Ian, I need to build a node that is equivalent to the address of the memory being derenferenced. MEM_REF would help with the first parameter. But what about the third parameter? I would need an ADDR_EXPR for this parameter. However, the code I am using is failing. Thanks for the help. Zahed On Fri, Mar 9, 2012 at 6:04 PM, Ian Lance Taylor <iant@xxxxxxxxxx> wrote: > zahed khurasani <sdzahed@xxxxxxxxx> 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
