/// <summary>
/// Inline the call to the given method
/// </summary>
private static void InlineCall(Instruction instruction, MethodBody body, MethodDefinition targetMethod)
{
// Prepare
var prefixSeq = new ILSequence();
// Create "this" variable
VariableDefinition thisVariable = null;
if (targetMethod.HasThis)
{
thisVariable = new VariableDefinition(targetMethod.DeclaringType);
body.Variables.Add(thisVariable);
body.InitLocals = true;
}
// Store argument in variables
var paramVariables = new List <VariableDefinition>();
foreach (var parameter in targetMethod.Parameters.Reverse())
{
// Create variable
var paramVariable = new VariableDefinition(parameter.ParameterType);
body.Variables.Add(paramVariable);
paramVariables.Insert(0, paramVariable);
// Pop
prefixSeq.Emit(OpCodes.Stloc, paramVariable);
}
// Store this argument (if any)
if (thisVariable != null)
{
// Pop
prefixSeq.Emit(OpCodes.Stloc, thisVariable);
}
// Clone variables first
var source = targetMethod.Body;
var variables = new List <VariableDefinition>();
foreach (var sv in source.Variables)
{
var clone = new VariableDefinition(sv.VariableType);
variables.Add(clone);
body.Variables.Add(clone);
}
// Now clone instructions
var seq = new ILSequence();
foreach (var instr in source.Instructions)
{
var ni = new Instruction(instr.OpCode, instr.Operand);
seq.Append(ni);
ni.Offset = instr.Offset;
// Convert variable opcodes
switch (instr.OpCode.OperandType)
{
case OperandType.InlineVar:
case OperandType.ShortInlineVar:
{
var index = source.Variables.IndexOf((VariableDefinition)instr.Operand);
ni.Operand = variables[index];
}
break;
}
// Convert parameter opcodes
switch (instr.OpCode.Code)
{
case Code.Ldarg:
{
var index = targetMethod.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Ldloc;
}
break;
case Code.Ldarga:
{
var index = targetMethod.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Ldloca;
}
break;
case Code.Starg:
{
var index = targetMethod.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Stloc;
}
break;
}
}
// Update branch targets
for (var i = 0; i < seq.Length; i++)
{
var instr = seq[i];
var oldi = source.Instructions[i];
if (instr.OpCode.OperandType == OperandType.InlineSwitch)
{
var olds = (Instruction[])oldi.Operand;
var targets = new Instruction[olds.Length];
for (int j = 0; j < targets.Length; j++)
{
targets[j] = GetClone(seq, source.Instructions, olds[j]);
}
instr.Operand = targets;
}
else if (instr.OpCode.OperandType == OperandType.ShortInlineBrTarget ||
instr.OpCode.OperandType == OperandType.InlineBrTarget)
{
instr.Operand = GetClone(seq, source.Instructions, (Instruction)oldi.Operand);
}
}
// Clone exception handlers
if (source.HasExceptionHandlers)
{
body.ComputeOffsets();
CloneInstructions(seq, source.Instructions, body.ExceptionHandlers, source.ExceptionHandlers);
}
// Replace ret instructions
var end = seq.Emit(OpCodes.Nop);
var retInstructions = seq.Where(x => x.OpCode.Code == Code.Ret).ToList();
foreach (var ins in retInstructions)
{
ins.OpCode = OpCodes.Br;
ins.Operand = end;
}
// cast return type of a generic method. TODO: better might be to
// correctly resolve calls to generic instances as well (above)
if (targetMethod.ReturnType.IsGenericParameter)
{
var methodRef = (MethodReference)instruction.Operand;
TypeReference returnType = null;
var gp = (GenericParameter)methodRef.ReturnType;
if (gp.Type == GenericParameterType.Type)
{
var gi = methodRef.DeclaringType as IGenericInstance;
if (gi != null && gi.HasGenericArguments)
{
returnType = gi.GenericArguments[gp.Position];
}
}
else if (gp.Type == GenericParameterType.Method)
{
var gi = methodRef as IGenericInstance;
if (gi != null && gi.HasGenericArguments)
{
returnType = gi.GenericArguments[gp.Position];
}
}
if (returnType != null)
{
if (!returnType.IsPrimitive)
{
seq.Emit(OpCodes.Castclass, returnType);
}
// todo: handle primitive types. unbox them? are structs correctly handled? enums?
