/**
* This method updates the source attributes for all statements in a block. This is typically done
* in conjunction with a substitution, when we're inlining constraints from e.g. pre- and
* post-conditions.
*
* @param block
* @param nsrc
* @return
*/
public static Block resource(Block block, Attribute.Source nsrc) {
if (block == null) {
return null;
}
Block nblock = new Block(block.numInputs());
for (Entry e : block) {
nblock.append(e.code, nsrc);
}
return nblock;
}
public Block relabel() {
HashMap<String, String> labels = new HashMap<String, String>();
for (Entry s : this) {
if (s.code instanceof Code.Label) {
Code.Label l = (Code.Label) s.code;
labels.put(l.label, freshLabel());
}
}
Block block = new Block(numInputs);
// Finally, apply the binding and relabel any labels as well.
for (Entry s : this) {
Code ncode = s.code.relabel(labels);
block.append(ncode, s.attributes());
}
return block;
}
private Block readCodeBlock(int numInputs) throws IOException {
Block block = new Block(numInputs);
int nCodes = input.read_uv();
HashMap<Integer, Code.Label> labels = new HashMap<Integer, Code.Label>();
for (int i = 0; i != nCodes; ++i) {
Code code = readCode(i, labels);
block.append(code);
}
// NOTE: we must go up to nCodes+1 because of the possibility of a label
// occurring after the very last bytecode instruction.
for (int i = 0, j = 0; i != nCodes + 1; ++i, ++j) {
Code.Label label = labels.get(i);
if (label != null) {
block.insert(j++, label);
}
}
input.pad_u8(); // necessary
return block;
}
