CmmBrokenBlock

brokenBlockId :: BlockId	The block's label like a `CmmBasicBlock`
brokenBlockEntry :: BlockEntryInfo	Ways this block can be entered
brokenBlockStmts :: [CmmStmt]	Body like a CmmBasicBlock (but without the last statement)
brokenBlockTargets :: [BlockId]	Blocks that this block could branch to either by conditional branches or via the last statement
brokenBlockExit :: FinalStmt	The final statement of the block

data BlockEntryInfo

How a block could be entered See Note [An example of CPS conversion]

Constructors

FunctionEntry CmmInfo CLabel CmmFormalsWithoutKinds	Block is the beginning of a function, parameters are: 1. Function header info 2. The function name 3. Aguments to function Only the formal parameters are live
ContinuationEntry CmmFormalsWithoutKinds C_SRT Bool	Return point of a function call, parameters are: 1. return values (argument to continuation) 2. SRT for the continuation's info table 3. True = GC block so ignore stack size Live variables, other than the return values, are on the stack
ControlEntry	Any other kind of block. Only entered due to control flow.

data FinalStmt

Final statement in a BlokenBlock. Constructors and arguments match those in Cmm, but are restricted to branches, returns, jumps, calls and switches

Constructors

FinalBranch BlockId	Same as `CmmBranch`. Target must be a ControlEntry
FinalReturn CmmActuals	Same as `CmmReturn`. Parameter is the return values.
FinalJump CmmExpr CmmActuals	Same as `CmmJump`. Parameters: 1. The function to call, 2. Arguments of the call
FinalCall BlockId CmmCallTarget CmmFormals CmmActuals C_SRT CmmReturnInfo Bool	Same as `CmmCallee` followed by CmmGoto. Parameters: 1. Target of the CmmGoto (must be a `ContinuationEntry`) 2. The function to call 3. Results from call (redundant with ContinuationEntry) 4. Arguments to call 5. SRT for the continuation's info table 6. Does the function return? 7. True = GC block so ignore stack size
FinalSwitch CmmExpr [Maybe BlockId]	Same as a `CmmSwitch`. Paremeters: 1. Scrutinee (zero based) 2. Targets

breakBlock

:: [BlockId]	Any GC blocks that should be special
-> [Unique]	An infinite list of uniques to create names of the new blocks with
-> CmmBasicBlock	Input block to break apart
-> BlockEntryInfo	Info for the first created `BrokenBlock`
-> ([(BlockId, ContFormat)], [BrokenBlock])
Takes a `CmmBasicBlock` and breaks it up into a list of `BrokenBlock` by splitting on each `CmmCall` in the `CmmBasicBlock`.

cmmBlockFromBrokenBlock :: BrokenBlock -> CmmBasicBlock

Convert from a BrokenBlock back to an equivalent CmmBasicBlock Needed by liveness analysis

blocksToBlockEnv :: [BrokenBlock] -> BlockEnv BrokenBlock

Build a mapping so we can lookup a BrokenBlock by its BlockId

adaptBlockToFormat :: [(BlockId, ContFormat)] -> Unique -> BrokenBlock -> [BrokenBlock]

selectContinuations :: [(BlockId, ContFormat)] -> [(BlockId, ContFormat)]

data ContFormat

Instances

makeContinuationEntries

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