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1 /*
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2 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
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3 * code is released under a tri EPL/GPL/LGPL license. You can use it,
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4 * redistribute it and/or modify it under the terms of the:
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5 *
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6 * Eclipse Public License version 1.0
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7 * GNU General Public License version 2
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8 * GNU Lesser General Public License version 2.1
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9 */
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10 package com.oracle.truffle.ruby.nodes.core;
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11
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12 import com.oracle.truffle.api.*;
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13 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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14 import com.oracle.truffle.api.frame.*;
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15 import com.oracle.truffle.api.nodes.*;
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16 import com.oracle.truffle.ruby.nodes.*;
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17 import com.oracle.truffle.ruby.runtime.*;
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18
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19 /**
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20 * A list of expressions to build up into a string.
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21 */
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22 @NodeInfo(shortName = "interpolated-string")
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23 public final class InterpolatedStringNode extends RubyNode {
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24
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25 @CompilationFinal private int expectedLength = 64;
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26
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27 @Children protected final RubyNode[] children;
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28
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29 public InterpolatedStringNode(RubyContext context, SourceSection sourceSection, RubyNode[] children) {
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30 super(context, sourceSection);
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31 this.children = adoptChildren(children);
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32 }
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33
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34 @ExplodeLoop
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35 @Override
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36 public Object execute(VirtualFrame frame) {
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37 final StringBuilder builder = new StringBuilder(expectedLength);
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38
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39 for (int n = 0; n < children.length; n++) {
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40 builder.append(children[n].execute(frame).toString());
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41 }
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42
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43 if (builder.length() > expectedLength) {
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44 CompilerDirectives.transferToInterpreterAndInvalidate();
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45 expectedLength = builder.length() * 2;
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46 }
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47
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48 return getContext().makeString(builder.toString());
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49 }
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50
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51 @ExplodeLoop
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52 @Override
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53 public void executeVoid(VirtualFrame frame) {
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54 for (int n = 0; n < children.length; n++) {
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55 children[n].executeVoid(frame);
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56 }
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57 }
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58
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59 }
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