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Copy pathTypeUtil.cs
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1040 lines (821 loc) · 33.9 KB
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using ICSharpCode.Decompiler;
using JSIL.Ast;
using JSIL.Internal;
using Mono.Cecil;
using Mono.CSharp;
using TypeDefinition = Mono.Cecil.TypeDefinition;
namespace JSIL {
public static class TypeUtil {
public static TypeReference GetElementType (TypeReference type, bool throwOnFail) {
type = StripModifiers(type);
var ts = type as TypeSpecification;
if (ts != null)
return ts.ElementType;
// HACK
if (type.FullName == "System.Void")
return type;
if (throwOnFail)
throw new ArgumentException("Has no ElementType", "type");
else
return null;
}
public static string GetLocalName (TypeDefinition type) {
var result = new List<string>();
result.Add(type.Name);
type = type.DeclaringType;
while (type != null) {
result.Insert(0, type.Name);
type = type.DeclaringType;
}
return String.Join("_", result);
}
public static bool IsArray (TypeReference type) {
type = StripModifiers(type);
var at = type as ArrayType;
if (at != null)
return true;
if (type == null)
return false;
if (type.FullName == "System.Array")
return true;
return false;
}
public static bool IsReferenceType (TypeReference type) {
type = StripModifiers(type);
if (IsStruct(type))
return false;
else if (IsIntegralOrEnum(type))
return false;
var gp = type as GenericParameter;
if (gp != null) {
foreach (var constraint in gp.Constraints)
if (IsReferenceType(constraint))
return true;
}
if (type is GenericInstanceType)
{
type = type.Resolve();
}
switch (type.MetadataType) {
case MetadataType.Object:
case MetadataType.Class:
case MetadataType.String:
case MetadataType.Array:
return true;
default:
return false;
}
}
public static bool IsStruct (TypeReference type) {
if (type == null)
return false;
type = DereferenceType(type);
MetadataType etype = type.MetadataType;
if (IsEnum(type))
return false;
var git = type as GenericInstanceType;
if (git != null)
return git.IsValueType;
var gp = type as GenericParameter;
if (gp != null) {
foreach (var constraint in gp.Constraints)
if (IsStruct(constraint))
return true;
}
// System.ValueType's MetadataType is Class... WTF.
if ((type.Namespace == "System") && (type.Name == "ValueType"))
return true;
return (etype == MetadataType.ValueType) ||
(etype == MetadataType.IntPtr) ||
(etype == MetadataType.UIntPtr);
}
public static bool IsNativeInteger (TypeReference type, out bool isSigned) {
type = StripModifiers(type);
var result = (type.Namespace == "JSIL.Types") &&
(
(type.Name == "NativeInt") ||
(type.Name == "NativeUInt")
);
isSigned = result && (type.Name == "NativeInt");
return result;
}
public static bool IsNativeInteger (TypeReference type) {
bool temp;
return IsNativeInteger(type, out temp);
}
public static bool IsNumeric (TypeReference type) {
type = DereferenceType(type);
switch (type.MetadataType) {
case MetadataType.Byte:
case MetadataType.SByte:
case MetadataType.Double:
case MetadataType.Single:
case MetadataType.Int16:
case MetadataType.Int32:
case MetadataType.Int64:
case MetadataType.UInt16:
case MetadataType.UInt32:
case MetadataType.UInt64:
return true;
// Blech
case MetadataType.UIntPtr:
case MetadataType.IntPtr:
return true;
default:
return IsNativeInteger(type);
}
}
public static bool? IsSigned (TypeReference type) {
type = DereferenceType(type);
switch (type.MetadataType) {
case MetadataType.IntPtr:
case MetadataType.SByte:
case MetadataType.Int16:
