some opt

midend/llvm/value/IrBasicBlock.java

@@ -35,6 +35,27 @@ public class IrBasicBlock extends IrValue {
         instr.setBBlock(this);
     }
 
+    public void addInstr(IrInstr instr, int index) {
+        instrs.add(index, instr);
+        instr.setBBlock(this);
+    }
+
+    public void deleteInstr(IrInstr instr) {
+        instrs.remove(instr);
+        instr.setBBlock(null);
+        instr.clearUses();
+        instr.clearUsers();
+    }
+
+    public void clearAllInstrs() {
+        for (IrInstr instr : instrs) {
+            instr.setBBlock(null);
+            instr.clearUses();
+            instr.clearUsers();
+        }
+        instrs.clear();
+    }
+
     public IrFuncValue getFunc() {
         return func;
     }
@@ -87,6 +108,20 @@ public class IrBasicBlock extends IrValue {
         return instrs;
     }
 
+    public IrInstr getFirstInstr() {
+        if (instrs.isEmpty()) {
+            return null;
+        }
+        return instrs.get(0);
+    }
+
+    public IrInstr getLastInstr() {
+        if (instrs.isEmpty()) {
+            return null;
+        }
+        return instrs.get(instrs.size() - 1);
+    }
+
     public void addPred(IrBasicBlock bb) {
         this.preds.add(bb);
     }
@@ -119,6 +154,14 @@ public class IrBasicBlock extends IrValue {
         return this.directDomi;
     }
 
+    public HashSet<IrBasicBlock> getDirectDomies() {
+        return directDomies;
+    }
+
+    public HashSet<IrBasicBlock> getDomiFrontier() {
+        return domiFrontier;
+    }
+
     public void toMips() {
         new MipsLabel(getMipsLabel());
         for (IrInstr instr : instrs) {

midend/llvm/value/IrFuncValue.java

@@ -45,6 +45,27 @@ public class IrFuncValue extends IrValue {
         bblocks.add(bblock);
     }
 
+    public void deleteBBlock(IrBasicBlock bblock) {
+        bblocks.remove(bblock);
+        bblock.clearAllInstrs();
+    }
+
+    public void deleteDeadBlock() {
+        ArrayList<IrBasicBlock> liveBlocks = new ArrayList<>();
+        ArrayList<IrBasicBlock> deadBlocks = new ArrayList<>();
+        for (IrBasicBlock bb : bblocks) {
+            if (!bb.getPreds().isEmpty() || bb.isEntry()) {
+                liveBlocks.add(bb);
+            } else {
+                deadBlocks.add(bb);
+            }
+        }
+        bblocks = liveBlocks;
+        for (IrBasicBlock bb : deadBlocks) {
+            bb.clearAllInstrs();
+        }
+    }
+
     public Register getRegister(IrValue value) {
         return valueRegisterMap.get(value);
     }

midend/llvm/value/IrValue.java

@@ -32,6 +32,28 @@ public class IrValue {
         users.add(user);
     }
 
+    public void deleteUser(IrUser user) {
+        users.remove(user);
+    }
+
+    public void clearUsers() {
+        ArrayList<IrUser> usersCopy = new ArrayList<>(users);
+        for (IrUser user : usersCopy) {
+            user.deleteUse(this);
+        }
+    }
+
+    public void replaceUserToAnother(IrValue newValue) {
+        ArrayList<IrUser> usersCopy = new ArrayList<>(users);
+        for (IrUser user : usersCopy) {
+            for (int i = 0; i < user.getUses().size(); i++) {
+                if (user.getUse(i) == this) {
+                    user.setUse(i, newValue);
+                }
+            }
+        }
+    }
+
     public String toString() {
         return type.toString() + " " + name;
     }