/** Returns a new, optimized code info structure. */
public CodeInfo getCodeInfo() {
CodeInfo codeInfo;
codeInfo =
new CodeInfo(
buildInstructionArray(), handlers, buildLineNumberInfo(), buildLocalVariableInfo());
// replace instruction handles by actual instructions
try {
AccessorTransformer transformer =
new AccessorTransformer() {
public InstructionAccessor transform(
InstructionAccessor accessor, AccessorContainer container) {
// the only accessors to resolve are instruction handles
return ((InstructionHandle) accessor).getInstruction();
}
};
codeInfo.transformAccessors(transformer);
} catch (BadAccessorException e) {
throw new InconsistencyException(e.getMessage()); // !!!!
}
return codeInfo;
}
/** Install handles around instructions. */
private InstructionHandle installInstructionHandles(CodeInfo info) {
Instruction[] insns = info.getInstructions();
InstructionHandle[] handles = new InstructionHandle[insns.length];
for (int i = 0; i < handles.length; i++) {
// this also sets the field next in handles
handles[i] = new InstructionHandle(insns[i], i == 0 ? null : handles[i - 1]);
}
try {
info.transformAccessors(new HandleCreator(insns, handles));
} catch (BadAccessorException e) {
// !!!DEBUG
dumpCode(insns);
// !!!DEBUG
throw new InconsistencyException(e.getMessage()); // !!!!
}
return handles[0];
}
/**
* Construct the control flow graph with the information code of a method.
*
* @param methodInfo informations on the method
* @param info informations on the method code
*/
public ControlFlowGraph(MethodInfo methodInfo, CodeInfo info) {
this.info = info;
graph = new Graph();
subroutines = new HashMap();
findBasicBlocks();
generateQInsts(info.getInstructions(), methodInfo);
constructSSAForm();
optimize();
if (DEBUG) {
for (BasicBlock bb = firstBB; bb != null; bb = bb.getNext()) {
System.out.println("\n" + bb);
Iterator insts = bb.getAllSSAInstructions();
while (insts.hasNext()) {
QInst inst = (QInst) insts.next();
System.out.println(inst);
}
}
}
}
/** Constructs a new optimizer object. */
public Optimizer(CodeInfo codeInfo) {
setCodeStart(installInstructionHandles(codeInfo));
this.handlers = codeInfo.getHandlers();
this.localVariables = codeInfo.getLocalVariables();
}
