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Bailouts can continue directly to tail

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* module/language/cps/compile-bytecode.scm (compile-function): Allow a
  'throw primcall in tail position.
* module/language/cps/prune-bailouts.scm (prune-bailouts): Continue
  directly to the nearest tail continuation, so we don't cause
  unreachable handle-interrupts / return 0 instructions to be emitted.
* module/language/cps/reify-primitives.scm (reify-clause): Residualized
  'throw primcall continues directly to tail.
* module/language/cps/verify.scm (check-arities): Relax check for
  'throw.
This commit is contained in:
Andy Wingo 2017-12-05 14:25:12 +01:00
parent 64acf24b40
commit 9db628ee29
4 changed files with 23 additions and 24 deletions
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3
module/language/cps/reify-primitives.scm
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@ -100,12 +100,11 @@
(define (reify-clause cps ktail)
(with-cps cps
(letk knil ($kargs () () ($continue ktail #f ($values ()))))
(let$ body
(with-cps-constants ((wna 'wrong-number-of-args)
(args '(#f "Wrong number of arguments" () #f)))
(build-term
($continue knil #f
($continue ktail #f
($primcall 'throw #f (wna args))))))
(letk kbody ($kargs () () ,body))
(letk kclause ($kclause ('() '() #f '() #f) kbody #f))