GHC.Wasm.ControlFlow

Documentation

data WasmControl :: Type -> Type -> [WasmType] -> [WasmType] -> Type where

Representation of WebAssembly control flow. Normally written as WasmControl s e pre post Type parameter s is the type of (unspecified) statements. It might be instantiated with an open Cmm block or with a sequence of Wasm instructions. Parameter e is the type of expressions. Parameter pre represents the values that are expected on the WebAssembly stack when the code runs, and post represents the state of the stack on completion.

Constructors

WasmPush :: WasmTypeTag t -> e -> WasmControl s e stack (t : stack)

WasmBlock :: WasmFunctionType pre post -> WasmControl s e pre post -> WasmControl s e pre post

WasmLoop :: WasmFunctionType pre post -> WasmControl s e pre post -> WasmControl s e pre post

WasmIfTop :: WasmFunctionType pre post -> WasmControl s e pre post -> WasmControl s e pre post -> WasmControl s e ('I32 : pre) post

WasmBr :: Int -> WasmControl s e dropped destination

WasmFallthrough :: WasmControl s e dropped destination

WasmBrTable :: e -> BrTableInterval -> [Int] -> Int -> WasmControl s e dropped destination

WasmTailCall :: e -> WasmControl s e t1star t2star

WasmActions :: s -> WasmControl s e stack stack

WasmSeq :: WasmControl s e pre mid -> WasmControl s e mid post -> WasmControl s e pre post

(<>) :: forall s e pre mid post. WasmControl s e pre mid -> WasmControl s e mid post -> WasmControl s e pre post

pattern WasmIf :: WasmFunctionType pre post -> e -> WasmControl s e pre post -> WasmControl s e pre post -> WasmControl s e pre post

data BrTableInterval

Constructors

BrTableInterval

Fields

• bti_lo :: Integer
• bti_count :: Integer

Instances

Show BrTableInterval

Defined in GHC.CmmToAsm.Wasm.Types

Methods

showsPrec :: Int -> BrTableInterval -> ShowS

show :: BrTableInterval -> String

showList :: [BrTableInterval] -> ShowS

Outputable BrTableInterval

Defined in GHC.CmmToAsm.Wasm.Types

Methods

ppr :: BrTableInterval -> SDoc

inclusiveInterval :: Integer -> Integer -> BrTableInterval

Module : GHC.Wasm.ControlFlow Description : Representation of control-flow portion of the WebAssembly instruction set

data WasmType

WebAssembly type of a WebAssembly value that WebAssembly code could either expect on the evaluation stack or leave on the evaluation stack.

Instances

TestEquality WasmTypeTag

Defined in GHC.CmmToAsm.Wasm.Types

Methods

testEquality :: forall (a :: k) (b :: k). WasmTypeTag a -> WasmTypeTag b -> Maybe (a :~: b)

data WasmTypeTag :: WasmType -> Type where

Singleton type useful for programming with WasmType at the type level.

Constructors

TagI32 :: WasmTypeTag 'I32

TagI64 :: WasmTypeTag 'I64

TagF32 :: WasmTypeTag 'F32

TagF64 :: WasmTypeTag 'F64

Instances

TestEquality WasmTypeTag

Defined in GHC.CmmToAsm.Wasm.Types

Methods

testEquality :: forall (a :: k) (b :: k). WasmTypeTag a -> WasmTypeTag b -> Maybe (a :~: b)

Show (WasmTypeTag t)

Defined in GHC.CmmToAsm.Wasm.Types

Methods

showsPrec :: Int -> WasmTypeTag t -> ShowS

show :: WasmTypeTag t -> String

showList :: [WasmTypeTag t] -> ShowS

data TypeList :: [WasmType] -> Type where

List of WebAssembly types used to describe the sequence of WebAssembly values that a block of code may expect on the stack or leave on the stack.

Constructors

TypeListNil :: TypeList '[]

TypeListCons :: WasmTypeTag t -> TypeList ts -> TypeList (t : ts)

data WasmFunctionType pre post

The type of a WebAssembly function, loop, block, or conditional. This type says what values the code expects to pop off the stack and what values it promises to push. The WebAssembly standard requires that this type appear explicitly in the code.

Constructors

WasmFunctionType

Fields

• ft_pops :: TypeList pre
• ft_pushes :: TypeList post