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AstBuilder.cs
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AstBuilder.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Ast = ICSharpCode.NRefactory.Ast;
using ICSharpCode.NRefactory.Ast;
using ICSharpCode.NRefactory.PrettyPrinter;
using Mono.Cecil;
using Mono.Cecil.Cil;
namespace Decompiler
{
public class AstBuilder
{
CompilationUnit astCompileUnit = new CompilationUnit();
Dictionary<string, NamespaceDeclaration> astNamespaces = new Dictionary<string, NamespaceDeclaration>();
public string GenerateCode()
{
CSharpOutputVisitor csOutVisitor = new CSharpOutputVisitor();
for (int i = 0; i < 4; i++) {
if (Options.ReduceAstJumps) {
astCompileUnit.AcceptVisitor(new Transforms.Ast.RemoveGotos(), null);
astCompileUnit.AcceptVisitor(new Transforms.Ast.RemoveDeadLabels(), null);
}
if (Options.ReduceAstLoops) {
astCompileUnit.AcceptVisitor(new Transforms.Ast.RestoreLoop(), null);
}
if (Options.ReduceAstOther) {
astCompileUnit.AcceptVisitor(new Transforms.Ast.Idioms(), null);
astCompileUnit.AcceptVisitor(new Transforms.Ast.RemoveEmptyElseBody(), null);
astCompileUnit.AcceptVisitor(new Transforms.Ast.PushNegation(), null);
astCompileUnit.AcceptVisitor(new Transforms.Ast.PushNegation(), null);
astCompileUnit.AcceptVisitor(new Transforms.Ast.PushNegation(), null);
}
}
if (Options.ReduceAstOther) {
astCompileUnit.AcceptVisitor(new Transforms.Ast.RemoveParenthesis(), null);
astCompileUnit.AcceptVisitor(new Transforms.Ast.RemoveParenthesis(), null);
astCompileUnit.AcceptVisitor(new Transforms.Ast.SimplifyTypeReferences(), null);
astCompileUnit.AcceptVisitor(new Transforms.Ast.Idioms(), null);
}
if (Options.ReduceAstLoops) {
astCompileUnit.AcceptVisitor(new Transforms.Ast.RestoreLoop(), null);
}
astCompileUnit.AcceptVisitor(csOutVisitor, null);
string code = csOutVisitor.Text;
for(int i = 10; i >= 0; i--) {
code = code.Replace("\r\n" + new string('\t', i) + "else {", " else {");
}
code = code.Replace("\t", " ");
code = code.Replace("\"/***", "");
code = code.Replace("***/\";", "");
// Post processing commands
while(true) {
int endIndex = code.IndexOf("[JoinLine]") + "[JoinLine]".Length;
if (endIndex != -1) {
int startIndex = code.LastIndexOf("\r\n", endIndex, endIndex);
if (startIndex != -1) {
code = code.Remove(startIndex, endIndex - startIndex);
continue;
}
}
break;
}
while(true) {
int endIndex = code.IndexOf("[Tab]");
if (endIndex != -1) {
int startIndex = code.LastIndexOf("\r\n", endIndex, endIndex);
if (startIndex != -1) {
code = code.Remove(endIndex, "[Tab]".Length);
code = code.Insert(endIndex, new string(' ', Math.Max(0, 40 - endIndex + startIndex)));
continue;
}
}
break;
}
return code;
}
public void AddAssembly(AssemblyDefinition assemblyDefinition)
{
Ast.UsingDeclaration astUsing = new Ast.UsingDeclaration("System");
astCompileUnit.Children.Add(astUsing);
foreach(TypeDefinition typeDef in assemblyDefinition.MainModule.Types) {
// Skip nested types - they will be added by the parent type
if (typeDef.DeclaringType != null) continue;
// Skip the <Module> class
if (typeDef.Name == "<Module>") continue;
AddType(typeDef);
}
}
NamespaceDeclaration GetCodeNamespace(string name)
{
if (string.IsNullOrEmpty(name)) {
return null;
}
if (astNamespaces.ContainsKey(name)) {
return astNamespaces[name];
} else {
// Create the namespace
NamespaceDeclaration astNamespace = new NamespaceDeclaration(name);
