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A Java Optimization Framework
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package soot.jimple;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2003 Ondrej Lhotak
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import soot.ArrayType;
import soot.Local;
import soot.RefType;
import soot.Value;

public abstract class PointerStmtSwitch extends AbstractStmtSwitch {
  Stmt statement;

  /** A statement of the form l = constant; */
  protected abstract void caseAssignConstStmt(Value dest, Constant c);

  /** A statement of the form l = v; */
  protected abstract void caseCopyStmt(Local dest, Local src);

  /** A statement of the form l = (cl) v; */
  protected void caseCastStmt(Local dest, Local src, CastExpr c) {
    // default is to just ignore the cast
    caseCopyStmt(dest, src);
  }

  /** An identity statement assigning a parameter to a local. */
  protected abstract void caseIdentityStmt(Local dest, IdentityRef src);

  /** A statement of the form l1 = l2.f; */
  protected abstract void caseLoadStmt(Local dest, InstanceFieldRef src);

  /** A statement of the form l1.f = l2; */
  protected abstract void caseStoreStmt(InstanceFieldRef dest, Local src);

  /** A statement of the form l1 = l2[i]; */
  protected abstract void caseArrayLoadStmt(Local dest, ArrayRef src);

  /** A statement of the form l1[i] = l2; */
  protected abstract void caseArrayStoreStmt(ArrayRef dest, Local src);

  /** A statement of the form l = cl.f; */
  protected abstract void caseGlobalLoadStmt(Local dest, StaticFieldRef src);

  /** A statement of the form cl.f = l; */
  protected abstract void caseGlobalStoreStmt(StaticFieldRef dest, Local src);

  /** A return statement. e is null if a non-reference type is returned. */
  protected abstract void caseReturnStmt(Local val);

  /** A return statement returning a constant. */
  protected void caseReturnConstStmt(Constant val) {
    // default is uninteresting
    caseUninterestingStmt(statement);
  }

  /** Any type of new statement (NewStmt, NewArrayStmt, NewMultiArrayStmt) */
  protected abstract void caseAnyNewStmt(Local dest, Expr e);

  /** A new statement */
  protected void caseNewStmt(Local dest, NewExpr e) {
    caseAnyNewStmt(dest, e);
  }

  /** A newarray statement */
  protected void caseNewArrayStmt(Local dest, NewArrayExpr e) {
    caseAnyNewStmt(dest, e);
  }

  /** A anewarray statement */
  protected void caseNewMultiArrayStmt(Local dest, NewMultiArrayExpr e) {
    caseAnyNewStmt(dest, e);
  }

  /** A method invocation. dest is null if there is no reference type return value. */
  protected abstract void caseInvokeStmt(Local dest, InvokeExpr e);

  /** A throw statement */
  protected void caseThrowStmt(Local thrownException) {
    caseUninterestingStmt(statement);
  }

  /** A catch statement */
  protected void caseCatchStmt(Local dest, CaughtExceptionRef cer) {
    caseUninterestingStmt(statement);
  }

  /** Any other statement */
  protected void caseUninterestingStmt(Stmt s) {
  };

