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Fix a bug that broke tests/hard_coded/ho_soln (amongst others)

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Fix a bug that broke tests/hard_coded/ho_soln (amongst others)
in grade hlc.agc.

compiler/handle_options.m:
	If accurate GC is enabled, disable heap reclamation on failure.
	This is needed because accurate GC currently doesn't support
	heap reclamation on failure.
This commit is contained in:
Fergus Henderson
2003-02-21 05:13:25 +00:00
parent f6d1e29598
commit 562dbe059a
1 changed files with 19 additions and 0 deletions
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19
compiler/handle_options.m
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@@ -812,6 +812,21 @@ postprocess_options_2(OptionTable0, Target, GC_Method, TagsMethod,
% For the MLDS back-end, `--gc accurate' requires just typeinfo
% liveness.
%
% XXX Currently we also need to disable heap reclamation on failure
% if accurate GC is enabled.
% There are two issues with heap reclamation on failure:
% (i) For heap reclamation on failure to work at all,
% we also need at least some degree of liveness-accuracy.
% Otherwise a local variable may get initialized to point
% to the heap, then the heap is reset, then the memory
% is overwritten with new allocations, and then a collection
% occurs, at which point the local variable now points to
% a value of the wrong type.
% (ii) The current method of handling saved heap pointers during GC
% means that we lose heap reclamation on failure after a
% GC occurs. A better method would be to just allocate a
% word of heap space at each choice point.
%
% XXX currently accurate GC also requires disabling the higher-order
% specialization pass, since that pass creates procedures
% which don't respect left-to-right scoping of type_info parameters,
@@ -824,6 +839,10 @@ postprocess_options_2(OptionTable0, Target, GC_Method, TagsMethod,
globals__io_set_option(body_typeinfo_liveness, bool(yes)),
globals__io_set_option(allow_hijacks, bool(no)),
globals__io_set_option(optimize_frames, bool(no)),
globals__io_set_option(
reclaim_heap_on_semidet_failure, bool(no)),
globals__io_set_option(
reclaim_heap_on_nondet_failure, bool(no)),
globals__io_set_option(optimize_higher_order, bool(no))
;
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