34 lines
1.2 KiB
Text
34 lines
1.2 KiB
Text
/-
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Copyright (c) 2019 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Leonardo de Moura
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-/
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prelude
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import init.lean.attributes
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namespace Lean
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namespace Compiler
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def mkImplementedByAttr : IO (ParametricAttribute Name) :=
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registerParametricAttribute `implementedBy "name of the Lean (probably unsafe) function that implements opaque constant" $ fun env declName stx =>
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match env.find declName with
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| none => Except.error "unknown declaration"
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| some decl =>
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match attrParamSyntaxToIdentifier stx with
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| some fnName =>
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match env.find fnName with
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| none => Except.error ("unknown function '" ++ toString fnName ++ "'")
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| some fnDecl =>
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if decl.type == fnDecl.type then Except.ok fnName
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else Except.error ("invalid function '" ++ toString fnName ++ "' type mismatch")
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| _ => Except.error "expected identifier"
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@[init mkImplementedByAttr]
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constant implementedByAttr : ParametricAttribute Name := default _
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@[export lean_get_implemented_by]
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def getImplementedBy (env : Environment) (n : Name) : Option Name :=
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implementedByAttr.getParam env n
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end Compiler
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end Lean
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