case MetadataType.Int32:
case MetadataType.Int64:
case MetadataType.Single:
case MetadataType.Double:
return true;
case MetadataType.Byte:
case MetadataType.UInt16:
case MetadataType.UInt32:
case MetadataType.UInt64:
case MetadataType.UIntPtr:
return false;
default: {
bool result;
if (IsNativeInteger(type, out result))
return result;
return null;
}
}
}
public static bool IsIntegral (TypeReference type) {
type = DereferenceType(type);
switch (type.MetadataType) {
case MetadataType.Byte:
case MetadataType.SByte:
case MetadataType.Int16:
case MetadataType.Int32:
case MetadataType.Int64:
case MetadataType.UInt16:
case MetadataType.UInt32:
case MetadataType.UInt64:
return true;
// Blech
case MetadataType.UIntPtr:
case MetadataType.IntPtr:
return true;
default:
return IsNativeInteger(type);
}
}
public static bool Is32BitIntegral (TypeReference type) {
type = DereferenceType(type);
switch (type.MetadataType) {
case MetadataType.Byte:
case MetadataType.SByte:
case MetadataType.UInt16:
case MetadataType.Int16:
case MetadataType.UInt32:
case MetadataType.Int32:
return true;
default:
return IsNativeInteger(type);
}
}
public static int SizeOfType (TypeReference type) {
type = DereferenceType(type);
switch (type.MetadataType) {
case MetadataType.Boolean:
return 1;
case MetadataType.Byte:
case MetadataType.SByte:
return 1;
case MetadataType.UInt16:
case MetadataType.Int16:
return 2;
case MetadataType.UInt32:
case MetadataType.Int32:
return 4;
case MetadataType.UInt64:
case MetadataType.Int64:
return 8;
case MetadataType.Single:
return 4;
case MetadataType.Double:
return 8;
case MetadataType.UIntPtr:
case MetadataType.IntPtr:
return 4;
}
if (IsNativeInteger(type))
return 4;
throw new ArgumentException("Type must be numeric");
}
public static bool IsIntPtr (TypeReference type) {
if (type == null)
return false;
type = StripModifiers(type);
return (type.FullName == "System.IntPtr") || (type.FullName == "System.UIntPtr");
}
public static bool IsPointer (TypeReference type) {
if (type == null)
return false;
type = StripModifiers(type);
return type.IsPointer;
}
public static bool Is32BitIntegralOrIntPtr (TypeReference type) {
return Is32BitIntegral(type) || IsIntPtr(type);
}
public static bool IsIntegralOrPointer (TypeReference type) {
return IsIntegral(type) || IsPointer(type);
}
public static bool IsFloatingPoint (TypeReference type) {
type = DereferenceType(type);
switch (type.MetadataType) {
case MetadataType.Single:
case MetadataType.Double:
return true;
default:
return false;
}
}
public static bool IsNullable (TypeReference type) {
int temp;
type = FullyDereferenceType(type, out temp);
var git = type as GenericInstanceType;
if ((git != null) && (git.Name == "Nullable`1"))
return true;
return false;
}
public static TypeReference StripNullable (TypeReference type) {
int temp;
type = FullyDereferenceType(type, out temp);
var git = type as GenericInstanceType;
if ((git != null) && (git.Name == "Nullable`1"))
return git.GenericArguments[0];
return type;
}
public static bool IsEnum (TypeReference type) {
var typedef = GetTypeDefinition(type);
return (typedef != null) && (typedef.IsEnum);
}
public static bool IsBoolean (TypeReference type) {
type = DereferenceType(type);
return type.MetadataType == MetadataType.Boolean;
}
public static bool IsIgnoredType (TypeReference type, bool enableUnsafeCode = true) {
type = DereferenceType(type);
if (type == null)
return false;
if (!enableUnsafeCode) {
if (type.IsPointer)
return true;
else if (type.IsPinned)
