import PprMach
import AbsCStixGen ( genCodeAbstractC )
-import AbsCSyn ( AbstractC )
+import AbsCSyn ( AbstractC, MagicId(..) )
import AbsCUtils ( mkAbsCStmtList, magicIdPrimRep )
import AsmRegAlloc ( runRegAllocate )
import MachOp ( MachOp(..), isCommutableMachOp, isComparisonMachOp )
-> StAssignReg pk reg (stixExpr_ConFold src)
StAssignReg pk reg@(StixMagicId mid) src
-- Replace register leaves with appropriate StixTrees for
- -- the given target.
- -> case get_MagicId_reg_or_addr mid of
- Left realreg
- -> StAssignReg pk reg (stixExpr_ConFold src)
- Right baseRegAddr
- -> stixStmt_ConFold
- (StAssignMem pk baseRegAddr src)
+ -- the given target. MagicIds which map to a reg on this arch are left unchanged.
+ -- Assigning to BaseReg is always illegal, so we check for that.
+ -> case mid of {
+ BaseReg -> panic "stixStmt_ConFold: assignment to BaseReg";
+ other ->
+ case get_MagicId_reg_or_addr mid of
+ Left realreg
+ -> StAssignReg pk reg (stixExpr_ConFold src)
+ Right baseRegAddr
+ -> stixStmt_ConFold (StAssignMem pk baseRegAddr src)
+ }
StAssignMem pk addr src
-> StAssignMem pk (stixExpr_ConFold addr) (stixExpr_ConFold src)
StVoidable expr
-> stixMachOpFold mop (map stixExpr_ConFold args)
StReg (StixMagicId mid)
-- Replace register leaves with appropriate StixTrees for
- -- the given target.
+ -- the given target. MagicIds which map to a reg on this arch are left unchanged.
+ -- For the rest, BaseReg is taken to mean the address of the reg table
+ -- in MainCapability, and for all others we generate an indirection to
+ -- its location in the register table.
-> case get_MagicId_reg_or_addr mid of
Left realreg -> expr
Right baseRegAddr
- -> stixExpr_ConFold (StInd (magicIdPrimRep mid) baseRegAddr)
+ -> case mid of
+ BaseReg -> stixExpr_ConFold baseRegAddr
+ other -> stixExpr_ConFold (StInd (magicIdPrimRep mid) baseRegAddr)
other
-> other
\end{code}