}
}
// Insert cloned instructions
prefixSeq.InsertTo(0, seq);
seq.InsertToAfter(instruction, body);
// Change replaced instruction to nop
instruction.ChangeToNop();
// Update offsets
body.ComputeOffsets();
}
/// <summary>
/// Inline the call to the given ctor
/// </summary>
private static void InlineNewObjCall(Instruction instruction, MethodBody body, MethodDefinition ctor)
{
// Prepare
var prefixSeq = new ILSequence();
ctor.Body.SimplifyMacros();
// Create "this" variable
var thisVariable = new VariableDefinition(ctor.DeclaringType);
body.Variables.Add(thisVariable);
body.InitLocals = true;
// Store argument in variables
var paramVariables = new List <VariableDefinition>();
foreach (var parameter in ctor.Parameters.Reverse())
{
// Create variable
var paramVariable = new VariableDefinition(parameter.ParameterType);
body.Variables.Add(paramVariable);
paramVariables.Insert(0, paramVariable);
// Pop
prefixSeq.Emit(OpCodes.Stloc, paramVariable);
}
// Clone variables first
var source = ctor.Body;
var variables = new List <VariableDefinition>();
foreach (var sv in source.Variables)
{
var clone = new VariableDefinition(sv.VariableType);
variables.Add(clone);
body.Variables.Add(clone);
}
// Now clone instructions
var seq = new ILSequence();
foreach (var instr in source.Instructions)
{
var ni = new Instruction(instr.OpCode, instr.Operand);
seq.Append(ni);
ni.Offset = instr.Offset;
// Convert variable opcodes
switch (instr.OpCode.OperandType)
{
case OperandType.InlineVar:
case OperandType.ShortInlineVar:
{
var index = source.Variables.IndexOf((VariableDefinition)instr.Operand);
ni.Operand = variables[index];
}
break;
}
// Convert parameter opcodes
switch (instr.OpCode.Code)
{
case Mono.Cecil.Cil.Code.Ldarg:
{
var index = ctor.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Ldloc;
}
break;
case Mono.Cecil.Cil.Code.Ldarga:
{
var index = ctor.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Ldloca;
}
break;
case Mono.Cecil.Cil.Code.Starg:
{
var index = ctor.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Stloc;
}
break;
}
}
// Update branch targets
for (var i = 0; i < seq.Length; i++)
{
var instr = seq[i];
var oldi = source.Instructions[i];
if (instr.OpCode.OperandType == OperandType.InlineSwitch)
{
var olds = (Instruction[])oldi.Operand;
var targets = new Instruction[olds.Length];
for (int j = 0; j < targets.Length; j++)
{
targets[j] = GetClone(seq, source.Instructions, olds[j]);
}
instr.Operand = targets;
}
else if (instr.OpCode.OperandType == OperandType.ShortInlineBrTarget ||
instr.OpCode.OperandType == OperandType.InlineBrTarget)
{
instr.Operand = GetClone(seq, source.Instructions, (Instruction)oldi.Operand);
}
}
// Clone exception handlers
if (source.HasExceptionHandlers)
{
CloneInstructions(seq, source.Instructions, body.ExceptionHandlers, source.ExceptionHandlers);
}
// Find call to "this" ctor
var callToCtors = seq.Where(x => IsCallToThisCtor(x, ctor)).ToList();
if (callToCtors.Count == 0)
{
throw new CompilerException(string.Format("No call to another this ctor found in {0}", ctor));
}
if (callToCtors.Count > 1)
{
throw new CompilerException(string.Format("Multiple calls to another this ctor found in {0}", ctor));
}
var callToCtor = callToCtors[0];
// Change "ld this" to nop
var args = callToCtor.GetCallArguments(seq, true);
args[0].ChangeToNop(); // Replace ldarg.0
// Replace call to this ctor with newobj
var callSeq = new ILSequence();
callSeq.Emit(OpCodes.Newobj, (MethodReference)callToCtor.Operand);
callSeq.Emit(OpCodes.Stloc, thisVariable); // Save new object
callToCtor.ChangeToNop();
callSeq.InsertToBefore(callToCtor, seq);
// Replace ret instructions
var end = seq.Emit(OpCodes.Ldloc, thisVariable);
var retInstructions = seq.Where(x => x.OpCode.Code == Mono.Cecil.Cil.Code.Ret).ToList();
