Mercurial > hg > truffle
view graal/com.oracle.max.asm/src/com/oracle/max/asm/Label.java @ 5563:6a2671066204
added NewInstanceSnippets for lowering NewInstanceNodes (currently disabled by default)
added Word type and WordTypeRewriterPhase to support programming against machine word values in snippets without duplicating the code for 32 and 64 bit platforms
added GraphUtil.approxSourceLocation() utility method for getting an approximate source code location for a node
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 11 Jun 2012 15:39:57 +0200 |
parents | bc8527f3071c |
children |
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/* * Copyright (c) 2009, 2011, 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. * * 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 com.oracle.max.asm; import java.util.ArrayList; /** * This class represents a label within assembly code. */ public final class Label { private int position = -1; /** * References to instructions that jump to this unresolved label. * These instructions need to be patched when the label is bound * using the {@link #patchInstructions(AbstractAssembler)} method. */ private ArrayList<Integer> patchPositions = new ArrayList<>(4); /** * Returns the position of this label in the code buffer. * @return the position */ public int position() { assert position >= 0 : "Unbound label is being referenced"; return position; } public Label() { } /** * Binds the label to the specified position. * @param pos the position */ protected void bind(int pos) { this.position = pos; assert isBound(); } public boolean isBound() { return position >= 0; } public void addPatchAt(int branchLocation) { assert !isBound() : "Label is already bound"; patchPositions.add(branchLocation); } protected void patchInstructions(AbstractAssembler masm) { assert isBound() : "Label should be bound"; int target = position; for (int i = 0; i < patchPositions.size(); ++i) { int pos = patchPositions.get(i); masm.patchJumpTarget(pos, target); } } @Override public String toString() { return isBound() ? String.valueOf(position()) : "?"; } }