astCompileUnit.Children.Add(astNamespace);
astNamespaces[name] = astNamespace;
return astNamespace;
}
}
public void AddType(TypeDefinition typeDef)
{
if (!string.IsNullOrEmpty(Options.TypeFilter) && typeDef.Name != Options.TypeFilter) return;
TypeDeclaration astType = CreateType(typeDef);
NamespaceDeclaration astNS = GetCodeNamespace(typeDef.Namespace);
if (astNS != null) {
astNS.Children.Add(astType);
} else {
astCompileUnit.Children.Add(astType);
}
}
public TypeDeclaration CreateType(TypeDefinition typeDef)
{
TypeDeclaration astType = new TypeDeclaration(ConvertModifiers(typeDef), new List<AttributeSection>());
astType.Name = typeDef.Name;
if (typeDef.IsEnum) { // NB: Enum is value type
astType.Type = ClassType.Enum;
} else if (typeDef.IsValueType) {
astType.Type = ClassType.Struct;
} else if (typeDef.IsInterface) {
astType.Type = ClassType.Interface;
} else {
astType.Type = ClassType.Class;
}
// Nested types
foreach(TypeDefinition nestedTypeDef in typeDef.NestedTypes) {
astType.Children.Add(CreateType(nestedTypeDef));
}
// Base type
if (typeDef.BaseType != null && !typeDef.IsValueType && typeDef.BaseType.FullName != Constants.Object) {
astType.BaseTypes.Add(new Ast.TypeReference(typeDef.BaseType.FullName));
}
AddTypeMembers(astType, typeDef);
return astType;
}
Modifiers ConvertModifiers(TypeDefinition typeDef)
{
return
(typeDef.IsNestedPrivate ? Modifiers.Private : Modifiers.None) |
(typeDef.IsNestedFamilyAndAssembly ? Modifiers.Protected : Modifiers.None) | // TODO: Extended access
(typeDef.IsNestedAssembly ? Modifiers.Internal : Modifiers.None) |
(typeDef.IsNestedFamily ? Modifiers.Protected : Modifiers.None) |
(typeDef.IsNestedFamilyOrAssembly ? Modifiers.Protected | Modifiers.Internal : Modifiers.None) |
(typeDef.IsPublic ? Modifiers.Public : Modifiers.None) |
(typeDef.IsAbstract ? Modifiers.Abstract : Modifiers.None);
}
Modifiers ConvertModifiers(FieldDefinition fieldDef)
{
return
(fieldDef.IsPrivate ? Modifiers.Private : Modifiers.None) |
(fieldDef.IsFamilyAndAssembly ? Modifiers.Protected : Modifiers.None) | // TODO: Extended access
(fieldDef.IsAssembly ? Modifiers.Internal : Modifiers.None) |
(fieldDef.IsFamily ? Modifiers.Protected : Modifiers.None) |
(fieldDef.IsFamilyOrAssembly ? Modifiers.Protected | Modifiers.Internal : Modifiers.None) |
(fieldDef.IsPublic ? Modifiers.Public : Modifiers.None) |
(fieldDef.IsLiteral ? Modifiers.Const : Modifiers.None) |
(fieldDef.IsStatic ? Modifiers.Static : Modifiers.None);
}
Modifiers ConvertModifiers(MethodDefinition methodDef)
{
return
(methodDef.IsCompilerControlled ? Modifiers.None : Modifiers.None) |
(methodDef.IsPrivate ? Modifiers.Private : Modifiers.None) |
(methodDef.IsFamilyAndAssembly ? Modifiers.Protected : Modifiers.None) | // TODO: Extended access
(methodDef.IsAssembly ? Modifiers.Internal : Modifiers.None) |
(methodDef.IsFamily ? Modifiers.Protected : Modifiers.None) |
(methodDef.IsFamilyOrAssembly ? Modifiers.Protected | Modifiers.Internal : Modifiers.None) |
(methodDef.IsPublic ? Modifiers.Public : Modifiers.None) |
(methodDef.IsStatic ? Modifiers.Static : Modifiers.None) |
(methodDef.IsVirtual ? Modifiers.Virtual : Modifiers.None) |
(methodDef.IsAbstract ? Modifiers.Abstract : Modifiers.None);
}
void AddTypeMembers(TypeDeclaration astType, TypeDefinition typeDef)
{
// Add fields
foreach(FieldDefinition fieldDef in typeDef.Fields) {