foreach (var ins in retInstructions)
{
ins.OpCode = OpCodes.Br;
ins.Operand = end;
}
// Insert cloned instructions
prefixSeq.InsertTo(0, seq);
seq.InsertToAfter(instruction, body);
// Change replaced instruction to nop
instruction.ChangeToNop();
// Update offsets
body.ComputeOffsets();
}
/// <summary>
/// Inline the call to the given method
/// </summary>
private static void InlineCall(Instruction instruction, MethodBody body, MethodDefinition targetMethod)
{
// Prepare
var prefixSeq = new ILSequence();
// Create "this" variable
VariableDefinition thisVariable = null;
if (targetMethod.HasThis)
{
thisVariable = new VariableDefinition(targetMethod.DeclaringType);
body.Variables.Add(thisVariable);
body.InitLocals = true;
}
// Store argument in variables
var paramVariables = new List <VariableDefinition>();
foreach (var parameter in targetMethod.Parameters.Reverse())
{
// Create variable
var paramVariable = new VariableDefinition(parameter.ParameterType);
body.Variables.Add(paramVariable);
paramVariables.Insert(0, paramVariable);
// Pop
prefixSeq.Emit(OpCodes.Stloc, paramVariable);
}
// Store this argument (if any)
if (thisVariable != null)
{
// Pop
prefixSeq.Emit(OpCodes.Stloc, thisVariable);
}
// Clone variables first
var source = targetMethod.Body;
var variables = new List <VariableDefinition>();
foreach (var sv in source.Variables)
{
var clone = new VariableDefinition(sv.VariableType);
variables.Add(clone);
body.Variables.Add(clone);
}
// Now clone instructions
var seq = new ILSequence();
foreach (var instr in source.Instructions)
{
var ni = new Instruction(instr.OpCode, instr.Operand);
seq.Append(ni);
ni.Offset = instr.Offset;
// Convert variable opcodes
switch (instr.OpCode.OperandType)
{
case OperandType.InlineVar:
case OperandType.ShortInlineVar:
{
var index = source.Variables.IndexOf((VariableDefinition)instr.Operand);
ni.Operand = variables[index];
}
break;
}
// Convert parameter opcodes
switch (instr.OpCode.Code)
{
case Code.Ldarg:
{
var index = targetMethod.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Ldloc;
}
break;
case Code.Ldarga:
{
var index = targetMethod.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Ldloca;
}
break;
case Code.Starg:
{
var index = targetMethod.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Stloc;
}
break;
}
}
// Update branch targets
for (var i = 0; i < seq.Length; i++)
{
var instr = seq[i];
var oldi = source.Instructions[i];
if (instr.OpCode.OperandType == OperandType.InlineSwitch)
{
var olds = (Instruction[])oldi.Operand;
var targets = new Instruction[olds.Length];
for (int j = 0; j < targets.Length; j++)
{
targets[j] = GetClone(seq, source.Instructions, olds[j]);
}
instr.Operand = targets;
}
else if (instr.OpCode.OperandType == OperandType.ShortInlineBrTarget ||
instr.OpCode.OperandType == OperandType.InlineBrTarget)
{
instr.Operand = GetClone(seq, source.Instructions, (Instruction)oldi.Operand);
}
}
// Clone exception handlers
if (source.HasExceptionHandlers)
{
body.ComputeOffsets();
CloneInstructions(seq, source.Instructions, body.ExceptionHandlers, source.ExceptionHandlers);
}
// Replace ret instructions
var end = seq.Emit(OpCodes.Nop);
var retInstructions = seq.Where(x => x.OpCode.Code == Code.Ret).ToList();
foreach (var ins in retInstructions)
{
ins.OpCode = OpCodes.Br;
ins.Operand = end;
}
// Insert cloned instructions
prefixSeq.InsertTo(0, seq);
seq.InsertToAfter(instruction, body);
// Change replaced instruction to nop
instruction.ChangeToNop();
// Update offsets
body.ComputeOffsets();
}
/// <summary>
/// Inline the call to the given ctor
/// </summary>
private static void InlineNewObjCall(Instruction instruction, MethodBody body, MethodDefinition ctor)
{
// Prepare
var prefixSeq = new ILSequence();
ctor.Body.SimplifyMacros();
// Create "this" variable
