Examples with Constant com.android.dx.rop.cst.Constant used on opensource projects

Example 91 with Constant

use of com.android.dx.rop.cst.Constant in project J2ME-Loader by nikita36078.

the class SCCP method simulatePhi.

/**
 * Simulates a PHI node and set the lattice for the result
 * to the appropriate value.
 * Meet values:
 * TOP x anything = TOP
 * VARYING x anything = VARYING
 * CONSTANT x CONSTANT = CONSTANT if equal constants, VARYING otherwise
 * @param insn PHI to simulate.
 */
private void simulatePhi(PhiInsn insn) {
    int phiResultReg = insn.getResult().getReg();
    if (latticeValues[phiResultReg] == VARYING) {
        return;
    }
    RegisterSpecList sources = insn.getSources();
    int phiResultValue = TOP;
    Constant phiConstant = null;
    int sourceSize = sources.size();
    for (int i = 0; i < sourceSize; i++) {
        int predBlockIndex = insn.predBlockIndexForSourcesIndex(i);
        int sourceReg = sources.get(i).getReg();
        int sourceRegValue = latticeValues[sourceReg];
        if (!executableBlocks.get(predBlockIndex)) {
            continue;
        }
        if (sourceRegValue == CONSTANT) {
            if (phiConstant == null) {
                phiConstant = latticeConstants[sourceReg];
                phiResultValue = CONSTANT;
            } else if (!latticeConstants[sourceReg].equals(phiConstant)) {
                phiResultValue = VARYING;
                break;
            }
        } else {
            phiResultValue = sourceRegValue;
            break;
        }
    }
    if (setLatticeValueTo(phiResultReg, phiResultValue, phiConstant)) {
        addUsersToWorklist(phiResultReg, phiResultValue);
    }
}