--- a/nashorn/src/jdk/nashorn/internal/codegen/Frame.java Wed May 01 14:11:01 2013 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,196 +0,0 @@
-/*
- * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-package jdk.nashorn.internal.codegen;
-
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import jdk.nashorn.internal.ir.Symbol;
-
-/**
- * Tracks the variable area state.
- *
- */
-public final class Frame {
- /** Previous frame. */
- private Frame previous;
-
- /** Current variables. */
- private final ArrayList<Symbol> symbols;
-
- /** Number of slots in previous frame. */
- private int baseCount;
-
- /** Number of slots in this frame. */
- private int count;
-
- /**
- * Constructor.
- *
- * @param previous frame, the parent variable frame
- */
- public Frame(final Frame previous) {
- this.previous = previous;
- this.symbols = new ArrayList<>();
- this.baseCount = getBaseCount();
- this.count = 0;
- }
-
- /**
- * Copy constructor
- * @param frame
- * @param symbols
- */
- private Frame(final Frame frame, final List<Symbol> symbols) {
- this.previous = frame.getPrevious() == null ? null : new Frame(frame.getPrevious(), frame.getPrevious().getSymbols());
- this.symbols = new ArrayList<>(frame.getSymbols());
- this.baseCount = frame.getBaseCount();
- this.count = frame.getCount();
- }
-
- /**
- * Copy the frame
- *
- * @return a new frame with the identical contents
- */
- public Frame copy() {
- return new Frame(this, getSymbols());
- }
-
- /**
- * Add a new variable to the frame.
- * @param symbol Symbol representing variable.
- */
- public void addSymbol(final Symbol symbol) {
- final int slot = symbol.getSlot();
- if (slot < 0) {
- symbols.add(symbol);
- count += symbol.slotCount();
- }
- }
-
- /**
- * Realign slot numbering prior to code generation.
- * @return Number of slots in frame.
- */
- public int realign() {
- baseCount = getBaseCount();
- count = 0;
-
- for (final Symbol symbol : symbols) {
- if (symbol.hasSlot()) {
- symbol.setSlot(baseCount + count);
- count += symbol.slotCount();
- }
- }
-
- return count;
- }
-
- /**
- * Return the slot count of previous frames.
- * @return Number of slots in previous frames.
- */
- private int getBaseCount() {
- return previous != null ? previous.getSlotCount() : 0;
- }
-
- /**
- * Determine the number of slots to top of frame.
- * @return Number of slots in total.
- */
- public int getSlotCount() {
- return baseCount + count;
- }
-
- @Override
- public String toString() {
- final StringBuilder sb = new StringBuilder();
- Frame f = this;
- boolean hasPrev = false;
- int pos = 0;
-
- do {
- if (hasPrev) {
- sb.append("\n");
- }
-
- sb.append("#").
- append(pos++).
- append(" {baseCount:").
- append(baseCount).
- append(", ").
- append("count:").
- append(count).
- append("} ");
-
- for (final Symbol var : f.getSymbols()) {
- sb.append('[').
- append(var.toString()).
- append(' ').
- append(var.hashCode()).
- append("] ");
- }
-
- f = f.getPrevious();
- hasPrev = true;
- } while (f != null);
-
- return sb.toString();
- }
-
- /**
- * Get variable count for this frame
- * @return variable count
- */
- public int getCount() {
- return count;
- }
-
- /**
- * Get previous frame
- * @return previous frame
- */
- public Frame getPrevious() {
- return previous;
- }
-
- /**
- * Set previous frame
- * @param previous previous frame
- */
- public void setPrevious(final Frame previous) {
- this.previous = previous;
- }
-
- /**
- * Get symbols in frame
- * @return a list of symbols in this frame
- */
- public List<Symbol> getSymbols() {
- return Collections.unmodifiableList(symbols);
- }
- }