var thisVariable = new VariableDefinition(ctor.DeclaringType);
body.Variables.Add(thisVariable);
body.InitLocals = true;
// Store argument in variables
var paramVariables = new List<VariableDefinition>();
foreach (var parameter in ctor.Parameters.Reverse())
{
// Create variable
var paramVariable = new VariableDefinition(parameter.ParameterType);
body.Variables.Add(paramVariable);
paramVariables.Insert(0, paramVariable);
// Pop
prefixSeq.Emit(OpCodes.Stloc, paramVariable);
}
// Clone variables first
var source = ctor.Body;
var variables = new List<VariableDefinition>();
foreach (var sv in source.Variables)
{
var clone = new VariableDefinition(sv.VariableType);
variables.Add(clone);
body.Variables.Add(clone);
}
// Now clone instructions
var seq = new ILSequence();
foreach (var instr in source.Instructions)
{
var ni = new Instruction(instr.OpCode, instr.Operand);
seq.Append(ni);
ni.Offset = instr.Offset;
// Convert variable opcodes
switch (instr.OpCode.OperandType)
{
case OperandType.InlineVar:
case OperandType.ShortInlineVar:
{
var index = source.Variables.IndexOf((VariableDefinition) instr.Operand);
ni.Operand = variables[index];
}
break;
}
// Convert parameter opcodes
switch (instr.OpCode.Code)
{
case Mono.Cecil.Cil.Code.Ldarg:
{
var index = ctor.Parameters.IndexOf((ParameterDefinition) instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Ldloc;
}
break;
case Mono.Cecil.Cil.Code.Ldarga:
{
var index = ctor.Parameters.IndexOf((ParameterDefinition) instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Ldloca;
}
break;
case Mono.Cecil.Cil.Code.Starg:
{
var index = ctor.Parameters.IndexOf((ParameterDefinition) instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Stloc;
}
break;
}
}
// Update branch targets
for (var i = 0; i < seq.Length; i++)
{
var instr = seq[i];
var oldi = source.Instructions[i];
if (instr.OpCode.OperandType == OperandType.InlineSwitch)
{
var olds = (Instruction[]) oldi.Operand;
var targets = new Instruction[olds.Length];
for (int j = 0; j < targets.Length; j++)
{
targets[j] = GetClone(seq, source.Instructions, olds[j]);
}
instr.Operand = targets;
}
else if (instr.OpCode.OperandType == OperandType.ShortInlineBrTarget ||
instr.OpCode.OperandType == OperandType.InlineBrTarget)
{
instr.Operand = GetClone(seq, source.Instructions, (Instruction) oldi.Operand);
}
}
// Clone exception handlers
if (source.HasExceptionHandlers)
{
CloneInstructions(seq, source.Instructions, body.ExceptionHandlers, source.ExceptionHandlers);
}
// Find call to "this" ctor
var callToCtors = seq.Where(x => IsCallToThisCtor(x, ctor)).ToList();
if (callToCtors.Count == 0)
throw new CompilerException(string.Format("No call to another this ctor found in {0}", ctor));
if (callToCtors.Count > 1)
throw new CompilerException(string.Format("Multiple calls to another this ctor found in {0}", ctor));
var callToCtor = callToCtors[0];
// Change "ld this" to nop
var args = callToCtor.GetCallArguments(seq, true);
args[0].ChangeToNop(); // Replace ldarg.0
// Replace call to this ctor with newobj
var callSeq = new ILSequence();
callSeq.Emit(OpCodes.Newobj, (MethodReference) callToCtor.Operand);
callSeq.Emit(OpCodes.Stloc, thisVariable); // Save new object
callToCtor.ChangeToNop();
callSeq.InsertToBefore(callToCtor, seq);
// Replace ret instructions
var end = seq.Emit(OpCodes.Ldloc, thisVariable);
var retInstructions = seq.Where(x => x.OpCode.Code == Mono.Cecil.Cil.Code.Ret).ToList();
foreach (var ins in retInstructions)
{
ins.OpCode = OpCodes.Br;
ins.Operand = end;
}
// Insert cloned instructions
prefixSeq.InsertTo(0, seq);
seq.InsertToAfter(instruction, body);
// Change replaced instruction to nop
instruction.ChangeToNop();
// Update offsets
body.ComputeOffsets();
}
/// <summary>
/// Inline the call to the given method
/// </summary>
