Attribute Annotation

Concept

In the Sail instruction-set semantics specification language, an attribute annotation is a form of metadata that can be attached to definitions to carry auxiliary information used by tools, backends, or type-system extensions. Attribute annotations are part of Sail's BNF grammar and are reused in several syntactic positions, including definitions, function clauses, and as general declaration modifiers.

First seen 8/6/2026

Last seen 8/6/2026

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Attribute Annotation

Overview

In the Sail instruction-set semantics specification language, an attribute annotation is a form of metadata that can be attached to a definition, function clause, or other declaration to carry auxiliary information processed by Sail tooling, backends, or downstream type-system extensions.

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RELATIONSHIPS

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Sail ISA Specification Language ← implements 2e

Sail implements attribute annotations that can be attached to definitions and expressions.

BNF Grammar part of → 1e

The BNF grammar includes attribute annotation productions.

Function Definition ← uses 1e

Function definitions use attribute annotations to control visibility and behavior.

LINKED ENTITIES

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Sail ISA Specification Language IMPLEMENTS Extracted graph relationship

BNF Grammar PART_OF Extracted graph relationship

Function Definition USES Extracted graph relationship

CITATIONS

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4 citations — click to collapse

[1] An attribute annotation in Sail has the form $[ATTRIBUTE] or $[ATTRIBUTE <attribute_data> ] and carries an optional structured payload. The Sail instruction-set semantics specification language

[2] Attribute data values may be numbers, string literals, identifiers, booleans, key/value objects, or arrays. The Sail instruction-set semantics specification language

[3] Definitions in Sail admit an attribute annotation as a prefix via the <def> production. The Sail instruction-set semantics specification language

[4] Function clauses can be prefixed by an attribute annotation through the <funcl_annotation> production, alongside the Private modifier. The Sail instruction-set semantics specification language