74f48414f1
Lean does not exit on panic anymore. The old behavior (`std::exit(1)`) produces a horrible debugging experience for the elaborator since all trace messages are lost. The new command line option restores the old behavior. cc @Kha @dselsam
39 lines
1.4 KiB
Text
39 lines
1.4 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.Data.String.Basic
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import Init.Data.ToString
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universes u v
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/- debugging helper functions -/
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@[neverExtract, extern "lean_dbg_trace"]
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def dbgTrace {α : Type u} (s : String) (f : Unit → α) : α :=
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f ()
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/- Display the given message if `a` is shared, that is, RC(a) > 1 -/
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@[neverExtract, extern "lean_dbg_trace_if_shared"]
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def dbgTraceIfShared {α : Type u} (s : String) (a : α) : α :=
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a
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@[extern "lean_dbg_sleep"]
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def dbgSleep {α : Type u} (ms : UInt32) (f : Unit → α) : α :=
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f ()
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@[extern c inline "#4"]
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unsafe def unsafeCast {α : Type u} {β : Type v} [Inhabited β] (a : α) : β := arbitrary _
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@[neverExtract, extern "lean_panic_fn"]
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constant panic {α : Type u} [Inhabited α] (msg : String) : α := arbitrary _
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@[noinline] private def mkPanicMessage (modName : String) (line col : Nat) (msg : String) : String :=
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"PANIC at " ++ modName ++ ":" ++ toString line ++ ":" ++ toString col ++ ": " ++ msg
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@[neverExtract, inline] def panicWithPos {α : Type u} [Inhabited α] (modName : String) (line col : Nat) (msg : String) : α :=
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panic (mkPanicMessage modName line col msg)
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-- TODO: should be a macro
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@[neverExtract, noinline, nospecialize] def unreachable! {α : Type u} [Inhabited α] : α :=
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panic! "unreachable"
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