private static void shrinkBlock(MethodNode mth, BlockNode block) {
if (block.getInstructions().isEmpty()) {
return;
}
InsnList insnList = new InsnList(block.getInstructions());
int insnCount = insnList.size();
List<ArgsInfo> argsList = new ArrayList<ArgsInfo>(insnCount);
for (int i = 0; i < insnCount; i++) {
argsList.add(new ArgsInfo(insnList.get(i), argsList, i));
}
List<WrapInfo> wrapList = new ArrayList<WrapInfo>();
for (ArgsInfo argsInfo : argsList) {
List<RegisterArg> args = argsInfo.getArgs();
if (args.isEmpty()) {
continue;
}
ListIterator<RegisterArg> it = args.listIterator(args.size());
while (it.hasPrevious()) {
RegisterArg arg = it.previous();
// if (arg.getName() != null) {
// continue;
// }
SSAVar sVar = arg.getSVar();
// allow inline only one use arg or 'this'
if (sVar.getVariableUseCount() != 1 && !arg.isThis()) {
continue;
}
InsnNode assignInsn = sVar.getAssign().getParentInsn();
if (assignInsn == null || assignInsn.contains(AFlag.DONT_INLINE)) {
continue;
}
int assignPos = insnList.getIndex(assignInsn);
if (assignPos != -1) {
WrapInfo wrapInfo = argsInfo.checkInline(assignPos, arg);
if (wrapInfo != null) {
wrapList.add(wrapInfo);
}
} else {
// another block
BlockNode assignBlock = BlockUtils.getBlockByInsn(mth, assignInsn);
if (assignBlock != null
&& assignInsn != arg.getParentInsn()
&& canMoveBetweenBlocks(assignInsn, assignBlock, block, argsInfo.getInsn())) {
arg.wrapInstruction(assignInsn);
InsnList.remove(assignBlock, assignInsn);
}
}
}
}
if (!wrapList.isEmpty()) {
for (WrapInfo wrapInfo : wrapList) {
wrapInfo.getArg().wrapInstruction(wrapInfo.getInsn());
}
for (WrapInfo wrapInfo : wrapList) {
insnList.remove(wrapInfo.getInsn());
}
}
}