ghc-9.2.0.20210331: The GHC API
Safe HaskellSafe-Inferred
LanguageHaskell2010

GHC.Cmm.Node

Contents

Synopsis

Documentation

data CmmNode e x where Source #

Constructors

CmmEntry :: !Label -> CmmTickScope -> CmmNode C O 
CmmComment :: FastString -> CmmNode O O 
CmmTick :: !CmmTickish -> CmmNode O O 
CmmUnwind :: [(GlobalReg, Maybe CmmExpr)] -> CmmNode O O 
CmmAssign :: !CmmReg -> !CmmExpr -> CmmNode O O 
CmmStore :: !CmmExpr -> !CmmExpr -> CmmNode O O 
CmmUnsafeForeignCall :: ForeignTarget -> [CmmFormal] -> [CmmActual] -> CmmNode O O 
CmmBranch :: !Label -> CmmNode O C 
CmmCondBranch 

Fields

CmmSwitch :: CmmExpr -> SwitchTargets -> CmmNode O C 
CmmCall 

Fields

CmmForeignCall 

Fields

Instances

Instances details
NonLocal CmmNode # 
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Defined in GHC.Cmm.Node

Methods

entryLabel :: forall (x :: Extensibility). CmmNode C x -> Label Source #

successors :: forall (e :: Extensibility). CmmNode e C -> [Label] Source #

OutputableP Platform CmmGraph # 
Instance details

Defined in GHC.Cmm.Ppr

Methods

pdoc :: Platform -> CmmGraph -> SDoc Source #

DefinerOfRegs GlobalReg (CmmNode e x) # 
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Defined in GHC.Cmm.Node

Methods

foldRegsDefd :: Platform -> (b -> GlobalReg -> b) -> b -> CmmNode e x -> b Source #

DefinerOfRegs LocalReg (CmmNode e x) # 
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Defined in GHC.Cmm.Node

Methods

foldRegsDefd :: Platform -> (b -> LocalReg -> b) -> b -> CmmNode e x -> b Source #

UserOfRegs GlobalReg (CmmNode e x) # 
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Defined in GHC.Cmm.Node

Methods

foldRegsUsed :: Platform -> (b -> GlobalReg -> b) -> b -> CmmNode e x -> b Source #

UserOfRegs LocalReg (CmmNode e x) # 
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Defined in GHC.Cmm.Node

Methods

foldRegsUsed :: Platform -> (b -> LocalReg -> b) -> b -> CmmNode e x -> b Source #

OutputableP Platform (CmmNode e x) # 
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Defined in GHC.Cmm.Ppr

Methods

pdoc :: Platform -> CmmNode e x -> SDoc Source #

OutputableP Platform (Block CmmNode C C) # 
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Defined in GHC.Cmm.Ppr

OutputableP Platform (Block CmmNode C O) # 
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Defined in GHC.Cmm.Ppr

OutputableP Platform (Block CmmNode O C) # 
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Defined in GHC.Cmm.Ppr

OutputableP Platform (Block CmmNode O O) # 
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Defined in GHC.Cmm.Ppr

OutputableP Platform (Graph CmmNode e x) # 
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Defined in GHC.Cmm.Ppr

Methods

pdoc :: Platform -> Graph CmmNode e x -> SDoc Source #

Eq (CmmNode e x) # 
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Defined in GHC.Cmm.Node

Methods

(==) :: CmmNode e x -> CmmNode e x -> Bool #

(/=) :: CmmNode e x -> CmmNode e x -> Bool #

type CmmTickish = GenTickish 'TickishPassCmm Source #

Tickish in Cmm context (annotations only)

data Convention Source #

A convention maps a list of values (function arguments or return values) to registers or stack locations.

Constructors

NativeDirectCall

top-level Haskell functions use NativeDirectCall, which maps arguments to registers starting with R2, according to how many registers are available on the platform. This convention ignores R1, because for a top-level function call the function closure is implicit, and doesn't need to be passed.