return true;
}
if (type.IsFunctionPointer)
return true;
else
return false;
}
public static bool IsDelegateType (TypeReference type) {
type = DereferenceType(type);
var typedef = GetTypeDefinition(type);
if (typedef == null)
return false;
if (typedef.FullName == "System.Delegate")
return true;
if (
(typedef.BaseType != null) &&
(
(typedef.BaseType.FullName == "System.Delegate") ||
(typedef.BaseType.FullName == "System.MulticastDelegate")
)
) {
return true;
}
return false;
}
public static bool IsOpenType (TypeReference type, Func<GenericParameter, bool> filter = null) {
type = DereferenceType(type);
var gp = type as GenericParameter;
var git = type as GenericInstanceType;
var at = type as ArrayType;
var byref = type as ByReferenceType;
if (gp != null) {
if (filter != null)
return filter(gp);
else
return true;
}
if (git != null) {
var elt = git.ElementType;
foreach (var ga in git.GenericArguments) {
if (IsOpenType(ga, filter))
return true;
}
return IsOpenType(elt, filter);
}
if (at != null)
return IsOpenType(at.ElementType, filter);
if (byref != null)
return IsOpenType(byref.ElementType, filter);
return false;
}
public static TypeReference StripModifiers (TypeReference reference) {
bool unwrapped = false;
do {
var rmt = reference as RequiredModifierType;
var omt = reference as OptionalModifierType;
if (rmt != null) {
reference = rmt.ElementType;
unwrapped = true;
} else if (omt != null) {
reference = omt.ElementType;
unwrapped = true;
} else {
unwrapped = false;
}
} while (unwrapped);
return reference;
}
public static TypeReference StripPointerOrReference (TypeReference reference) {
bool unwrapped = false;
do {
var pt = reference as PointerType;
var brt = reference as ByReferenceType;
if (pt != null) {
reference = pt.ElementType;
unwrapped = true;
} else if (brt != null) {
reference = brt.ElementType;
unwrapped = true;
} else {
unwrapped = false;
}
} while (unwrapped);
return reference;
}
public static TypeDefinition GetTypeDefinition (TypeReference typeRef, bool mapAllArraysToSystemArray = true) {
if (typeRef == null)
return null;
var ts = typeRef.Module.TypeSystem;
typeRef = DereferenceType(typeRef);
typeRef = StripModifiers(typeRef);
var at = typeRef as ArrayType;
if (at != null) {
if (mapAllArraysToSystemArray)
return new TypeReference(ts.Object.Namespace, "Array", ts.Object.Module, ts.Object.Scope).ResolveOrThrow();
var inner = GetTypeDefinition(at.ElementType, mapAllArraysToSystemArray);
if (inner != null)
return (new ArrayType(inner, at.Rank)).Resolve();
else
return null;
}
var gp = typeRef as GenericParameter;
if ((gp != null) && (gp.Owner == null))
return null;
else
return typeRef.Resolve();
}
public static TypeReference FullyDereferenceType (TypeReference type, out int depth) {
depth = 0;
var brt = type as ByReferenceType;
while (brt != null) {
depth += 1;
type = brt.ElementType;
brt = type as ByReferenceType;
}
return type;
}
public static TypeReference DereferenceType (TypeReference type, bool dereferencePointers = false) {
var brt = type as ByReferenceType;
if (brt != null)
return brt.ElementType;
if (dereferencePointers) {
var pt = type as PointerType;
if (pt != null)
return pt.ElementType;
}
return type;
}
private static bool TypeInBases (TypeReference haystack, TypeReference needle, bool explicitGenericEquality) {
if ((haystack == null) || (needle == null))
return haystack == needle;
var dToWalk = haystack.Resolve();
var dSource = needle.Resolve();
if ((dToWalk == null) || (dSource == null))
