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allow case-lambda expressions with no clauses

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* module/ice-9/psyntax-pp.scm:
* module/ice-9/psyntax.scm (case-lambda, case-lambda*): Allow 0
  clauses.

* module/language/scheme/decompile-tree-il.scm (do-decompile):
  (choose-output-names):
* module/language/tree-il.scm (unparse-tree-il):
  (tree-il-fold, post-order!, pre-order!):
* module/language/tree-il/effects.scm (make-effects-analyzer):
* module/language/tree-il/cse.scm (cse):
* module/language/tree-il/debug.scm (verify-tree-il):
* module/language/tree-il/peval.scm (peval): Allow for lambda-body to be
  #f.

* libguile/memoize.c (memoize):
* module/language/tree-il/canonicalize.scm (canonicalize!): Give a body
  to empty case-lambda before evaluating it or compiling it,
  respectively.

* test-suite/tests/optargs.test ("case-lambda", "case-lambda*"): Add
  tests.
This commit is contained in:
Andy Wingo 2013-03-02 19:04:47 +01:00
parent 9ddf06dcee
commit 19113f1ca7
11 changed files with 120 additions and 58 deletions
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25
libguile/memoize.c
View file

@ -269,14 +269,33 @@ memoize (SCM exp, SCM env)
return MAKMEMO_BEGIN (memoize_exps (REF (exp, SEQUENCE, EXPS), env));
case SCM_EXPANDED_LAMBDA:
/* The body will be a lambda-case. */
/* The body will be a lambda-case or #f. */
{
SCM meta, docstring, proc;
SCM meta, docstring, body, proc;
meta = REF (exp, LAMBDA, META);
docstring = scm_assoc_ref (meta, scm_sym_documentation);
proc = memoize (REF (exp, LAMBDA, BODY), env);
body = REF (exp, LAMBDA, BODY);
if (scm_is_false (body))
/* Give a body to case-lambda with no clauses. */
proc = MAKMEMO_LAMBDA
(MAKMEMO_CALL
(MAKMEMO_MOD_REF (list_of_guile,
scm_from_latin1_symbol ("throw"),
SCM_BOOL_F),
5,
scm_list_5 (MAKMEMO_QUOTE (scm_args_number_key),
MAKMEMO_QUOTE (SCM_BOOL_F),
MAKMEMO_QUOTE (scm_from_latin1_string
("Wrong number of arguments")),
MAKMEMO_QUOTE (SCM_EOL),
MAKMEMO_QUOTE (SCM_BOOL_F))),
FIXED_ARITY (0),
SCM_BOOL_F /* docstring */);
else
proc = memoize (body, env);
if (scm_is_string (docstring))
{
SCM args = SCM_MEMOIZED_ARGS (proc);