/**
* Update the value graph to account for a given NullCheck instruction.
*
* <p><b>PRECONDITION:</b> <code> ZeroCheck.conforms(s); </code>
*
* @param s the instruction in question
*/
private void processZeroCheck(Instruction s) {
// label the vertex corresponding to the result with the operator
RegisterOperand result = ZeroCheck.getGuardResult(s);
ValueGraphVertex v = findOrCreateVertex(result.getRegister());
v.setLabel(s.operator(), 1);
// link node v to the operand it uses
Operand val = ZeroCheck.getValue(s);
// bypass Move instructions
val = bypassMoves(val);
link(v, findOrCreateVertex(val), 0);
}
/**
* Update the value graph to account for a given instruction.
*
* @param s the instruction in question
*/
private void processInstruction(Instruction s) {
// TODO: support all necessary types of instructions
if (s.isDynamicLinkingPoint()) {
processCall(s);
} else if (Move.conforms(s)) {
processMove(s);
} else if (s.operator == PI) {
processPi(s);
} else if (New.conforms(s)) {
processNew(s);
} else if (NewArray.conforms(s)) {
processNewArray(s);
} else if (Unary.conforms(s)) {
processUnary(s);
} else if (GuardedUnary.conforms(s)) {
processGuardedUnary(s);
} else if (NullCheck.conforms(s)) {
processNullCheck(s);
} else if (ZeroCheck.conforms(s)) {
processZeroCheck(s);
} else if (Binary.conforms(s)) {
processBinary(s);
} else if (GuardedBinary.conforms(s)) {
processGuardedBinary(s);
} else if (InlineGuard.conforms(s)) {
processInlineGuard(s);
} else if (IfCmp.conforms(s)) {
processIfCmp(s);
} else if (Call.conforms(s)) {
processCall(s);
} else if (MonitorOp.conforms(s)) {
processCall(s);
} else if (Prepare.conforms(s)) {
processCall(s);
} else if (Attempt.conforms(s)) {
processCall(s);
} else if (CacheOp.conforms(s)) {
processCall(s);
} else if (ALoad.conforms(s)) {
processALoad(s);
} else if (PutField.conforms(s)) {
processPutField(s);
} else if (PutStatic.conforms(s)) {
processPutStatic(s);
} else if (AStore.conforms(s)) {
processAStore(s);
} else if (Phi.conforms(s)) {
processPhi(s);
} else if (s.operator() == IR_PROLOGUE) {
processPrologue(s);
}
}