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/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSimulator Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @brief Compile a script to produce a ScriptObjCode object
*/
using System;
using System.IO;
namespace OpenSim.Region.ScriptEngine.Yengine
{
public partial class XMRInstance
{
/**
* @brief Compile a script to produce a ScriptObjCode object
* @returns object code pointer or null if compile error
* also can throw compile error exception
*/
public ScriptObjCode Compile()
{
Stream objFileStream = null;
StreamWriter asmFileWriter = null;
string sourceHash = null;
TextWriter saveSource = null;
string objFileName = GetScriptFileName (m_ScriptObjCodeKey + ".yobj");
string tmpFileName = GetScriptFileName (m_ScriptObjCodeKey + ".ytmp");
// If we already have an object file, don't bother compiling.
if (!m_ForceRecomp && File.Exists(objFileName))
{
objFileStream = File.OpenRead (objFileName);
}
else
{
// If source file empty, try to read from asset server.
if (EmptySource (m_SourceCode))
m_SourceCode = FetchSource (m_CameFrom);
// Maybe write script source to a file for debugging.
if (m_Engine.m_ScriptDebugSaveSource)
{
string lslFileName = GetScriptFileName (m_ScriptObjCodeKey + ".lsl");
// m_log.Debug ("[YEngine]: MMRScriptCompileSaveSource: saving to " + lslFileName);
saveSource = File.CreateText (lslFileName);
}
// Parse source string into tokens.
TokenBegin tokenBegin;
try
{
tokenBegin = TokenBegin.Construct(m_CameFrom, saveSource, ErrorHandler, m_SourceCode, out sourceHash);
}
finally
{
if (saveSource != null)
saveSource.Close ();
}
if (tokenBegin == null)
{
m_log.Debug ("[YEngine]: parsing errors on " + m_ScriptObjCodeKey);
return null;
}
// Create object file one way or another.
try
{
// Create abstract syntax tree from raw tokens.
TokenScript tokenScript = ScriptReduce.Reduce(tokenBegin);
if (tokenScript == null)
{
m_log.Warn ("[YEngine]: reduction errors on " + m_ScriptObjCodeKey + " (" + m_CameFrom + ")");
PrintCompilerErrors();
return null;
}
// Compile abstract syntax tree to write object file.
using(BinaryWriter objFileWriter = new BinaryWriter(File.Create(tmpFileName)))
{
bool ok = ScriptCodeGen.CodeGen(tokenScript, objFileWriter, sourceHash);
if (!ok)
{
m_log.Warn ("[YEngine]: compile error on " + m_ScriptObjCodeKey + " (" + m_CameFrom + ")");
PrintCompilerErrors ();
return null;
}
}
// File has been completely written.
// If there is an old one laying around, delete it now.
// Then re-open the new file for reading from the beginning.
if (File.Exists(objFileName))
File.Replace(tmpFileName, objFileName, null);
else
File.Move(tmpFileName, objFileName);
objFileStream = File.OpenRead(objFileName);
}
finally
{
// In case something went wrong writing temp file, delete it.
File.Delete (tmpFileName);
}
// Since we just wrote the .xmrobj file, maybe save disassembly.
if (m_Engine.m_ScriptDebugSaveIL)
{
string asmFileName = GetScriptILFileName(m_ScriptObjCodeKey + ".yasm");
// m_log.Debug ("[YEngine]: MMRScriptCompileSaveILGen: saving to " + asmFileName);
asmFileWriter = File.CreateText (asmFileName);
}
}
// Read object file to create ScriptObjCode object.
// Maybe also write disassembly to a file for debugging.
BinaryReader objFileReader = new BinaryReader (objFileStream);
ScriptObjCode scriptObjCode = null;
try
{
scriptObjCode = new ScriptObjCode (objFileReader, asmFileWriter, null);
}
finally
{
objFileReader.Close ();
if (asmFileWriter != null)
{
asmFileWriter.Flush ();
asmFileWriter.Close ();
}
}
return scriptObjCode;
}
private void PrintCompilerErrors ()
{
m_log.Info ("[YEngine]: - " + m_Part.GetWorldPosition () + " " + m_DescName);
foreach (string error in m_CompilerErrors)
{
m_log.Info ("[YEngine]: - " + error);
}
}
/**
* @brief Check for empty source, allowing for a first line of //... script engine selector.
*/
public static bool EmptySource (string source)
{
int len = source.Length;
bool skipeol = false;
for (int i = 0; i < len; i ++)
{
char c = source[i];
skipeol &= c != '\n';
skipeol |= (c == '/') && (i + 1 < len) && (source[i+1] == '/');
if ((c > ' ') && !skipeol)
return false;
}
return true;
}
}
}
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