/**
* Look up a BasicBlock by its unique label.
*
* @param blockLabel the label of a BasicBlock
* @return the BasicBlock with the given label, or null if there is no such BasicBlock
*/
public BasicBlock lookupBlockByLabel(int blockLabel) {
for (Iterator<BasicBlock> i = blockIterator(); i.hasNext(); ) {
BasicBlock basicBlock = i.next();
if (basicBlock.getLabel() == blockLabel) {
return basicBlock;
}
}
return null;
}
/**
* Get Collection of basic blocks whose IDs are specified by given BitSet.
*
* @param labelSet BitSet of block labels
* @return a Collection containing the blocks whose IDs are given
*/
public Collection<BasicBlock> getBlocks(BitSet labelSet) {
LinkedList<BasicBlock> result = new LinkedList<BasicBlock>();
for (Iterator<BasicBlock> i = blockIterator(); i.hasNext(); ) {
BasicBlock block = i.next();
if (labelSet.get(block.getLabel())) {
result.add(block);
}
}
return result;
}
public void checkIntegrity() {
// Ensure that basic blocks have only consecutive instructions
for (Iterator<BasicBlock> i = blockIterator(); i.hasNext(); ) {
BasicBlock basicBlock = i.next();
InstructionHandle prev = null;
for (Iterator<InstructionHandle> j = basicBlock.instructionIterator(); j.hasNext(); ) {
InstructionHandle handle = j.next();
if (prev != null && prev.getNext() != handle) {
throw new IllegalStateException(
"Non-consecutive instructions in block "
+ basicBlock.getLabel()
+ ": prev="
+ prev
+ ", handle="
+ handle);
}
prev = handle;
}
}
}
/**
* Gets the register set associated with the start of the given block. This is just convenient
* shorthand for <code>getStarts(block.getLabel())</code>.
*
* @param block non-null; the block in question
* @return non-null; the associated register set
*/
public RegisterSpecSet getStarts(BasicBlock block) {
return getStarts(block.getLabel());
}