Class SSASwitchInstruction


  • public class SSASwitchInstruction
    extends SSAInstruction
    SSA instruction representing a switch statement.
    • Constructor Detail

      • SSASwitchInstruction

        public SSASwitchInstruction​(int iindex,
                                    int val,
                                    int defaultLabel,
                                    int[] casesAndLabels)
        The labels in casesAndLabels represent instruction indices in the IR that each switch case branches to.
    • Method Detail

      • copyForSSA

        public SSAInstruction copyForSSA​(SSAInstructionFactory insts,
                                         int[] defs,
                                         int[] uses)
        Description copied from class: SSAInstruction
        This method is meant to be used during SSA conversion for an IR that is not in SSA form. It creates a new SSAInstruction of the same type as the receiver, with a combination of the receiver's uses and defs and those from the method parameters. In particular, if the 'defs' parameter is null, then the new instruction has the same defs as the receiver. If 'defs' is not null, it must be an array with a size equal to the number of defs that the receiver instruction has. In this case, the new instruction has defs taken from the array. The uses of the new instruction work in the same way with the 'uses' parameter. Note that this only applies to CAst-based IR translation, since Java bytecode-based IR generation uses a different SSA construction mechanism. TODO: move this into the SSAInstructionFactory
        Specified by:
        copyForSSA in class SSAInstruction
      • getUse

        public int getUse​(int j)
        Overrides:
        getUse in class SSAInstruction
        Returns:
        value number representing the jth use in this instruction. -1 means TOP (i.e., the value doesn't matter)
        See Also:
        SSAInstruction.getUse(int)
      • getTarget

        public int getTarget​(int caseValue)
      • getDefault

        public int getDefault()
      • getCasesAndLabels

        public int[] getCasesAndLabels()
      • isFallThrough

        public boolean isFallThrough()
        Specified by:
        isFallThrough in class SSAInstruction
        Returns:
        true iff this instruction may fall through to the next