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// DissassemblyBuffer.cs
//
// Author:
// Lluis Sanchez Gual <lluis@novell.com>
//
// Copyright (c) 2008 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//
using System;
using System.Collections.Generic;
using Mono.Debugging.Client;
namespace Mono.Debugging.Backend
{
public abstract class DissassemblyBuffer
{
List<AssemblyLine> lines = new List<AssemblyLine> ();
int baseIndex = 0;
long baseAddress;
const int AddrPerLine = 4;
const int ExtraDownLines = 5;
const int ExtraUpLines = 20;
public DissassemblyBuffer (long baseAddress)
{
this.baseAddress = baseAddress;
}
public AssemblyLine[] GetLines (int firstIndex, int lastIndex)
{
//Console.WriteLine ("pp GET LINES: " + firstIndex + " " + lastIndex + " " + baseIndex);
if (lastIndex >= 0)
FillDown (lastIndex);
if (firstIndex < 0)
FillUp (firstIndex);
AssemblyLine[] array = new AssemblyLine [lastIndex - firstIndex + 1];
lines.CopyTo (baseIndex + firstIndex, array, 0, lastIndex - firstIndex + 1);
return array;
}
public void FillUp (int targetLine)
{
if (baseIndex + targetLine >= 0)
return;
// Lines we are missing
int linesReq = -(baseIndex + targetLine);
//Console.WriteLine ("pp FILLUP: " + linesReq);
// Last known valid address
long lastAddr = lines.Count > 0 ? lines [0].Address : baseAddress;
// Addresses we are going to query to get the required lines
long addr = lastAddr - (linesReq + ExtraUpLines) * AddrPerLine; // 4 is just a guess
int lastCount = 0;
bool limitFound = false;
AssemblyLine[] alines;
do {
alines = GetLines (addr, lastAddr);
if (alines.Length <= lastCount) {
limitFound = true;
break;
}
addr -= (linesReq + ExtraUpLines - alines.Length) * AddrPerLine;
lastCount = alines.Length;
}
while (alines.Length < linesReq + ExtraUpLines);
int max = limitFound ? alines.Length : alines.Length - ExtraUpLines;
if (max < 0) max = 0;
// Fill the lines
for (int n=0; n < max; n++)
lines.Insert (n, alines [n + (alines.Length - max)]);
long firstAddr = lines [0].Address;
for (int n=0; n < (linesReq - max); n++) {
AssemblyLine line = new AssemblyLine (--firstAddr, "");
lines.Insert (0, line);
max++;
}
baseIndex += max;
}
public void FillDown (int targetLine)
{
if (baseIndex + targetLine < lines.Count)
return;
// Lines we are missing
int linesReq = (baseIndex + targetLine) - lines.Count + 1;
//Console.WriteLine ("pp FILLDOWN: " + linesReq);
// Last known valid address
long lastAddr = lines.Count > 0 ? lines [lines.Count - 1].Address : baseAddress;
// Addresses we are going to query to get the required lines
long addr = lastAddr + (linesReq + ExtraDownLines) * AddrPerLine; // 4 is just a guess
int lastCount = 0;
bool limitFound = false;
AssemblyLine[] alines;
do {
alines = GetLines (lastAddr, addr);
if (alines.Length <= lastCount) {
limitFound = true;
break;
}
addr += (linesReq + ExtraDownLines - alines.Length) * AddrPerLine;
lastCount = alines.Length;
}
while (alines.Length < linesReq + ExtraDownLines);
int max = limitFound ? alines.Length : alines.Length - ExtraDownLines;
// Fill the lines
for (int n=0; n < max; n++)
lines.Add (alines [n]);
lastAddr = lines [lines.Count - 1].Address;
for (int n=0; n < (linesReq - max); n++) {
AssemblyLine line = new AssemblyLine (++lastAddr, "");
lines.Add (line);
}
}
public abstract AssemblyLine[] GetLines (long startAddr, long endAddr);
}
}
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