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Peter Wang 90058a5e95 Fix problems with the verification of indirect structure reuse calls.

Branches: main

Fix problems with the verification of indirect structure reuse calls.
In many cases, a call to a procedure would be converted into reuse call even
though an input argument shares memory with another variable that is live
after the call.  As the test cases show, this even happened for trivial
programs.

compiler/ctgc.livedata.m:
compiler/structure_reuse.domain.m:
compiler/structure_sharing.domain.m:
	Reimplement `nodes_are_not_live' which is used to verify that
	datastructures which should be dead for a reuse call really are dead.
	I didn't understand how the original was supposed to work so I made up
	my own version which may or may not have any relation to the theory.

compiler/structure_reuse.indirect.m:
	When verifying an indirect reuse call site, don't project live data
	down to those about the callee arguments.  The call to
	`nodes_are_not_live' now depends on this.

tests/hard_coded/Mercury.options:
tests/hard_coded/Mmakefile:
tests/hard_coded/bad_indirect_reuse.exp:
tests/hard_coded/bad_indirect_reuse.m:
tests/hard_coded/bad_indirect_reuse2.exp:
tests/hard_coded/bad_indirect_reuse2.m:
tests/hard_coded/bad_indirect_reuse3.exp:
tests/hard_coded/bad_indirect_reuse3.m:
	Add test cases.  Switch off `--common-struct' as it tends to mask the
	problem.

2008-04-21 05:15:31 +00:00

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