tree.java

GJC编译器的源代码。是一个开放源代码的工业级编译器。

      * @param flags variable flags
      * @param name variable name
      * @param vartype type of the variable
      * @param init variables initial value
      * @param sym symbol
      */
    public static class VarDef extends Tree {
        public long flags;
        public Name name;
        public Tree vartype;
        public Tree init;
        public VarSymbol sym;

        public VarDef(long flags, Name name, Tree vartype, Tree init, VarSymbol sym) {
            super(VARDEF);
            this.flags = flags;
            this.name = name;
            this.vartype = vartype;
            this.init = init;
            this.sym = sym;
        }

        public void accept(Visitor v) {
            v.visitVarDef(this);
        }
        public static final List emptyList = new List();
    }

    /**
      * A no-op statement ";".
      */
    public static class Skip extends Tree {

        public Skip() {
            super(SKIP);
        }

        public void accept(Visitor v) {
            v.visitSkip(this);
        }
    }

    /**
      * A statement block.
      * @param stats statements
      * @param flags modifier
      */
    public static class Block extends Tree {
        public long flags;
        public List stats;
        public int endpos = Position.NOPOS;

        public Block(long flags, List stats) {
            super(BLOCK);
            this.stats = stats;
            this.flags = flags;
        }

        public void accept(Visitor v) {
            v.visitBlock(this);
        }
    }

    /**
      * A do loop
      */
    public static class DoLoop extends Tree {
        public Tree body;
        public Tree cond;

        public DoLoop(Tree body, Tree cond) {
            super(DOLOOP);
            this.body = body;
            this.cond = cond;
        }

        public void accept(Visitor v) {
            v.visitDoLoop(this);
        }
    }

    /**
      * A while loop
      */
    public static class WhileLoop extends Tree {
        public Tree cond;
        public Tree body;

        public WhileLoop(Tree cond, Tree body) {
            super(WHILELOOP);
            this.cond = cond;
            this.body = body;
        }

        public void accept(Visitor v) {
            v.visitWhileLoop(this);
        }
    }

    /**
      * A for loop.
      */
    public static class ForLoop extends Tree {
        public List init;
        public Tree cond;
        public List step;
        public Tree body;

        public ForLoop(List init, Tree cond, List step, Tree body) {
            super(FORLOOP);
            this.init = init;
            this.cond = cond;
            this.step = step;
            this.body = body;
        }

        public void accept(Visitor v) {
            v.visitForLoop(this);
        }
    }

    /**
      * A labelled expression or statement.
      */
    public static class Labelled extends Tree {
        public Name label;
        public Tree body;

        public Labelled(Name label, Tree body) {
            super(LABELLED);
            this.label = label;
            this.body = body;
        }

        public void accept(Visitor v) {
            v.visitLabelled(this);
        }
    }

    /**
      * A "switch ( ) { }" construction.
      */
    public static class Switch extends Tree {
        public Tree selector;
        public List cases;

        public Switch(Tree selector, List cases) {
            super(SWITCH);
            this.selector = selector;
            this.cases = cases;
        }

        public void accept(Visitor v) {
            v.visitSwitch(this);
        }
    }

    /**
      * A "case  :" of a switch.
      */
    public static class Case extends Tree {
        public Tree pat;
        public List stats;

        public Case(Tree pat, List stats) {
            super(CASE);
            this.pat = pat;
            this.stats = stats;
        }

        public void accept(Visitor v) {
            v.visitCase(this);
        }
    }

    /**
      * A synchronized block.
      */
    public static class Synchronized extends Tree {
        public Tree lock;
        public Tree body;

        public Synchronized(Tree lock, Tree body) {
            super(SYNCHRONIZED);
            this.lock = lock;
            this.body = body;
        }

        public void accept(Visitor v) {
            v.visitSynchronized(this);
        }
    }

    /**
      * A "try { } catch ( ) { } finally { }" block.
      */
    public static class Try extends Tree {
        public Tree body;
        public List catchers;
        public Tree finalizer;

        public Try(Tree body, List catchers, Tree finalizer) {
            super(TRY);
            this.body = body;
            this.catchers = catchers;
            this.finalizer = finalizer;
        }

        public void accept(Visitor v) {
            v.visitTry(this);
        }
    }

    /**
      * A catch block.
      */
    public static class Catch extends Tree {
        public VarDef param;
        public Tree body;

        public Catch(VarDef param, Tree body) {
            super(CATCH);
            this.param = param;
            this.body = body;
        }

        public void accept(Visitor v) {
            v.visitCatch(this);
        }
        public static List emptyList = new List();
    }