private static void InlineCall(Instruction instruction, MethodBody body, MethodDefinition targetMethod)
{
// Prepare
var prefixSeq = new ILSequence();
// Create "this" variable
VariableDefinition thisVariable = null;
if (targetMethod.HasThis)
{
thisVariable = new VariableDefinition(targetMethod.DeclaringType);
body.Variables.Add(thisVariable);
body.InitLocals = true;
}
// Store argument in variables
var paramVariables = new List<VariableDefinition>();
foreach (var parameter in targetMethod.Parameters.Reverse())
{
// Create variable
var paramVariable = new VariableDefinition(parameter.ParameterType);
body.Variables.Add(paramVariable);
paramVariables.Insert(0, paramVariable);
// Pop
prefixSeq.Emit(OpCodes.Stloc, paramVariable);
}
// Store this argument (if any)
if (thisVariable != null)
{
// Pop
prefixSeq.Emit(OpCodes.Stloc, thisVariable);
}
// Clone variables first
var source = targetMethod.Body;
var variables = new List<VariableDefinition>();
foreach (var sv in source.Variables)
{
var clone = new VariableDefinition(sv.VariableType);
variables.Add(clone);
body.Variables.Add(clone);
}
// Now clone instructions
var seq = new ILSequence();
foreach (var instr in source.Instructions)
{
var ni = new Instruction(instr.OpCode, instr.Operand);
seq.Append(ni);
ni.Offset = instr.Offset;
// Convert variable opcodes
switch (instr.OpCode.OperandType)
{
case OperandType.InlineVar:
case OperandType.ShortInlineVar:
{
var index = source.Variables.IndexOf((VariableDefinition)instr.Operand);
ni.Operand = variables[index];
}
break;
}
// Convert parameter opcodes
switch (instr.OpCode.Code)
{
case Code.Ldarg:
{
var index = targetMethod.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Ldloc;
}
break;
case Code.Ldarga:
{
var index = targetMethod.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Ldloca;
}
break;
case Code.Starg:
{
var index = targetMethod.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Stloc;
}
break;
}
}
// Update branch targets
for (var i = 0; i < seq.Length; i++)
{
var instr = seq[i];
var oldi = source.Instructions[i];
if (instr.OpCode.OperandType == OperandType.InlineSwitch)
{
var olds = (Instruction[])oldi.Operand;
var targets = new Instruction[olds.Length];
for (int j = 0; j < targets.Length; j++)
{
targets[j] = GetClone(seq, source.Instructions, olds[j]);
}
instr.Operand = targets;
}
else if (instr.OpCode.OperandType == OperandType.ShortInlineBrTarget ||
instr.OpCode.OperandType == OperandType.InlineBrTarget)
{
instr.Operand = GetClone(seq, source.Instructions, (Instruction)oldi.Operand);
}
}
// Clone exception handlers
if (source.HasExceptionHandlers)
{
body.ComputeOffsets();
CloneInstructions(seq, source.Instructions, body.ExceptionHandlers, source.ExceptionHandlers);
}
// Replace ret instructions
var end = seq.Emit(OpCodes.Nop);
var retInstructions = seq.Where(x => x.OpCode.Code == Code.Ret).ToList();
foreach (var ins in retInstructions)
{
ins.OpCode = OpCodes.Br;
ins.Operand = end;
}
// cast return type of a generic method. TODO: better might be to
// correctly resolve calls to generic instances as well (above)
if (targetMethod.ReturnType.IsGenericParameter)
{
var methodRef = (MethodReference)instruction.Operand;
TypeReference returnType = null;
var gp = (GenericParameter)methodRef.ReturnType;
if (gp.Type == GenericParameterType.Type)
{
var gi = methodRef.DeclaringType as IGenericInstance;
if (gi != null && gi.HasGenericArguments)
returnType = gi.GenericArguments[gp.Position];
}
else if (gp.Type == GenericParameterType.Method)
{
var gi = methodRef as IGenericInstance;
if (gi != null && gi.HasGenericArguments)
returnType = gi.GenericArguments[gp.Position];
}
if (returnType != null)
{
if (!returnType.IsPrimitive)
{
seq.Emit(OpCodes.Castclass, returnType);
}
// todo: handle primitive types. unbox them? are structs correctly handled? enums?
