Class LocalFunctionDecompiler

Namespace

ICSharpCode.Decompiler.IL.Transforms

Assembly

ICSharpCode.Decompiler.dll

Decompiler step for C# 7.0 local functions

public class LocalFunctionDecompiler : IILTransform

Inheritance

object

LocalFunctionDecompiler

Implements

IILTransform

Inherited Members

object.GetType()

object.MemberwiseClone()

object.ToString()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

Constructors

LocalFunctionDecompiler()

public LocalFunctionDecompiler()

Methods

IsLocalFunctionDisplayClass(PEFile, TypeDefinitionHandle, ILTransformContext)

public static bool IsLocalFunctionDisplayClass(PEFile module, TypeDefinitionHandle typeHandle, ILTransformContext context = null)

Parameters

module PEFile

typeHandle TypeDefinitionHandle

context ILTransformContext

Returns

bool

IsLocalFunctionMethod(PEFile, MethodDefinitionHandle, ILTransformContext)

public static bool IsLocalFunctionMethod(PEFile module, MethodDefinitionHandle methodHandle, ILTransformContext context = null)

Parameters

module PEFile

methodHandle MethodDefinitionHandle

context ILTransformContext

Returns

bool

IsLocalFunctionMethod(IMethod, ILTransformContext)

public static bool IsLocalFunctionMethod(IMethod method, ILTransformContext context)

Parameters

method IMethod

context ILTransformContext

Returns

bool

LocalFunctionNeedsAccessibilityChange(PEFile, MethodDefinitionHandle)

public static bool LocalFunctionNeedsAccessibilityChange(PEFile module, MethodDefinitionHandle methodHandle)

Parameters

module PEFile

methodHandle MethodDefinitionHandle

Returns

bool

Run(ILFunction, ILTransformContext)

The transform works like this:

local functions can either be used in method calls, i.e., call and callvirt instructions, or can be used as part of the "delegate construction" pattern, i.e., newobj Delegate(<target-expression>, ldftn <method>).

As local functions can be declared practically anywhere, we have to take a look at all use-sites and infer the declaration location from that. Use-sites can be call, callvirt and ldftn instructions. After all use-sites are collected we construct the ILAst of the local function and add it to the parent function. Then all use-sites of the local-function are transformed to a call to the LocalFunctionMethod or a ldftn of the LocalFunctionMethod. In a next step we handle all nested local functions. After all local functions are transformed, we move all local functions that capture any variables to their respective declaration scope.

public void Run(ILFunction function, ILTransformContext context)

Parameters

function ILFunction

context ILTransformContext