    /**
      * A ( ) ? ( ) : ( ) conditional expression
      */
    public static class Conditional extends Tree {
        public Tree cond;
        public Tree truepart;
        public Tree falsepart;

        public Conditional(Tree cond, Tree truepart, Tree falsepart) {
            super(CONDEXPR);
            this.cond = cond;
            this.truepart = truepart;
            this.falsepart = falsepart;
        }

        public void accept(Visitor v) {
            v.visitConditional(this);
        }
    }

    /**
      * An "if ( ) { } else { }" block
      */
    public static class If extends Tree {
        public Tree cond;
        public Tree thenpart;
        public Tree elsepart;

        public If(Tree cond, Tree thenpart, Tree elsepart) {
            super(IF);
            this.cond = cond;
            this.thenpart = thenpart;
            this.elsepart = elsepart;
        }

        public void accept(Visitor v) {
            v.visitIf(this);
        }
    }

    /**
      * an expression statement
      * @param expr expression structure
      */
    public static class Exec extends Tree {
        public Tree expr;

        public Exec(Tree expr) {
            super(EXEC);
            this.expr = expr;
        }

        public void accept(Visitor v) {
            v.visitExec(this);
        }
    }

    /**
      * A break from a loop or switch.
      */
    public static class Break extends Tree {
        public Name label;
        public Tree target;

        public Break(Name label, Tree target) {
            super(BREAK);
            this.label = label;
            this.target = target;
        }

        public void accept(Visitor v) {
            v.visitBreak(this);
        }
    }

    /**
      * A continue of a loop.
      */
    public static class Continue extends Tree {
        public Name label;
        public Tree target;

        public Continue(Name label, Tree target) {
            super(CONTINUE);
            this.label = label;
            this.target = target;
        }

        public void accept(Visitor v) {
            v.visitContinue(this);
        }
    }

    /**
      * A return statement.
      */
    public static class Return extends Tree {
        public Tree expr;

        public Return(Tree expr) {
            super(RETURN);
            this.expr = expr;
        }

        public void accept(Visitor v) {
            v.visitReturn(this);
        }
    }

    /**
      * A throw statement.
      */
    public static class Throw extends Tree {
        public Tree expr;

        public Throw(Tree expr) {
            super(THROW);
            this.expr = expr;
        }

        public void accept(Visitor v) {
            v.visitThrow(this);
        }
    }

    /**
      * An assert statement.
      */
    public static class Assert extends Tree {
        public Tree cond;
        public Tree detail;

        public Assert(Tree cond, Tree detail) {
            super(ASSERT);
            this.cond = cond;
            this.detail = detail;
        }

        public void accept(Visitor v) {
            v.visitAssert(this);
        }
    }

    /**
      * A method invocation
      */
    public static class Apply extends Tree {
        public Tree meth;
        public List args;

        public Apply(Tree meth, List args) {
            super(APPLY);
            this.meth = meth;
            this.args = args;
        }

        public void accept(Visitor v) {
            v.visitApply(this);
        }
    }

    /**
      * A new(...) operation.
      */
    public static class NewClass extends Tree {
        public Tree encl;
        public Tree clazz;
        public List args;
        public ClassDef def;
        public Symbol constructor;

        public NewClass(Tree encl, Tree clazz, List args, ClassDef def,
                Symbol constructor) {
            super(NEWCLASS);
            this.encl = encl;
            this.clazz = clazz;
            this.args = args;
            this.def = def;
            this.constructor = constructor;
        }

        public void accept(Visitor v) {
            v.visitNewClass(this);
        }
    }

    /**
      * A new[...] operation.
      */
    public static class NewArray extends Tree {
        public Tree elemtype;
        public List dims;
        public List elems;

        public NewArray(Tree elemtype, List dims, List elems) {
            super(NEWARRAY);
            this.elemtype = elemtype;
            this.dims = dims;
            this.elems = elems;
        }

        public void accept(Visitor v) {
            v.visitNewArray(this);
        }
    }

    /**
      * A parenthesized subexpression ( ... )
      */
    public static class Parens extends Tree {
        public Tree expr;

        public Parens(Tree expr) {
            super(PARENS);
            this.expr = expr;
        }

        public void accept(Visitor v) {
            v.visitParens(this);
        }
    }

    /**
      * A assignment with "=".
      */
    public static class Assign extends Tree {
        public Tree lhs;
        public Tree rhs;

        public Assign(Tree lhs, Tree rhs) {
            super(ASSIGN);
            this.lhs = lhs;
            this.rhs = rhs;
        }

        public void accept(Visitor v) {
            v.visitAssign(this);
        }
    }

    /**
      * An assignment with "+=", "|=" ...
      */
    public static class Assignop extends Tree {
        public Tree lhs;
        public Tree rhs;
        public Symbol operator;

        public Assignop(int opcode, Tree lhs, Tree rhs, Symbol operator) {
            super(opcode);
            this.lhs = lhs;
            this.rhs = rhs;
            this.operator = operator;
        }