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using System;
using System.Linq;
using Mono.Cecil;
using Mono.Cecil.Cil;
using NUnit.Framework;
namespace Mono.Cecil.Tests {
[TestFixture]
public class ILProcessorTests : BaseTestFixture {
[Test]
public void Append ()
{
var method = CreateTestMethod ();
var il = method.GetILProcessor ();
var ret = il.Create (OpCodes.Ret);
il.Append (ret);
AssertOpCodeSequence (new [] { OpCodes.Ret }, method);
}
[Test]
public void InsertBefore ()
{
var method = CreateTestMethod (OpCodes.Ldloc_0, OpCodes.Ldloc_2, OpCodes.Ldloc_3);
var il = method.GetILProcessor ();
var ldloc_2 = method.Instructions.Where (i => i.OpCode == OpCodes.Ldloc_2).First ();
il.InsertBefore (
ldloc_2,
il.Create (OpCodes.Ldloc_1));
AssertOpCodeSequence (new [] { OpCodes.Ldloc_0, OpCodes.Ldloc_1, OpCodes.Ldloc_2, OpCodes.Ldloc_3 }, method);
}
[Test]
public void InsertAfter ()
{
var method = CreateTestMethod (OpCodes.Ldloc_0, OpCodes.Ldloc_2, OpCodes.Ldloc_3);
var il = method.GetILProcessor ();
var ldloc_0 = method.Instructions.First ();
il.InsertAfter (
ldloc_0,
il.Create (OpCodes.Ldloc_1));
AssertOpCodeSequence (new [] { OpCodes.Ldloc_0, OpCodes.Ldloc_1, OpCodes.Ldloc_2, OpCodes.Ldloc_3 }, method);
}
[Test]
public void InsertAfterUsingIndex ()
{
var method = CreateTestMethod (OpCodes.Ldloc_0, OpCodes.Ldloc_2, OpCodes.Ldloc_3);
var il = method.GetILProcessor ();
il.InsertAfter (
0,
il.Create (OpCodes.Ldloc_1));
AssertOpCodeSequence (new [] { OpCodes.Ldloc_0, OpCodes.Ldloc_1, OpCodes.Ldloc_2, OpCodes.Ldloc_3 }, method);
}
[Test]
public void InsertAfterWithLocalScopes ()
{
var method = CreateTestMethodWithLocalScopes ();
var il = method.GetILProcessor ();
il.InsertAfter (
0,
il.Create (OpCodes.Nop));
AssertOpCodeSequence (new [] { OpCodes.Ldloc_0, OpCodes.Nop, OpCodes.Ldloc_1, OpCodes.Ldloc_2 }, method);
var wholeBodyScope = VerifyWholeBodyScope (method);
AssertLocalScope (wholeBodyScope.Scopes [0], 0, 2);
AssertLocalScope (wholeBodyScope.Scopes [1], 2, 3);
AssertLocalScope (wholeBodyScope.Scopes [2], 3, null);
}
[Test]
public void ReplaceUsingIndex ()
{
var method = CreateTestMethod (OpCodes.Ldloc_0, OpCodes.Ldloc_2, OpCodes.Ldloc_3);
var il = method.GetILProcessor ();
il.Replace (1, il.Create (OpCodes.Nop));
AssertOpCodeSequence (new [] { OpCodes.Ldloc_0, OpCodes.Nop, OpCodes.Ldloc_3 }, method);
}
[Test]
public void ReplaceWithLocalScopes ()
{
var method = CreateTestMethodWithLocalScopes ();
var il = method.GetILProcessor ();
// Replace with larger instruction
var instruction = il.Create (OpCodes.Ldstr, "test");
instruction.Offset = method.Instructions [1].Offset;
il.Replace (1, instruction);
AssertOpCodeSequence (new [] { OpCodes.Ldloc_0, OpCodes.Ldstr, OpCodes.Ldloc_2 }, method);
var wholeBodyScope = VerifyWholeBodyScope (method);
AssertLocalScope (wholeBodyScope.Scopes [0], 0, 1);
AssertLocalScope (wholeBodyScope.Scopes [1], 1, 6); // size of the new instruction is 5 bytes
AssertLocalScope (wholeBodyScope.Scopes [2], 6, null);
}
[Test]
public void Clear ()
{
var method = CreateTestMethod (OpCodes.Ldloc_0, OpCodes.Ldloc_2, OpCodes.Ldloc_3);
var il = method.GetILProcessor ();
il.Clear ();
AssertOpCodeSequence (new OpCode[] { }, method);
}
static void AssertOpCodeSequence (OpCode [] expected, MethodBody body)
{
var opcodes = body.Instructions.Select (i => i.OpCode).ToArray ();
Assert.AreEqual (expected.Length, opcodes.Length);
for (int i = 0; i < opcodes.Length; i++)
Assert.AreEqual (expected [i], opcodes [i]);
}
static MethodBody CreateTestMethod (params OpCode [] opcodes)
{
var method = new MethodDefinition {
Name = "function",
};
var il = method.Body.GetILProcessor ();
foreach (var opcode in opcodes)
il.Emit (opcode);
var instructions = method.Body.Instructions;
int size = 0;
for (int i = 0; i < instructions.Count; i++) {
var instruction = instructions [i];
instruction.Offset = size;
size += instruction.GetSize ();
}
return method.Body;
}
static ScopeDebugInformation VerifyWholeBodyScope (MethodBody body)
{
var debug_info = body.Method.DebugInformation;
Assert.IsNotNull (debug_info);
AssertLocalScope (debug_info.Scope, 0, null);
return debug_info.Scope;
}
static void AssertLocalScope (ScopeDebugInformation scope, int startOffset, int? endOffset)
{
Assert.IsNotNull (scope);
Assert.AreEqual (startOffset, scope.Start.Offset);
if (endOffset.HasValue)
Assert.AreEqual (endOffset.Value, scope.End.Offset);
else
Assert.IsTrue (scope.End.IsEndOfMethod);
}
static MethodBody CreateTestMethodWithLocalScopes ()
{
var methodBody = CreateTestMethod (OpCodes.Ldloc_0, OpCodes.Ldloc_1, OpCodes.Ldloc_2);
var method = methodBody.Method;
var debug_info = method.DebugInformation;
var wholeBodyScope = new ScopeDebugInformation () {
Start = new InstructionOffset (0),
End = new InstructionOffset ()
};
int size = 0;
var instruction = methodBody.Instructions [0];
var innerScopeBegining = new ScopeDebugInformation () {
Start = new InstructionOffset (size),
End = new InstructionOffset (size + instruction.GetSize ())
};
size += instruction.GetSize ();
wholeBodyScope.Scopes.Add (innerScopeBegining);
instruction = methodBody.Instructions [1];
var innerScopeMiddle = new ScopeDebugInformation () {
Start = new InstructionOffset (size),
End = new InstructionOffset (size + instruction.GetSize ())
};
size += instruction.GetSize ();
wholeBodyScope.Scopes.Add (innerScopeMiddle);
var innerScopeEnd = new ScopeDebugInformation () {
Start = new InstructionOffset (size),
End = new InstructionOffset ()
};
wholeBodyScope.Scopes.Add (innerScopeEnd);
debug_info.Scope = wholeBodyScope;
return methodBody;
}
}
}
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