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//
// PerformRewrite.cs
//
// Authors:
// Chris Bacon (chrisbacon76@gmail.com)
//
// Copyright (C) 2010 Chris Bacon
//
// 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 System.Linq;
using System.Text;
using Mono.Cecil;
using Mono.Cecil.Cil;
using Mono.CodeContracts.Rewrite.Ast;
using Mono.CodeContracts.Rewrite.AstVisitors;
namespace Mono.CodeContracts.Rewrite {
class PerformRewrite {
public PerformRewrite (RewriterOptions options)
{
this.options = options;
}
private RewriterOptions options;
private Dictionary<MethodDefinition, TransformContractsVisitor> rewrittenMethods = new Dictionary<MethodDefinition, TransformContractsVisitor> ();
public void Rewrite (AssemblyDefinition assembly)
{
foreach (ModuleDefinition module in assembly.Modules) {
ContractsRuntime contractsRuntime = new ContractsRuntime(module, this.options);
var allMethods =
from type in module.Types
from method in type.Methods
select method;
foreach (MethodDefinition method in allMethods.ToArray ()) {
this.RewriteMethod (module, method, contractsRuntime);
}
}
}
private void RewriteMethod (ModuleDefinition module, MethodDefinition method, ContractsRuntime contractsRuntime)
{
if (this.rewrittenMethods.ContainsKey (method)) {
return;
}
var overridden = this.GetOverriddenMethod (method);
if (overridden != null) {
this.RewriteMethod (module, overridden, contractsRuntime);
}
bool anyRewrites = false;
var baseMethod = this.GetBaseOverriddenMethod (method);
if (baseMethod != method) {
// Contract inheritance must be used
var vOverriddenTransform = this.rewrittenMethods [baseMethod];
// Can be null if overriding an abstract method
if (vOverriddenTransform != null) {
if (this.options.Level >= 2) {
// Only insert re-written contracts if level >= 2
foreach (var inheritedRequires in vOverriddenTransform.ContractRequiresInfo) {
this.RewriteIL (method.Body, null, null, inheritedRequires.RewrittenExpr);
anyRewrites = true;
}
}
}
}
TransformContractsVisitor vTransform = null;
if (method.HasBody) {
vTransform = this.TransformContracts (module, method, contractsRuntime);
if (vTransform.ContractRequiresInfo.Any ()) {
anyRewrites = true;
}
}
this.rewrittenMethods.Add (method, vTransform);
if (anyRewrites) {
Console.WriteLine (method);
}
}
private TransformContractsVisitor TransformContracts (ModuleDefinition module, MethodDefinition method, ContractsRuntime contractsRuntime)
{
var body = method.Body;
Decompile decompile = new Decompile (module, method);
var decomp = decompile.Go ();
TransformContractsVisitor vTransform = new TransformContractsVisitor (module, method, decompile.Instructions, contractsRuntime);
vTransform.Visit (decomp);
foreach (var replacement in vTransform.ContractRequiresInfo) {
// Only insert re-written contracts if level >= 2
Expr rewritten = this.options.Level >= 2 ? replacement.RewrittenExpr : null;
this.RewriteIL (body, decompile.Instructions, replacement.OriginalExpr, rewritten);
}
return vTransform;
}
private void RewriteIL (MethodBody body, Dictionary<Expr,Instruction> instructionLookup, Expr remove, Expr insert)
{
var il = body.GetILProcessor ();
Instruction instInsertBefore;
if (remove != null) {
var vInstExtent = new InstructionExtentVisitor (instructionLookup);
vInstExtent.Visit (remove);
instInsertBefore = vInstExtent.Instructions.Last ().Next;
foreach (var instRemove in vInstExtent.Instructions) {
il.Remove (instRemove);
}
} else {
instInsertBefore = body.Instructions [0];
}
if (insert != null) {
var compiler = new CompileVisitor (il, instructionLookup, inst => il.InsertBefore (instInsertBefore, inst));
compiler.Visit (insert);
}
}
private MethodDefinition GetOverriddenMethod (MethodDefinition method)
{
if (method.IsNewSlot || !method.IsVirtual) {
return null;
}
var baseType = method.DeclaringType.BaseType;
if (baseType == null) {
return null;
}
var overridden = baseType.Resolve ().Methods.FirstOrDefault (x => x.Name == method.Name);
return overridden;
}
private MethodDefinition GetBaseOverriddenMethod (MethodDefinition method)
{
var overridden = method;
while (true) {
var overriddenTemp = this.GetOverriddenMethod (overridden);
if (overriddenTemp == null) {
return overridden;
}
overridden = overriddenTemp;
}
}
}
}
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