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1cf8d08a97
The size of the element of the FAM _cannot_ reliably depends on the original
TYPE of the FAM that we passed as the 6th parameter to the .ACCESS_WITH_SIZE:
TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (gimple_call_arg (call, 5))))
when the element of the FAM has a variable length type. Since the variable
that represents TYPE_SIZE_UNIT has no explicit usage in the original IL,
compiler transformations (such as DSE) that are applied before object_size
phase might eliminate the whole definition to the variable that represents
the TYPE_SIZE_UNIT of the element of the FAM.
In order to resolve this issue, instead of passing the original TYPE of the
FAM as the 6th argument to .ACCESS_WITH_SIZE, we should explicitly pass the
original TYPE_SIZE_UNIT of the element TYPE of the FAM as the 6th argument
to the call to .ACCESS_WITH_SIZE.
PR middle-end/121000
gcc/c/ChangeLog:
* c-typeck.cc (build_access_with_size_for_counted_by): Update comments.
Pass TYPE_SIZE_UNIT of the element as the 6th argument.
gcc/ChangeLog:
* internal-fn.cc (expand_ACCESS_WITH_SIZE): Update comments.
* internal-fn.def (ACCESS_WITH_SIZE): Update comments.
* tree-object-size.cc (access_with_size_object_size): Update comments.
Get the element_size from the 6th argument directly.
gcc/testsuite/ChangeLog:
* gcc.dg/flex-array-counted-by-pr121000.c: New test.
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