return TypesAreEqual(haystack, needle, explicitGenericEquality);
var t = haystack;
while (t != null) {
if (TypesAreEqual(t, needle, explicitGenericEquality))
return true;
var dT = t.Resolve();
if ((dT != null) && (dT.BaseType != null)) {
var baseType = dT.BaseType;
t = baseType;
} else
break;
}
return false;
}
private static bool ScopesMatch (TypeReference lhs, TypeReference rhs) {
if (
(lhs.DeclaringType != null) ||
(rhs.DeclaringType != null)
) {
return TypesAreEqual(lhs.DeclaringType, rhs.DeclaringType);
}
var sLhs = GetActualScope(lhs);
var sRhs = GetActualScope(rhs);
if (sLhs == sRhs)
return true;
else if (
(sLhs.StartsWith(sRhs) &&
(sLhs.EndsWith(".dll") || sLhs.EndsWith(".exe"))
) ||
(sRhs.StartsWith(sLhs) &&
(sRhs.EndsWith(".dll") || sRhs.EndsWith(".exe"))
)
)
return true;
return false;
}
private static string GetActualScope (TypeReference tr) {
var result = tr.Scope.Name;
if (tr.GetType() == typeof (TypeReference))
{
var definition = tr.Resolve();
if (definition != null)
{
result = definition.Scope.Name;
}
}
if (result == "CommonLanguageRuntimeLibrary")
result = "mscorlib";
return result;
}
public static bool TypesAreTriviallyEqual (TypeReference lhs, TypeReference rhs, out bool shallowMatch) {
var tTr = typeof(TypeReference);
var tTd = typeof(TypeDefinition);
shallowMatch = (lhs.Name == rhs.Name) &&
(lhs.Namespace == rhs.Namespace) &&
ScopesMatch(lhs, rhs);
if (
(
(lhs.GetType() == tTr) ||
(lhs.GetType() == tTd)
) && (
(rhs.GetType() == tTr) ||
(rhs.GetType() == tTd)
)
) {
if (shallowMatch)
return true;
}
return false;
}
private static bool? SubtypeElementComparison<T> (TypeReference lhs, TypeReference rhs, bool strictEquality)
where T : TypeSpecification
{
var tLhs = lhs as T;
var tRhs = rhs as T;
if ((tLhs != null) || (tRhs != null)) {
if ((tLhs == null) || (tRhs == null))
return false;
return TypesAreEqual(tLhs.ElementType, tRhs.ElementType, strictEquality);
}
return null;
}
public static bool TypesAreEqual (TypeReference target, TypeReference source, bool strictEquality = false) {
bool shallowMatch;
if (target == source)
return true;
else if ((target == null) || (source == null))
return (target == source);
else if (TypesAreTriviallyEqual(source, target, out shallowMatch))
return true;
int targetDepth, sourceDepth;
FullyDereferenceType(target, out targetDepth);
FullyDereferenceType(source, out sourceDepth);
var targetGp = target as GenericParameter;
var sourceGp = source as GenericParameter;
if ((targetGp != null) || (sourceGp != null)) {
if ((targetGp == null) || (sourceGp == null))
return false;
TypeReference temp;
// Generic parameters may be in positional (!0) form; expand them so they compare
// correctly with named (T) form.
if (IsPositionalGenericParameter(sourceGp)) {
ExpandPositionalGenericParameters(sourceGp, out temp);
sourceGp = (GenericParameter)temp;
}
if (IsPositionalGenericParameter(targetGp)) {
ExpandPositionalGenericParameters(targetGp, out temp);
targetGp = (GenericParameter)temp;
}
var targetOwnerType = targetGp.Owner as TypeReference;
var sourceOwnerType = sourceGp.Owner as TypeReference;
// https://github.com/jbevain/cecil/issues/97
if ((targetOwnerType != null) || (sourceOwnerType != null)) {
var basesEqual = false;
if (TypeInBases(targetOwnerType, sourceOwnerType, strictEquality))
basesEqual = true;
else if (TypeInBases(sourceOwnerType, targetOwnerType, strictEquality))
basesEqual = true;
if (!basesEqual)
return false;
} else {
// FIXME: Can't do an exact comparison here since we get called by MemberIdentifier comparisons.