}
}
// Insert cloned instructions
prefixSeq.InsertTo(0, seq);
seq.InsertToAfter(instruction, body);
// Change replaced instruction to nop
instruction.ChangeToNop();
// Update offsets
body.ComputeOffsets();
}
/// <summary>
/// Inline the call to the given method
/// </summary>
private static void InlineCall(Instruction instruction, MethodBody body, MethodDefinition targetMethod)
{
// Prepare
var prefixSeq = new ILSequence();
// Create "this" variable
VariableDefinition thisVariable = null;
if (targetMethod.HasThis)
{
thisVariable = new VariableDefinition(targetMethod.DeclaringType);
body.Variables.Add(thisVariable);
body.InitLocals = true;
}
// Store argument in variables
var paramVariables = new List<VariableDefinition>();
foreach (var parameter in targetMethod.Parameters.Reverse())
{
// Create variable
var paramVariable = new VariableDefinition(parameter.ParameterType);
body.Variables.Add(paramVariable);
paramVariables.Insert(0, paramVariable);
// Pop
prefixSeq.Emit(OpCodes.Stloc, paramVariable);
}
// Store this argument (if any)
if (thisVariable != null)
{
// Pop
prefixSeq.Emit(OpCodes.Stloc, thisVariable);
}
// Clone variables first
var source = targetMethod.Body;
var variables = new List<VariableDefinition>();
foreach (var sv in source.Variables)
{
var clone = new VariableDefinition(sv.VariableType);
variables.Add(clone);
body.Variables.Add(clone);
}
// Now clone instructions
var seq = new ILSequence();
foreach (var instr in source.Instructions)
{
var ni = new Instruction(instr.OpCode, instr.Operand);
seq.Append(ni);
ni.Offset = instr.Offset;
// Convert variable opcodes
switch (instr.OpCode.OperandType)
{
case OperandType.InlineVar:
case OperandType.ShortInlineVar:
{
var index = source.Variables.IndexOf((VariableDefinition)instr.Operand);
ni.Operand = variables[index];
}
break;
}
// Convert parameter opcodes
switch (instr.OpCode.Code)
{
case Code.Ldarg:
{
var index = targetMethod.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Ldloc;
}
break;
case Code.Ldarga:
{
var index = targetMethod.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Ldloca;
}
break;
case Code.Starg:
{
var index = targetMethod.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = (index >= 0) ? paramVariables[index] : thisVariable;
ni.OpCode = OpCodes.Stloc;
}
break;
}
}
// Update branch targets
for (var i = 0; i < seq.Length; i++)
{
var instr = seq[i];
var oldi = source.Instructions[i];
if (instr.OpCode.OperandType == OperandType.InlineSwitch)
{
var olds = (Instruction[])oldi.Operand;
var targets = new Instruction[olds.Length];
for (int j = 0; j < targets.Length; j++)
{
targets[j] = GetClone(seq, source.Instructions, olds[j]);
}
instr.Operand = targets;
}
else if (instr.OpCode.OperandType == OperandType.ShortInlineBrTarget ||
instr.OpCode.OperandType == OperandType.InlineBrTarget)
{
instr.Operand = GetClone(seq, source.Instructions, (Instruction)oldi.Operand);
}
}
// Clone exception handlers
if (source.HasExceptionHandlers)
{
body.ComputeOffsets();
CloneInstructions(seq, source.Instructions, body.ExceptionHandlers, source.ExceptionHandlers);
}
// Replace ret instructions
var end = seq.Emit(OpCodes.Nop);
var retInstructions = seq.Where(x => x.OpCode.Code == Code.Ret).ToList();
foreach (var ins in retInstructions)
{
ins.OpCode = OpCodes.Br;
ins.Operand = end;
}
// Insert cloned instructions
prefixSeq.InsertTo(0, seq);
seq.InsertToAfter(instruction, body);
// Change replaced instruction to nop
instruction.ChangeToNop();
// Update offsets
body.ComputeOffsets();
}