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//
// Symbols.cs
//
// Author:
// Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2011 Jb Evain
//
// 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.IO;
using System.Runtime.InteropServices;
using SR = System.Reflection;

using Mono.Collections.Generic;

namespace Mono.Cecil.Cil {

[StructLayout (LayoutKind.Sequential)]
public struct ImageDebugDirectory {
public int Characteristics;
public int TimeDateStamp;
public short MajorVersion;
public short MinorVersion;
public int Type;
public int SizeOfData;
public int AddressOfRawData;
public int PointerToRawData;
}

public sealed class Scope : IVariableDefinitionProvider {

Instruction start;
Instruction end;

Collection<Scope> scopes;
Collection<VariableDefinition> variables;

public Instruction Start {
get { return start; }
set { start = value; }
}

public Instruction End {
get { return end; }
set { end = value; }
}

public bool HasScopes {
get { return !scopes.IsNullOrEmpty (); }
}

public Collection<Scope> Scopes {
get {
if (scopes == null)
scopes = new Collection<Scope> ();

return scopes;
}
}

public bool HasVariables {
get { return !variables.IsNullOrEmpty (); }
}

public Collection<VariableDefinition> Variables {
get {
if (variables == null)
variables = new Collection<VariableDefinition> ();

return variables;
}
}
}

public struct InstructionSymbol {

public readonly int Offset;
public readonly SequencePoint SequencePoint;

public InstructionSymbol (int offset, SequencePoint sequencePoint)
{
this.Offset = offset;
this.SequencePoint = sequencePoint;
}
}

public sealed class MethodSymbols {

internal int code_size;
internal string method_name;
internal MetadataToken method_token;
internal MetadataToken local_var_token;
internal Collection<VariableDefinition> variables;
internal Collection<InstructionSymbol> instructions;

public bool HasVariables {
get { return !variables.IsNullOrEmpty (); }
}

public Collection<VariableDefinition> Variables {
get {
if (variables == null)
variables = new Collection<VariableDefinition> ();

return variables;
}
}

public Collection<InstructionSymbol> Instructions {
get {
if (instructions == null)
instructions = new Collection<InstructionSymbol> ();

return instructions;
}
}

public int CodeSize {
get { return code_size; }
}

public string MethodName {
get { return method_name; }
}

public MetadataToken MethodToken {
get { return method_token; }
}

public MetadataToken LocalVarToken {
get { return local_var_token; }
}

internal MethodSymbols (string methodName)
{
this.method_name = methodName;
}

public MethodSymbols (MetadataToken methodToken)
{
this.method_token = methodToken;
}
}

public delegate Instruction InstructionMapper (int offset);

public interface ISymbolReader : IDisposable {

bool ProcessDebugHeader (ImageDebugDirectory directory, byte [] header);
void Read (MethodBody body, InstructionMapper mapper);
void Read (MethodSymbols symbols);
}

public interface ISymbolReaderProvider {

ISymbolReader GetSymbolReader (ModuleDefinition module, string fileName);
ISymbolReader GetSymbolReader (ModuleDefinition module, Stream symbolStream);
}

static class SymbolProvider {

static readonly string symbol_kind = Type.GetType ("Mono.Runtime") != null ? "Mdb" : "Pdb";

static SR.AssemblyName GetPlatformSymbolAssemblyName ()
{
var cecil_name = typeof (SymbolProvider).Assembly.GetName ();

var name = new SR.AssemblyName {
Name = "Mono.Cecil." + symbol_kind,
Version = cecil_name.Version,
};

name.SetPublicKeyToken (cecil_name.GetPublicKeyToken ());

return name;
}

static Type GetPlatformType (string fullname)
{
var type = Type.GetType (fullname);
if (type != null)
return type;

var assembly_name = GetPlatformSymbolAssemblyName ();

type = Type.GetType (fullname + ", " + assembly_name.FullName);
if (type != null)
return type;

try {
var assembly = SR.Assembly.Load (assembly_name);
if (assembly != null)
return assembly.GetType (fullname);
} catch (FileNotFoundException) {
#if !CF
} catch (FileLoadException) {
#endif
}

return null;
}

static ISymbolReaderProvider reader_provider;

public static ISymbolReaderProvider GetPlatformReaderProvider ()
{
if (reader_provider != null)
return reader_provider;

var type = GetPlatformType (GetProviderTypeName ("ReaderProvider"));
if (type == null)
return null;

return reader_provider = (ISymbolReaderProvider) Activator.CreateInstance (type);
}

static string GetProviderTypeName (string name)
{
return "Mono.Cecil." + symbol_kind + "." + symbol_kind + name;
}

#if !READ_ONLY

static ISymbolWriterProvider writer_provider;

public static ISymbolWriterProvider GetPlatformWriterProvider ()
{
if (writer_provider != null)
return writer_provider;

var type = GetPlatformType (GetProviderTypeName ("WriterProvider"));
if (type == null)
return null;

return writer_provider = (ISymbolWriterProvider) Activator.CreateInstance (type);
}

#endif
}

#if !READ_ONLY

public interface ISymbolWriter : IDisposable {

bool GetDebugHeader (out ImageDebugDirectory directory, out byte [] header);
void Write (MethodBody body);
void Write (MethodSymbols symbols);
}

public interface ISymbolWriterProvider {

ISymbolWriter GetSymbolWriter (ModuleDefinition module, string fileName);
ISymbolWriter GetSymbolWriter (ModuleDefinition module, Stream symbolStream);
}

#endif
}
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