmType |
Show LlvmType |

type LlvmAlias = (LMString, LlvmType)

A type alias

type LMGlobal = (LlvmVar, Maybe LlvmStatic)

A global mutable variable. Maybe defined or external

type LMString = FastString

A String in LLVM

type LMSection = Maybe LMString

An LLVM section definition. If Nothing then let LLVM decide the section

type LMAlign = Maybe Int

## Some basic types

i64 :: LlvmType

i32 :: LlvmType

i16 :: LlvmType

i8 :: LlvmType

i1 :: LlvmType

i8Ptr :: LlvmType

llvmWord :: LlvmType

llvmWordPtr :: LlvmType

The target architectures word size

## Operations on the type system.

isGlobal :: LlvmVar -> Bool

Test if a `LlvmVar` is global.

getLitType :: LlvmLit -> LlvmType

Return the `LlvmType` of a `LlvmLit`

getLit :: LlvmLit -> String

Print a literal value. No type.

getName :: LlvmVar -> String

Return the variable name or value of the `LlvmVar` in Llvm IR textual representation (e.g. `@x`, `%y` or `42`).

getPlainName :: LlvmVar -> String

Return the variable name or value of the `LlvmVar` in a plain textual representation (e.g. `x`, `y` or `42`).

getVarType :: LlvmVar -> LlvmType

Return the `LlvmType` of the `LlvmVar`

getLink :: LlvmVar -> LlvmLinkageType

Return the `LlvmLinkageType` for a `LlvmVar`

getStatType :: LlvmStatic -> LlvmType

Return the `LlvmType` of the `LlvmStatic`

getGlobalVar :: LMGlobal -> LlvmVar

Return the `LlvmVar` part of a `LMGlobal`

getGlobalType :: LMGlobal -> LlvmType

Return the `LlvmType` of the `LMGlobal`

pVarLift :: LlvmVar -> LlvmVar

Lower a variable of `LMPointer` type.

pVarLower :: LlvmVar -> LlvmVar

Lower a variable of `LMPointer` type.

pLift :: LlvmType -> LlvmType

Add a pointer indirection to the supplied type. `LMLabel` and `LMVoid` cannot be lifted.

pLower :: LlvmType -> LlvmType

Remove the pointer indirection of the supplied type. Only `LMPointer` constructors can be lowered.

isInt :: LlvmType -> Bool

Test if the given `LlvmType` is an integer

isFloat :: LlvmType -> Bool

Test if the given `LlvmType` is a floating point type

isPointer :: LlvmType -> Bool

Test if the given `LlvmType` is an `LMPointer` construct

llvmWidthInBits :: LlvmType -> Int

Width in bits of an `LlvmType`, returns 0 if not applicable

# Pretty Printing

ppLlvmModule :: LlvmModule -> Doc

Print out a whole LLVM module.

ppLlvmComments :: [LMString] -> Doc

Print out a multi-line comment, can be inside a function or on its own

ppLlvmComment :: LMString -> Doc

Print out a comment, can be inside a function or on its own

ppLlvmGlobals :: [LMGlobal] -> Doc

Print out a list of global mutable variable definitions

ppLlvmGlobal :: LMGlobal -> Doc

Print out a global mutable variable definition

ppLlvmFunctionDecls :: LlvmFunctionDecls -> Doc

Print out a list of function declaration.

ppLlvmFunctionDecl :: LlvmFunctionDecl -> Doc

Print out a function declaration. Declarations define the function type but don't define the actual body of the function.

ppLlvmFunctions :: LlvmFunctions -> Doc

Print out a list of function definitions.

ppLlvmFunction :: LlvmFunction -> Doc

Print out a function definition.

ppLlvmAlias :: LlvmAlias -> Doc

Print out an LLVM type alias.

ppLlvmAliases :: [LlvmAlias] -> Doc

Print out a list of LLVM type aliases.

llvmSDoc :: SDoc -> Doc

Convert SDoc to Doc