  public final void caseAssignStmt(AssignStmt s) {
    statement = s;
    Value lhs = s.getLeftOp();
    Value rhs = s.getRightOp();
    if (!(lhs.getType() instanceof RefType) && !(lhs.getType() instanceof ArrayType)) {
      if (rhs instanceof InvokeExpr) {
        caseInvokeStmt(null, (InvokeExpr) rhs);
        return;
      }
      caseUninterestingStmt(s);
      return;
    }
    if (rhs instanceof InvokeExpr) {
      caseInvokeStmt((Local) lhs, (InvokeExpr) rhs);
      return;
    }
    if (lhs instanceof Local) {
      if (rhs instanceof Local) {
        caseCopyStmt((Local) lhs, (Local) rhs);
      } else if (rhs instanceof InstanceFieldRef) {
        caseLoadStmt((Local) lhs, (InstanceFieldRef) rhs);
      } else if (rhs instanceof ArrayRef) {
        caseArrayLoadStmt((Local) lhs, (ArrayRef) rhs);
      } else if (rhs instanceof StaticFieldRef) {
        caseGlobalLoadStmt((Local) lhs, (StaticFieldRef) rhs);
      } else if (rhs instanceof NewExpr) {
        caseNewStmt((Local) lhs, (NewExpr) rhs);
      } else if (rhs instanceof NewArrayExpr) {
        caseNewArrayStmt((Local) lhs, (NewArrayExpr) rhs);
      } else if (rhs instanceof NewMultiArrayExpr) {
        caseNewMultiArrayStmt((Local) lhs, (NewMultiArrayExpr) rhs);
      } else if (rhs instanceof CastExpr) {
        CastExpr r = (CastExpr) rhs;
        Value rv = r.getOp();
        if (rv instanceof Constant) {
          caseAssignConstStmt(lhs, (Constant) rv);
        } else {
          caseCastStmt((Local) lhs, (Local) rv, r);
        }
      } else if (rhs instanceof Constant) {
        caseAssignConstStmt(lhs, (Constant) rhs);
      } else {
        throw new RuntimeException("unhandled stmt " + s);
      }
    } else if (lhs instanceof InstanceFieldRef) {
      if (rhs instanceof Local) {
        caseStoreStmt((InstanceFieldRef) lhs, (Local) rhs);
      } else if (rhs instanceof Constant) {
        caseAssignConstStmt(lhs, (Constant) rhs);
      } else {
        throw new RuntimeException("unhandled stmt " + s);
      }
    } else if (lhs instanceof ArrayRef) {
      if (rhs instanceof Local) {
        caseArrayStoreStmt((ArrayRef) lhs, (Local) rhs);
      } else if (rhs instanceof Constant) {
        caseAssignConstStmt(lhs, (Constant) rhs);
      } else {
        throw new RuntimeException("unhandled stmt " + s);
      }
    } else if (lhs instanceof StaticFieldRef) {
      if (rhs instanceof Local) {
        caseGlobalStoreStmt((StaticFieldRef) lhs, (Local) rhs);
      } else if (rhs instanceof Constant) {
        caseAssignConstStmt(lhs, (Constant) rhs);
      } else {
        throw new RuntimeException("unhandled stmt " + s);
      }
    } else if (rhs instanceof Constant) {
      caseAssignConstStmt(lhs, (Constant) rhs);
    } else {
      throw new RuntimeException("unhandled stmt " + s);
    }
  }

  public final void caseReturnStmt(ReturnStmt s) {
    statement = s;
    Value op = s.getOp();
    if (op.getType() instanceof RefType || op.getType() instanceof ArrayType) {
      if (op instanceof Constant) {
        caseReturnConstStmt((Constant) op);
      } else {
        caseReturnStmt((Local) op);
      }
    } else {
      caseReturnStmt((Local) null);
    }
  }

  public final void caseReturnVoidStmt(ReturnVoidStmt s) {
    statement = s;
    caseReturnStmt((Local) null);
  }

  public final void caseInvokeStmt(InvokeStmt s) {
    statement = s;
    caseInvokeStmt(null, s.getInvokeExpr());
  }

  public final void caseIdentityStmt(IdentityStmt s) {
    statement = s;
    Value lhs = s.getLeftOp();
    Value rhs = s.getRightOp();
    if (!(lhs.getType() instanceof RefType) && !(lhs.getType() instanceof ArrayType)) {
      caseUninterestingStmt(s);
      return;
    }
    Local llhs = (Local) lhs;
    if (rhs instanceof CaughtExceptionRef) {
      caseCatchStmt(llhs, (CaughtExceptionRef) rhs);
    } else {
      IdentityRef rrhs = (IdentityRef) rhs;
      caseIdentityStmt(llhs, rrhs);
    }
  }

  public final void caseThrowStmt(ThrowStmt s) {
    statement = s;
    caseThrowStmt((Local) s.getOp());
  }
}