crtable.java

是一款用JAVA 编写的编译器 具有很强的编译功能

        }

        public void visitCase(JCCase tree) {
	    SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
	    sr.mergeWith(csp(tree.pat));
	    sr.mergeWith(csp(tree.stats));
	    result = sr;
        }

        public void visitSynchronized(JCSynchronized tree) {
	    SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
	    sr.mergeWith(csp(tree.lock));
	    sr.mergeWith(csp(tree.body));
	    result = sr;
        }

        public void visitTry(JCTry tree) {
	    SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
	    sr.mergeWith(csp(tree.body));
	    sr.mergeWith(cspCatchers(tree.catchers));
	    sr.mergeWith(csp(tree.finalizer));
	    result = sr;
        }

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

        public void visitConditional(JCConditional 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(JCIf 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(JCExpressionStatement tree) {
	    SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
	    sr.mergeWith(csp(tree.expr));
	    result = sr;
        }

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

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

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

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

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

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

        public void visitNewClass(JCNewClass 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(JCNewArray 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(JCParens tree) {
	    SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
	    sr.mergeWith(csp(tree.expr));
	    result = sr;
        }

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

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

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

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

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

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

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

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

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

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

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

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

        public void visitTypeApply(JCTypeApply tree) {
	    SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
	    sr.mergeWith(csp(tree.clazz));
	    sr.mergeWith(csp(tree.arguments));
	    result = sr;
        }

        public void visitTypeParameter(JCTypeParameter tree) {
	    SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
	    sr.mergeWith(csp(tree.bounds));
	    result = sr;
        }

        public void visitWildcard(JCWildcard tree) {
	    result = null;
        }

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

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

        /** The start position of given tree.
         */
        public int startPos(JCTree 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(JCTree tree) {
	    if (tree == null) return Position.NOPOS;
	    if (tree.getTag() == JCTree.BLOCK)
	        return ((JCBlock) tree).endpos;
	    Integer endpos = endPositions.get(tree);
	    if (endpos != null)
	        return endpos.intValue();
	    return Position.NOPOS;	
        }
    }

    /** This class contains a CharacterRangeTableEntry.
     */
    static 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) {
	    this.tree = tree;
	    this.flags = flags;
	    this.startPc = startPc;
	    this.endPc = endPc;
	}
    }


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

        /** The starting source position.
	 */
	int startPos;
	
	/** The ending source position.
	 */
	int endPos;
	
	/** Constructor */
	SourceRange() {
	    startPos = Position.NOPOS;
	    endPos = Position.NOPOS;
	}

	/** Constructor */
	SourceRange(int startPos, int endPos) {
	    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;
	}
    }

}