Ast.FieldDeclaration astField = new Ast.FieldDeclaration(new List<AttributeSection>());
astField.Fields.Add(new Ast.VariableDeclaration(fieldDef.Name));
astField.TypeReference = new Ast.TypeReference(fieldDef.FieldType.FullName);
astField.Modifier = ConvertModifiers(fieldDef);
astType.Children.Add(astField);
}
if (typeDef.Fields.Count > 0) {
astType.Children.Add(new IdentifierExpression("\r\n"));
}
// Add events
foreach(EventDefinition eventDef in typeDef.Events) {
Ast.EventDeclaration astEvent = new Ast.EventDeclaration();
astEvent.Name = eventDef.Name;
astEvent.TypeReference = new Ast.TypeReference(eventDef.EventType.FullName);
astEvent.Modifier = ConvertModifiers(eventDef.AddMethod);
astType.Children.Add(astEvent);
}
if (typeDef.Events.Count > 0) {
astType.Children.Add(new IdentifierExpression("\r\n"));
}
// Add properties
foreach(PropertyDefinition propDef in typeDef.Properties) {
Ast.PropertyDeclaration astProp = new Ast.PropertyDeclaration(
ConvertModifiers(propDef.GetMethod),
new List<AttributeSection>(),
propDef.Name,
new List<ParameterDeclarationExpression>()
);
astProp.TypeReference = new Ast.TypeReference(propDef.PropertyType.FullName);
if (propDef.GetMethod != null) {
astProp.GetRegion = new PropertyGetRegion(
AstMetodBodyBuilder.CreateMetodBody(propDef.GetMethod),
new List<AttributeSection>()
);
}
if (propDef.SetMethod != null) {
astProp.SetRegion = new PropertySetRegion(
AstMetodBodyBuilder.CreateMetodBody(propDef.SetMethod),
new List<AttributeSection>()
);
}
astType.Children.Add(astProp);
}
if (typeDef.Properties.Count > 0) {
astType.Children.Add(new IdentifierExpression("\r\n"));
}
// Add constructors
foreach(MethodDefinition methodDef in typeDef.Methods) {
if (!methodDef.IsConstructor) continue;
Ast.ConstructorDeclaration astMethod = new Ast.ConstructorDeclaration(
methodDef.Name,
ConvertModifiers(methodDef),
new List<ParameterDeclarationExpression>(MakeParameters(methodDef.Parameters)),
new List<AttributeSection>()
);
astMethod.Body = AstMetodBodyBuilder.CreateMetodBody(methodDef);
astType.Children.Add(astMethod);
astType.Children.Add(new IdentifierExpression("\r\n"));
}
// Add methods
foreach(MethodDefinition methodDef in typeDef.Methods) {
if (methodDef.IsSpecialName) continue;
Ast.MethodDeclaration astMethod = new Ast.MethodDeclaration();
astMethod.Name = methodDef.Name;
astMethod.TypeReference = new Ast.TypeReference(methodDef.ReturnType.FullName);
astMethod.Modifier = ConvertModifiers(methodDef);
astMethod.Parameters.AddRange(MakeParameters(methodDef.Parameters));
astMethod.Body = AstMetodBodyBuilder.CreateMetodBody(methodDef);
astType.Children.Add(astMethod);
astType.Children.Add(new IdentifierExpression("\r\n"));
}
if (astType.Children.LastOrDefault() is IdentifierExpression) {
astType.Children.Last.Remove();
}
}
IEnumerable<Ast.ParameterDeclarationExpression> MakeParameters(IEnumerable<ParameterDefinition> paramCol)
{
foreach(ParameterDefinition paramDef in paramCol) {
Ast.ParameterDeclarationExpression astParam = new Ast.ParameterDeclarationExpression(
new Ast.TypeReference(paramDef.ParameterType.FullName),
paramDef.Name
);
if (paramDef.IsIn && !paramDef.IsOut) astParam.ParamModifier = ParameterModifiers.In;
if (!paramDef.IsIn && paramDef.IsOut) astParam.ParamModifier = ParameterModifiers.Out;
if (paramDef.IsIn && paramDef.IsOut) astParam.ParamModifier = ParameterModifiers.Ref;
yield return astParam;
}
}
}
}