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4f79ef0b59
Estimated hours taken: 12
Branches: main
Implement a change to the mode system suggested by Ralph Becket to make use of
higher order functions a bit easier.
During mode checking of higher order calls, if the variable being called has a
higher-order function type, but only a ground inst with no higher-order
information, assume that it has the default function modes.
Also, when doing anything that might cause a variable's inst to lose higher
order mode information, report a mode error if the variable has a non-standard
higher order function mode. Situations where this may occur are at call sites,
exit sites and when merging insts at the end of a branched goal.
Note that because of this restriction, this change is not backwards compatible.
compiler/inst_util.m:
Define some predicates to check for and produce pred_inst_infos for
default function modes.
In 'inst_merge', ensure that higher order inst information is not lost
from non-standard function insts.
compiler/inst_match.m:
In 'inst_matches_initial' and 'inst_matches_final', ensure that higher
order inst information is not lost from non-standard function insts.
Also allow 'inst_matches_{initial,final,binding}' to succeed
where the first inst is a standard function inst and the
second is ground.
compiler/modecheck_call.m:
In 'modecheck_higher_order_call', if the variable to be called has no
pred_inst_info, but the correct higher-order function type, assume it
has the default function modes.
mode_util.m:
pd_util.m:
Before replacing a ground inst with 'ground(Uniq, none)', ensure that it
does not contain any nonstandard function insts.
tests/hard_coded/Mmakefile:
tests/hard_coded/ho_func_default_inst.m:
tests/hard_coded/ho_func_default_inst.exp:
tests/invalid/Mmakefile:
tests/invalid/ho_default_func_1.m:
tests/invalid/ho_default_func_1.err_exp:
tests/invalid/ho_default_func_2.m:
tests/invalid/ho_default_func_2.err_exp:
tests/invalid/ho_default_func_3.m:
tests/invalid/ho_default_func_3.err_exp:
Add some test cases.
tests/invalid/Mmakefile:
tests/invalid/ho_default_func_4.m:
tests/invalid/ho_default_func_4.err_exp:
tests/invalid/inst_matches_final_bug.m:
tests/invalid/inst_matches_final_bug.err_exp:
Add some test cases which we do not yet pass due to a bug in
inst_matches_final.
NEWS:
doc/reference_manual.tex:
Document the change.
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