/**
* Determines whether this block is guaranteed to begin executing before the given block does.
*/
boolean provablyExecutesBefore(BasicBlock thatBlock) {
// If thatBlock is a descendant of this block, and there are no hoisted
// blocks between them, then this block must start before thatBlock.
BasicBlock currentBlock;
for (currentBlock = thatBlock;
currentBlock != null && currentBlock != this;
currentBlock = currentBlock.getParent()) {}
if (currentBlock == this) {
return true;
}
return isGlobalScopeBlock() && thatBlock.isGlobalScopeBlock();
}
/** @return Whether the variable is only assigned a value once for its lifetime. */
boolean isAssignedOnceInLifetime() {
Reference ref = getOneAndOnlyAssignment();
if (ref == null) {
return false;
}
// Make sure this assignment is not in a loop.
for (BasicBlock block = ref.getBasicBlock(); block != null; block = block.getParent()) {
if (block.isFunction) {
if (ref.getSymbol().getScope() != ref.scope) {
return false;
}
break;
} else if (block.isLoop) {
return false;
}
}
return true;
}