Class AstLexicalWrite


  • public class AstLexicalWrite
    extends AstLexicalAccess
    A set of lexical writes. This instruction represents writes of a set of variables that are defined by a pair of variable name and defining code body (i.e. a method or function). This instruction has one local value number use for each lexical write, and the call graph builder ensures that these value numbers are kept consistent as lexical uses and definitions are discovered during call graph construction.
    • 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 i)
        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)
      • getDef

        public int getDef​(int i)
        Description copied from class: SSAInstruction
        Return the ith def
        Overrides:
        getDef in class SSAInstruction
        Parameters:
        i - number of the def, starting at 0.