Re: Help with building ADDR_EXPR node

[Ian Lance Taylor <iant at google dot com>]

zahed khurasani <sdzahed@gmail.com> writes:

> My check function accepts three parameters: the value being
> dereferenced, the size of the object and the address in memory. I am
> using the following two lines to get the third address parameter.
>
> addr = build1 (ADDR_EXPR, build_pointer_type (type), t); // t is the
> ARRAY_REF node
> fold_convert_loc(location, ptr_type_node, addr); // type case to void *
>
> However, this is failing whenever the array_ref contains a
> non-constant expression, say like a[i+1]. The specific failure is
> inside the expand_expr_real_1 method in the file expr.c. Looks like
> such non-constant indices are not allowed at this stage in the
> compilation (I've inserted the pass just before lowering to RTL
> happens).
>
> My question is, what would be the right way to get the address? I am
> looking for something that will preferably work for all dereferences
> like MEM_REF, INDIRECT_REF etc.

ARRAY_REF certainly permits non-constant indices, so I don't think that
is your problem.

However, MEM_REF is the most general memory reference expression.

Ian