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77 lines
2.3 KiB
77 lines
2.3 KiB
/*
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* ReturnBlock (c) 1998 Jochen Hoenicke
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*
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* You may distribute under the terms of the GNU General Public License.
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*
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* IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
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* INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
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* THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE
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* HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
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* BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
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* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* $Id$
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*/
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package jode.flow;
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import jode.decompiler.TabbedPrintWriter;
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import jode.expr.Expression;
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/**
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* This is the structured block for a Return block.
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*/
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public class ReturnBlock extends InstructionContainer {
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/**
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* The loads that are on the stack before instr is executed.
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*/
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VariableStack stack;
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public ReturnBlock() {
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super(null);
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}
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public ReturnBlock(Expression instr) {
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super(instr, new Jump(-1));
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}
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/**
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* This does take the instr into account and modifies stack
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* accordingly. It then calls super.mapStackToLocal.
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* @param stack the stack before the instruction is called
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* @return stack the stack afterwards.
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*/
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public VariableStack mapStackToLocal(VariableStack stack) {
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VariableStack newStack;
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int params = instr.getOperandCount();
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if (params > 0) {
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this.stack = stack.peek(params);
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newStack = stack.pop(params);
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} else
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newStack = stack;
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return null;
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}
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public void removePush() {
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if (stack != null)
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instr = stack.mergeIntoExpression(instr, used);
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}
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/**
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* Tells if this block needs braces when used in a if or while block.
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* @return true if this block should be sorrounded by braces.
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*/
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public boolean needsBraces() {
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return declare != null && !declare.isEmpty();
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}
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public void dumpInstruction(TabbedPrintWriter writer)
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throws java.io.IOException
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{
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writer.println("return" +
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(instr == null ? "" : " " + instr.simplify()) + ";");
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}
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}
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