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Microsoft.CodeAnalysis.PerformanceSensitiveAnalyzers.md

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Microsoft.CodeAnalysis.PerformanceSensitiveAnalyzers

HAA0101: Array allocation for params parameter

This call site is calling into a function with a 'params' parameter. This results in an array allocation.

Item Value
Category Performance
Enabled True
Severity Warning
CodeFix False

HAA0102: Non-overridden virtual method call on value type

Non-overridden virtual method call on a value type adds a boxing or constrained instruction

Item Value
Category Performance
Enabled True
Severity Warning
CodeFix False

HAA0201: Implicit string concatenation allocation

Considering using StringBuilder

Item Value
Category Performance
Enabled True
Severity Warning
CodeFix False

HAA0202: Value type to reference type conversion allocation for string concatenation

Value type ({0}) is being boxed to a reference type for a string concatenation

Item Value
Category Performance
Enabled True
Severity Warning
CodeFix False

HAA0301: Closure Allocation Source

Heap allocation of closure Captures: {0}

Item Value
Category Performance
Enabled True
Severity Warning
CodeFix False

HAA0302: Display class allocation to capture closure

The compiler will emit a class that will hold this as a field to allow capturing of this closure

Item Value
Category Performance
Enabled True
Severity Warning
CodeFix False

HAA0303: Lambda or anonymous method in a generic method allocates a delegate instance

Considering moving this out of the generic method

Item Value
Category Performance
Enabled True
Severity Warning
CodeFix False

HAA0401: Possible allocation of reference type enumerator

Non-ValueType enumerator may result in a heap allocation

Item Value
Category Performance
Enabled True
Severity Warning
CodeFix False

HAA0501: Explicit new array type allocation

Explicit new array type allocation

Item Value
Category Performance
Enabled True
Severity Info
CodeFix True

HAA0502: Explicit new reference type allocation

Explicit new reference type allocation

Item Value
Category Performance
Enabled True
Severity Info
CodeFix True

HAA0503: Explicit new anonymous object allocation

Explicit new anonymous object allocation

Item Value
Category Performance
Enabled True
Severity Info
CodeFix False

HAA0506: Let clause induced allocation

Let clause induced allocation

Item Value
Category Performance
Enabled True
Severity Info
CodeFix False

HAA0601: Value type to reference type conversion causing boxing allocation

Value type to reference type conversion causes boxing at call site (here), and unboxing at the callee-site. Consider using generics if applicable.

Item Value
Category Performance
Enabled True
Severity Warning
CodeFix False

HAA0602: Delegate on struct instance caused a boxing allocation

Struct instance method being used for delegate creation, this will result in a boxing instruction

Item Value
Category Performance
Enabled True
Severity Warning
CodeFix False

HAA0603: Delegate allocation from a method group

This will allocate a delegate instance

Item Value
Category Performance
Enabled True
Severity Warning
CodeFix False

HAA0604: Delegate allocation from a method group

This will allocate a delegate instance

Item Value
Category Performance
Enabled True
Severity Info
CodeFix False