| /* |
| * Copyright (c) 2001, 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 sun.jvm.hotspot.debugger.cdbg.basic; |
| |
| import java.util.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.debugger.cdbg.*; |
| import sun.jvm.hotspot.utilities.AddressOps; |
| |
| public class BasicLineNumberMapping { |
| private List infoList; |
| |
| public BasicLineNumberMapping() { |
| } |
| |
| /** Add line number information for the given PC. The end PC may be |
| a very loose approximation (i.e., the end of the given DLL) if |
| that information is not available in the debug information. |
| recomputeEndPCs() will recompute them if needed. */ |
| public void addLineNumberInfo(BasicLineNumberInfo info) { |
| if (infoList == null) { |
| infoList = new ArrayList(); |
| } |
| infoList.add(info); |
| } |
| |
| /** Sort the line number information by increasing starting program |
| counter. This must be done before any queries are made. */ |
| public void sort() { |
| if (infoList == null) return; |
| Collections.sort(infoList, new Comparator() { |
| public int compare(Object o1, Object o2) { |
| BasicLineNumberInfo l1 = (BasicLineNumberInfo) o1; |
| BasicLineNumberInfo l2 = (BasicLineNumberInfo) o2; |
| Address a1 = l1.getStartPC(); |
| Address a2 = l2.getStartPC(); |
| if (AddressOps.lt(a1, a2)) { return -1; } |
| if (AddressOps.gt(a1, a2)) { return 1; } |
| return 0; |
| } |
| }); |
| } |
| |
| /** Recomputes the ending PCs of each interval based on the starting |
| PC of the next one. If this needs to be called, must be called |
| after sort(). */ |
| public void recomputeEndPCs() { |
| if (infoList == null) return; |
| for (int i = 0; i < infoList.size() - 1; i++) { |
| BasicLineNumberInfo i1 = get(i); |
| BasicLineNumberInfo i2 = get(i + 1); |
| i1.setEndPC(i2.getStartPC()); |
| } |
| } |
| |
| public BasicLineNumberInfo lineNumberForPC(Address pc) throws DebuggerException { |
| if (infoList == null) return null; |
| return searchLineNumbers(pc, 0, infoList.size() - 1); |
| } |
| |
| public void iterate(LineNumberVisitor v) { |
| if (infoList == null) return; |
| for (int i = 0; i < infoList.size(); i++) { |
| v.doLineNumber(get(i)); |
| } |
| } |
| |
| //---------------------------------------------------------------------- |
| // Internals only below this point |
| // |
| |
| private BasicLineNumberInfo get(int i) { |
| return (BasicLineNumberInfo) infoList.get(i); |
| } |
| |
| private BasicLineNumberInfo searchLineNumbers(Address addr, int lowIdx, int highIdx) { |
| if (highIdx < lowIdx) return null; |
| if (lowIdx == highIdx) { |
| // Base case: see whether start PC is less than or equal to addr |
| if (check(addr, lowIdx)) { |
| return get(lowIdx); |
| } else { |
| return null; |
| } |
| } else if (lowIdx == highIdx - 1) { |
| if (check(addr, lowIdx)) { |
| return get(lowIdx); |
| } else if (check(addr, highIdx)) { |
| return get(highIdx); |
| } else { |
| return null; |
| } |
| } |
| int midIdx = (lowIdx + highIdx) >> 1; |
| BasicLineNumberInfo info = get(midIdx); |
| if (AddressOps.lt(addr, info.getStartPC())) { |
| // Always move search down |
| return searchLineNumbers(addr, lowIdx, midIdx); |
| } else if (AddressOps.equal(addr, info.getStartPC())) { |
| return info; |
| } else { |
| // Move search up |
| return searchLineNumbers(addr, midIdx, highIdx); |
| } |
| } |
| |
| private boolean check(Address addr, int idx) { |
| BasicLineNumberInfo info = get(idx); |
| if (AddressOps.lte(info.getStartPC(), addr)) { |
| return true; |
| } else { |
| return false; |
| } |
| } |
| } |