}
if (targetGp.Type != sourceGp.Type)
return false;
if (targetGp.Name != sourceGp.Name)
return false;
if (targetGp.Position != sourceGp.Position)
return false;
return true;
}
var targetGit = target as GenericInstanceType;
var sourceGit = source as GenericInstanceType;
if ((targetGit != null) || (sourceGit != null)) {
if (!strictEquality) {
if ((targetGit != null) && TypesAreEqual(targetGit.ElementType, source))
return true;
if ((sourceGit != null) && TypesAreEqual(target, sourceGit.ElementType))
return true;
}
if ((targetGit == null) || (sourceGit == null))
return false;
if (targetGit.GenericArguments.Count != sourceGit.GenericArguments.Count)
return false;
for (var i = 0; i < targetGit.GenericArguments.Count; i++) {
if (!TypesAreEqual(targetGit.GenericArguments[i], sourceGit.GenericArguments[i], strictEquality))
return false;
}
return TypesAreEqual(targetGit.ElementType, sourceGit.ElementType, strictEquality);
}
var areEqualArray =
SubtypeElementComparison<ArrayType>(target, source, strictEquality);
if (areEqualArray.HasValue) {
return areEqualArray.Value && (
((ArrayType)target).Rank == ((ArrayType)source).Rank
);
}
var areEqualBR =
SubtypeElementComparison<ByReferenceType>(target, source, strictEquality);
if (areEqualBR.HasValue)
return areEqualBR.Value;
var areEqualP =
SubtypeElementComparison<PointerType>(target, source, strictEquality);
if (areEqualP.HasValue)
return areEqualP.Value;
var areEqualOM =
SubtypeElementComparison<OptionalModifierType>(target, source, strictEquality);
if (areEqualOM.HasValue)
return areEqualOM.Value;
var areEqualRM =
SubtypeElementComparison<RequiredModifierType>(target, source, strictEquality);
if (areEqualRM.HasValue)
return areEqualRM.Value;
var areEqualFP =
SubtypeElementComparison<FunctionPointerType>(target, source, strictEquality);
if (areEqualFP.HasValue)
return areEqualFP.Value;
areEqualP =
SubtypeElementComparison<PinnedType>(target, source, strictEquality);
if (areEqualP.HasValue)
return areEqualP.Value;
return shallowMatch;
}
public static IEnumerable<TypeDefinition> AllBaseTypesOf (TypeDefinition type) {
if (type == null)
yield break;
var baseType = GetTypeDefinition(type.BaseType);
while (baseType != null) {
yield return baseType;
baseType = GetTypeDefinition(baseType.BaseType);
}
}
public static bool TypesAreAssignable (ITypeInfoSource typeInfo, TypeReference target, TypeReference source) {
if ((target == null) || (source == null))
return false;
// All values are assignable to object
if (target.FullName == "System.Object")
return true;
int targetDepth, sourceDepth;
var targetDerefed = FullyDereferenceType(target, out targetDepth);
var sourceDerefed = FullyDereferenceType(source, out sourceDepth);
if (TypesAreEqual(targetDerefed, sourceDerefed)) {
if (targetDepth == sourceDepth)
return true;
}
// HACK: System.Array and T[] do not implement IEnumerable<T>
if (
source.IsArray &&
(target.Namespace == "System.Collections.Generic")
) {
var targetGit = target as GenericInstanceType;
if (
(targetGit != null) &&
(targetGit.Name == "IEnumerable`1") &&
(targetGit.GenericArguments.FirstOrDefault() == ((ArrayType)source).ElementType)
)
return true;
}
if (IsPointer(source)) {
// HACK: The .NET type system treats pointers and native ints as assignable to each other
if (IsNativeInteger(target))
return true;
// HACK: T& = T* (but not T* = T& ...?)
