crtable.java

这是实现Javac功能的GJC的最新源码

        public void visitCatch(Catch tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.param));
            sr.mergeWith(csp(tree.body));
            result = sr;
        }

        public void visitConditional(Conditional tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.cond));
            sr.mergeWith(csp(tree.truepart));
            sr.mergeWith(csp(tree.falsepart));
            result = sr;
        }

        public void visitIf(If tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.cond));
            sr.mergeWith(csp(tree.thenpart));
            sr.mergeWith(csp(tree.elsepart));
            result = sr;
        }

        public void visitExec(Exec tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.expr));
            result = sr;
        }

        public void visitBreak(Break tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            result = sr;
        }

        public void visitContinue(Continue tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            result = sr;
        }

        public void visitReturn(Return tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.expr));
            result = sr;
        }

        public void visitThrow(Throw tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.expr));
            result = sr;
        }

        public void visitAssert(Assert tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.cond));
            sr.mergeWith(csp(tree.detail));
            result = sr;
        }

        public void visitApply(Apply tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.meth));
            sr.mergeWith(csp(tree.args));
            result = sr;
        }

        public void visitNewClass(NewClass tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.encl));
            sr.mergeWith(csp(tree.clazz));
            sr.mergeWith(csp(tree.args));
            sr.mergeWith(csp(tree.def));
            result = sr;
        }

        public void visitNewArray(NewArray tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.elemtype));
            sr.mergeWith(csp(tree.dims));
            sr.mergeWith(csp(tree.elems));
            result = sr;
        }

        public void visitParens(Parens tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.expr));
            result = sr;
        }

        public void visitAssign(Assign tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.lhs));
            sr.mergeWith(csp(tree.rhs));
            result = sr;
        }

        public void visitAssignop(Assignop tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.lhs));
            sr.mergeWith(csp(tree.rhs));
            result = sr;
        }

        public void visitUnary(Unary tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.arg));
            result = sr;
        }

        public void visitBinary(Binary tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.lhs));
            sr.mergeWith(csp(tree.rhs));
            result = sr;
        }

        public void visitTypeCast(TypeCast tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.clazz));
            sr.mergeWith(csp(tree.expr));
            result = sr;
        }

        public void visitTypeTest(TypeTest tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.expr));
            sr.mergeWith(csp(tree.clazz));
            result = sr;
        }

        public void visitIndexed(Indexed tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.indexed));
            sr.mergeWith(csp(tree.index));
            result = sr;
        }

        public void visitSelect(Select tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.selected));
            result = sr;
        }

        public void visitIdent(Ident tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            result = sr;
        }

        public void visitLiteral(Literal tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            result = sr;
        }

        public void visitTypeIdent(TypeIdent tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            result = sr;
        }

        public void visitTypeArray(TypeArray tree) {
            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
            sr.mergeWith(csp(tree.elemtype));
            result = sr;
        }

        public void visitErroneous(Erroneous tree) {
            result = null;
        }

        public void visitTree(Tree tree) {
            assert false;
        }

        /**
          * The start position of given tree.
          */
        public int startPos(Tree tree) {
            if (tree == null)
                return Position.NOPOS;
            return tree.pos;
        }

        /**
          * The end position of given tree, if it has
          *  defined endpos, NOPOS otherwise.
          */
        public int endPos(Tree tree) {
            if (tree == null)
                return Position.NOPOS;
            if (tree.tag == Tree.BLOCK)
                return ((Block) tree).endpos;
            Integer endpos = (Integer) endPositions.get(tree);
            if (endpos != null)
                return endpos.intValue();
            return Position.NOPOS;
        }
    }

    /**
      * This class contains a CharacterRangeTableEntry.
      */
    class CRTEntry {

        /**
         * A tree or a list of trees to obtain source positions.
         */
        Object tree;

        /**
         * The flags described in the CharacterRangeTable spec.
         */
        int flags;

        /**
         * The starting code position of this entry.
         */
        int startPc;

        /**
         * The ending code position of this entry.
         */
        int endPc;

        /**
         * Constructor
         */
        CRTEntry(Object tree, int flags, int startPc, int endPc) {
            super();
            this.tree = tree;
            this.flags = flags;
            this.startPc = startPc;
            this.endPc = endPc;
        }
    }

    /**
      * This class contains source positions
      *  for some tree or list of trees.
      */
    class SourceRange {

        /**
         * The starting source position.
         */
        int startPos;

        /**
         * The ending source position.
         */
        int endPos;

        /**
         * Constructor
         */
        SourceRange() {
            super();
            startPos = Position.NOPOS;
            endPos = Position.NOPOS;
        }

        /**
          * Constructor
          */
        SourceRange(int startPos, int endPos) {
            super();
            this.startPos = startPos;
            this.endPos = endPos;
        }

        /**
          * Compare the starting and the ending positions
          *  of the source range and combines them assigning
          *  the widest range to this.
          */
        SourceRange mergeWith(SourceRange sr) {
            if (sr == null)
                return this;
            if (startPos == Position.NOPOS)
                startPos = sr.startPos;
            else if (sr.startPos != Position.NOPOS)
                startPos = (startPos < sr.startPos ? startPos : sr.startPos);
            if (endPos == Position.NOPOS)
                endPos = sr.endPos;
            else if (sr.endPos != Position.NOPOS)
                endPos = (endPos > sr.endPos ? endPos : sr.endPos);
            return this;
        }
    }
}