NativeNodeCall

non-top-level Haskell functions, which pass the address of the function closure in R1 (regardless of whether R1 is a real register or not), and the rest of the arguments in registers or on the stack.

NativeReturn

a native return. The convention for returns depends on how many values are returned: for just one value returned, the appropriate register is used (R1, F1, etc.). regardless of whether it is a real register or not. For multiple values returned, they are mapped to registers or the stack.

Slow

Slow entry points: all args pushed on the stack

GC

Entry to the garbage collector: uses the node reg! (TODO: I don't think we need this --SDM)

Instances

Instances details
Outputable Convention # 
Instance details

Defined in GHC.Cmm.Ppr

Methods

ppr :: Convention -> SDoc Source #

Eq Convention # 
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Defined in GHC.Cmm.Node

data ForeignTarget Source #

Instances

Instances details
Eq ForeignTarget # 
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Defined in GHC.Cmm.Node

(Ord r, UserOfRegs r CmmReg) => UserOfRegs r ForeignTarget # 
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Defined in GHC.Cmm.Node

Methods

foldRegsUsed :: Platform -> (b -> r -> b) -> b -> ForeignTarget -> b Source #

OutputableP Platform ForeignTarget # 
Instance details

Defined in GHC.Cmm.Ppr

data CmmReturnInfo Source #

Instances

Instances details
Outputable CmmReturnInfo # 
Instance details

Defined in GHC.Cmm.Ppr

Eq CmmReturnInfo # 
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Defined in GHC.Cmm.Node

mapExp :: (CmmExpr -> CmmExpr) -> CmmNode e x -> CmmNode e x Source #

foldExp :: (CmmExpr -> z -> z) -> CmmNode e x -> z -> z Source #

foldExpDeep :: (CmmExpr -> z -> z) -> CmmNode e x -> z -> z Source #

wrapRecExpf :: (CmmExpr -> z -> z) -> CmmExpr -> z -> z Source #

mapCollectSuccessors :: forall a. (Label -> (Label, a)) -> CmmNode O C -> (CmmNode O C, [a]) Source #

Tick scopes

data CmmTickScope Source #

Tick scope identifier, allowing us to reason about what annotations in a Cmm block should scope over. We especially take care to allow optimisations to reorganise blocks without losing tick association in the process.

Constructors

GlobalScope

The global scope is the "root" of the scope graph. Every scope is a sub-scope of the global scope. It doesn't make sense to add ticks to this scope. On the other hand, this means that setting this scope on a block means no ticks apply to it.

SubScope !Unique CmmTickScope

Constructs a new sub-scope to an existing scope. This allows us to translate Core-style scoping rules (see tickishScoped) into the Cmm world. Suppose the following code:

tick1 case ... of A -> tick2 ... B -> tick3 ...

We want the top-level tick annotation to apply to blocks generated for the A and B alternatives. We can achieve that by generating tick1 into a block with scope a, while the code for alternatives A and B gets generated into sub-scopes a/b and a/c respectively.

CombinedScope CmmTickScope CmmTickScope

A combined scope scopes over everything that the two given scopes cover. It is therefore a sub-scope of either scope. This is required for optimisations. Consider common block elimination:

A -> tick2 case ... of C -> [common] B -> tick3 case ... of D -> [common]

We will generate code for the C and D alternatives, and figure out afterwards that it's actually common code. Scoping rules dictate that the resulting common block needs to be covered by both tick2 and tick3, therefore we need to construct a scope that is a child to *both* scope. Now we can do that - if we assign the scopes ac and bd to the common-ed up blocks, the new block could have a combined tick scope ac+bd, which both tick2 and tick3 apply to.

isTickSubScope :: CmmTickScope -> CmmTickScope -> Bool Source #

Checks whether two tick scopes are sub-scopes of each other. True if the two scopes are equal.

combineTickScopes :: CmmTickScope -> CmmTickScope -> CmmTickScope Source #

Combine two tick scopes. The new scope should be sub-scope of both parameters. We simplify automatically if one tick scope is a sub-scope of the other already.