internal override void GenerateMethodBody(TypeCompilationState compilationState, BindingDiagnosticBag diagnostics)
{
AnonymousTypeManager manager = ((AnonymousTypeTemplateSymbol)this.ContainingType).Manager;
SyntheticBoundNodeFactory F = this.CreateBoundNodeFactory(compilationState, diagnostics);
// Method body:
//
// HASH_FACTOR = 0xa5555529;
// INIT_HASH = (...((0 * HASH_FACTOR) + GetFNVHashCode(backingFld_1.Name)) * HASH_FACTOR
// + GetFNVHashCode(backingFld_2.Name)) * HASH_FACTOR
// + ...
// + GetFNVHashCode(backingFld_N.Name)
//
// {
// return (...((INITIAL_HASH * HASH_FACTOR) + EqualityComparer<T_1>.Default.GetHashCode(this.backingFld_1)) * HASH_FACTOR
// + EqualityComparer<T_2>.Default.GetHashCode(this.backingFld_2)) * HASH_FACTOR
// ...
// + EqualityComparer<T_N>.Default.GetHashCode(this.backingFld_N)
// }
//
// Where GetFNVHashCode is the FNV-1a hash code.
// Type expression
AnonymousTypeTemplateSymbol anonymousType = (AnonymousTypeTemplateSymbol)this.ContainingType;
// INIT_HASH
int initHash = 0;
foreach (var property in anonymousType.Properties)
{
initHash = unchecked (initHash * MethodBodySynthesizer.HASH_FACTOR + Hash.GetFNVHashCode(property.BackingField.Name));
}
// Generate expression for return statement
// retExpression <= 'INITIAL_HASH'
BoundExpression retExpression = F.Literal(initHash);
// prepare symbols
MethodSymbol equalityComparer_GetHashCode = manager.System_Collections_Generic_EqualityComparer_T__GetHashCode;
MethodSymbol equalityComparer_get_Default = manager.System_Collections_Generic_EqualityComparer_T__get_Default;
// bound HASH_FACTOR
BoundLiteral boundHashFactor = null;
// Process fields
for (int index = 0; index < anonymousType.Properties.Length; index++)
{
retExpression = MethodBodySynthesizer.GenerateHashCombine(retExpression, equalityComparer_GetHashCode, equalityComparer_get_Default, ref boundHashFactor,
F.Field(F.This(), anonymousType.Properties[index].BackingField),
F);
}
// Create a bound block
F.CloseMethod(F.Block(F.Return(retExpression)));
}
internal override void GenerateMethodBody(TypeCompilationState compilationState, DiagnosticBag diagnostics)
{
var F = new SyntheticBoundNodeFactory(this, ContainingType.GetNonNullSyntaxNode(), compilationState, diagnostics);
try
{
MethodSymbol equalityComparer_GetHashCode = F.WellKnownMethod(WellKnownMember.System_Collections_Generic_EqualityComparer_T__GetHashCode, isOptional: false) !;
MethodSymbol equalityComparer_get_Default = F.WellKnownMethod(WellKnownMember.System_Collections_Generic_EqualityComparer_T__get_Default, isOptional: false) !;
BoundExpression currentHashValue;
if (ContainingType.BaseTypeNoUseSiteDiagnostics.IsObjectType())
{
// There are no base record types.
// Get hash code of the equality contract and combine it with hash codes for field values.
currentHashValue = MethodBodySynthesizer.GenerateGetHashCode(equalityComparer_GetHashCode, equalityComparer_get_Default, F.Property(F.This(), _equalityContract), F);
}
else
{
// There are base record types.
// Get base.GetHashCode() and combine it with hash codes for field values.
var overridden = OverriddenMethod;
currentHashValue = F.Call(F.Base(overridden.ContainingType), overridden);
}
// bound HASH_FACTOR
BoundLiteral?boundHashFactor = null;
foreach (var f in ContainingType.GetFieldsToEmit())
{
if (!f.IsStatic)
{
currentHashValue = MethodBodySynthesizer.GenerateHashCombine(currentHashValue, equalityComparer_GetHashCode, equalityComparer_get_Default, ref boundHashFactor,
F.Field(F.This(), f),
F);
}
}
F.CloseMethod(F.Block(F.Return(currentHashValue)));
}
catch (SyntheticBoundNodeFactory.MissingPredefinedMember ex)
{
diagnostics.Add(ex.Diagnostic);
F.CloseMethod(F.ThrowNull());
}
}
internal override void GenerateMethodBody(TypeCompilationState compilationState, BindingDiagnosticBag diagnostics)
{
var F = new SyntheticBoundNodeFactory(this, this.SyntaxNode, compilationState, diagnostics);
try
{
MethodSymbol? equalityComparer_GetHashCode = null;
MethodSymbol? equalityComparer_get_Default = null;
BoundExpression?currentHashValue;
if (ContainingType.IsRecordStruct)
{
currentHashValue = null;
}
else if (ContainingType.BaseTypeNoUseSiteDiagnostics.IsObjectType())
{
Debug.Assert(_equalityContract is not null);
if (_equalityContract.GetMethod is null)
{
// The equality contract isn't usable, an error was reported elsewhere
F.CloseMethod(F.ThrowNull());
return;
}
if (_equalityContract.IsStatic)
{
F.CloseMethod(F.ThrowNull());
return;
}
// There are no base record types.
// Get hash code of the equality contract and combine it with hash codes for field values.
ensureEqualityComparerHelpers(F, ref equalityComparer_GetHashCode, ref equalityComparer_get_Default);
currentHashValue = MethodBodySynthesizer.GenerateGetHashCode(equalityComparer_GetHashCode, equalityComparer_get_Default, F.Property(F.This(), _equalityContract), F);
}
else
{
// There are base record types.
// Get base.GetHashCode() and combine it with hash codes for field values.
var overridden = OverriddenMethod;
if (overridden is null || overridden.ReturnType.SpecialType != SpecialType.System_Int32)
{
// There was a problem with overriding, an error was reported elsewhere
F.CloseMethod(F.ThrowNull());
return;
}
currentHashValue = F.Call(F.Base(overridden.ContainingType), overridden);
}
// bound HASH_FACTOR
BoundLiteral?boundHashFactor = null;
foreach (var f in ContainingType.GetFieldsToEmit())
{
if (!f.IsStatic)
{
ensureEqualityComparerHelpers(F, ref equalityComparer_GetHashCode, ref equalityComparer_get_Default);
if (currentHashValue is null)
{
// EqualityComparer<field type>.Default.GetHashCode(this.field)
currentHashValue = MethodBodySynthesizer.GenerateGetHashCode(equalityComparer_GetHashCode, equalityComparer_get_Default, F.Field(F.This(), f), F);
}
else
{
currentHashValue = MethodBodySynthesizer.GenerateHashCombine(currentHashValue, equalityComparer_GetHashCode, equalityComparer_get_Default, ref boundHashFactor,
F.Field(F.This(), f),
F);
}
}
}
if (currentHashValue is null)
{
currentHashValue = F.Literal(0);
}
F.CloseMethod(F.Block(F.Return(currentHashValue)));
}
catch (SyntheticBoundNodeFactory.MissingPredefinedMember ex)
{
diagnostics.Add(ex.Diagnostic);
F.CloseMethod(F.ThrowNull());
}