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//
// Author:
// Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2015 Jb Evain
// Copyright (c) 2008 - 2011 Novell, Inc.
//
// Licensed under the MIT/X11 license.
//
using System;
using System.Threading;
using Mono.Collections.Generic;
namespace Mono.Cecil.Cil {
public sealed class MethodBody : IVariableDefinitionProvider {
readonly internal MethodDefinition method;
internal ParameterDefinition this_parameter;
internal int max_stack_size;
internal int code_size;
internal bool init_locals;
internal MetadataToken local_var_token;
internal Collection<Instruction> instructions;
internal Collection<ExceptionHandler> exceptions;
internal Collection<VariableDefinition> variables;
Scope scope;
public MethodDefinition Method {
get { return method; }
}
public int MaxStackSize {
get { return max_stack_size; }
set { max_stack_size = value; }
}
public int CodeSize {
get { return code_size; }
}
public bool InitLocals {
get { return init_locals; }
set { init_locals = value; }
}
public MetadataToken LocalVarToken {
get { return local_var_token; }
set { local_var_token = value; }
}
public Collection<Instruction> Instructions {
get { return instructions ?? (instructions = new InstructionCollection ()); }
}
public bool HasExceptionHandlers {
get { return !exceptions.IsNullOrEmpty (); }
}
public Collection<ExceptionHandler> ExceptionHandlers {
get { return exceptions ?? (exceptions = new Collection<ExceptionHandler> ()); }
}
public bool HasVariables {
get { return !variables.IsNullOrEmpty (); }
}
public Collection<VariableDefinition> Variables {
get { return variables ?? (variables = new VariableDefinitionCollection ()); }
}
public Scope Scope {
get { return scope; }
set { scope = value; }
}
public ParameterDefinition ThisParameter {
get {
if (method == null || method.DeclaringType == null)
throw new NotSupportedException ();
if (!method.HasThis)
return null;
if (this_parameter == null)
Interlocked.CompareExchange (ref this_parameter, CreateThisParameter (method), null);
return this_parameter;
}
}
static ParameterDefinition CreateThisParameter (MethodDefinition method)
{
var declaring_type = method.DeclaringType;
var type = declaring_type.IsValueType || declaring_type.IsPrimitive
? new PointerType (declaring_type)
: declaring_type as TypeReference;
return new ParameterDefinition (type, method);
}
public MethodBody (MethodDefinition method)
{
this.method = method;
}
public ILProcessor GetILProcessor ()
{
return new ILProcessor (this);
}
}
public interface IVariableDefinitionProvider {
bool HasVariables { get; }
Collection<VariableDefinition> Variables { get; }
}
class VariableDefinitionCollection : Collection<VariableDefinition> {
internal VariableDefinitionCollection ()
{
}
internal VariableDefinitionCollection (int capacity)
: base (capacity)
{
}
protected override void OnAdd (VariableDefinition item, int index)
{
item.index = index;
}
protected override void OnInsert (VariableDefinition item, int index)
{
item.index = index;
for (int i = index; i < size; i++)
items [i].index = i + 1;
}
protected override void OnSet (VariableDefinition item, int index)
{
item.index = index;
}
protected override void OnRemove (VariableDefinition item, int index)
{
item.index = -1;
for (int i = index + 1; i < size; i++)
items [i].index = i - 1;
}
}
class InstructionCollection : Collection<Instruction> {
internal InstructionCollection ()
{
}
internal InstructionCollection (int capacity)
: base (capacity)
{
}
protected override void OnAdd (Instruction item, int index)
{
if (index == 0)
return;
var previous = items [index - 1];
previous.next = item;
item.previous = previous;
}
protected override void OnInsert (Instruction item, int index)
{
if (size == 0)
return;
var current = items [index];
if (current == null) {
var last = items [index - 1];
last.next = item;
item.previous = last;
return;
}
var previous = current.previous;
if (previous != null) {
previous.next = item;
item.previous = previous;
}
current.previous = item;
item.next = current;
}
protected override void OnSet (Instruction item, int index)
{
var current = items [index];
item.previous = current.previous;
item.next = current.next;
current.previous = null;
current.next = null;
}
protected override void OnRemove (Instruction item, int index)
{
var previous = item.previous;
if (previous != null)
previous.next = item.next;
var next = item.next;
if (next != null)
next.previous = item.previous;
item.previous = null;
item.next = null;
}
}
}
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