if (
target.IsByReference &&
TypesAreEqual(targetDerefed, source.GetElementType(), true)
) {
return true;
}
// HACK
if (IsIntegral(target))
return false;
}
var cacheKey = new Tuple<string, string>(target.FullName, source.FullName);
return typeInfo.AssignabilityCache.GetOrCreate(
cacheKey, (key) => {
bool result = false;
var dSource = GetTypeDefinition(source);
if (TypeInBases(source, target, false))
result = true;
else if (dSource == null)
result = false;
else if (TypesAreEqual(target, dSource))
result = true;
else if ((dSource.BaseType != null) && TypesAreAssignable(typeInfo, target, dSource.BaseType))
result = true;
else {
foreach (var iface in dSource.Interfaces) {
if (TypesAreAssignable(typeInfo, target, iface)) {
result = true;
break;
}
}
}
return result;
}
);
}
public static bool IsIntegralOrEnum (TypeReference type) {
var typedef = GetTypeDefinition(type);
return IsIntegral(type) || ((typedef != null) && typedef.IsEnum);
}
public static bool IsNumericOrEnum (TypeReference type) {
var typedef = GetTypeDefinition(type);
return IsNumeric(type) || ((typedef != null) && typedef.IsEnum);
}
public static JSExpression[] GetArrayDimensions (TypeReference arrayType) {
var at = arrayType as ArrayType;
if (at == null)
return null;
var result = new List<JSExpression>();
for (var i = 0; i < at.Dimensions.Count; i++) {
var dim = at.Dimensions[i];
if (dim.IsSized)
result.Add(JSLiteral.New(dim.UpperBound.Value));
else
return null;
}
return result.ToArray();
}
public static bool ContainsGenericParameter (TypeReference type) {
type = DereferenceType(type);
var gp = type as GenericParameter;
var git = type as GenericInstanceType;
var at = type as ArrayType;
var byref = type as ByReferenceType;
if (gp != null)
return true;
if (git != null) {
var elt = git.ElementType;
foreach (var ga in git.GenericArguments) {
if (ContainsGenericParameter(ga))
return true;
}
return ContainsGenericParameter(elt);
}
if (at != null)
return ContainsGenericParameter(at.ElementType);
if (byref != null)
return ContainsGenericParameter(byref.ElementType);
return false;
}
public static bool ContainsPositionalGenericParameter (TypeReference type) {
type = DereferenceType(type);
var gp = type as GenericParameter;
var git = type as GenericInstanceType;
var at = type as ArrayType;
var byref = type as ByReferenceType;
if (gp != null)
return IsPositionalGenericParameter(gp);
if (git != null) {
var elt = git.ElementType;
foreach (var ga in git.GenericArguments) {
if (IsPositionalGenericParameter(ga))
return true;
}
return IsPositionalGenericParameter(elt);
}
if (at != null)
return IsPositionalGenericParameter(at.ElementType);
if (byref != null)
return IsPositionalGenericParameter(byref.ElementType);
return false;
}
public static bool IsPositionalGenericParameter (TypeReference type) {
var gp = type as GenericParameter;
if (gp != null)
return IsPositionalGenericParameter(gp);
else
return false;
}
public static bool IsPositionalGenericParameter (GenericParameter gp) {
return gp.Name[0] == '!';
}
public static bool ExpandPositionalGenericParameters (TypeReference type, out TypeReference expanded) {
var gp = type as GenericParameter;
var git = type as GenericInstanceType;
var at = type as ArrayType;
var byref = type as ByReferenceType;
TypeReference _expanded;
if (gp != null) {
if (IsPositionalGenericParameter(gp)) {
var ownerType = gp.Owner as TypeReference;
var ownerMethod = gp.Owner as MethodReference;
if (ownerType != null) {
var resolvedOwnerType = ownerType.Resolve();
if (resolvedOwnerType == null) {
expanded = type;
return false;
}
expanded = resolvedOwnerType.GenericParameters[int.Parse(gp.Name.Replace("!", ""))];
return true;
} else if (ownerMethod != null) {
var resolvedOwnerMethod = ownerMethod.Resolve();
if (resolvedOwnerMethod == null) {
expanded = type;
return false;
}
expanded = resolvedOwnerMethod.GenericParameters[int.Parse(gp.Name.Replace("!", ""))];
return true;
} else {
throw new NotImplementedException("Unknown positional generic parameter type");
}
}
}
if (git != null) {
var elt = git.ElementType;
if (ContainsPositionalGenericParameter(elt) || git.GenericArguments.Any(ContainsPositionalGenericParameter)) {
ExpandPositionalGenericParameters(elt, out _expanded);
var result = new GenericInstanceType(_expanded);
foreach (var ga in git.GenericArguments) {
ExpandPositionalGenericParameters(ga, out _expanded);
result.GenericArguments.Add(_expanded);
}
expanded = result;
return true;
}