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Handle invalid packed dimensions 

Trying to elaborate a type with invalid packed dimensions currently results
in a crash. E.g. `typedef logic [] T;`

The issue is in the `elaborate_array_ranges()` function which
does not verify that the range specification is valid.

Replace the `elaborate_array_ranges()` with `evaluate_ranges()`, which does
the same thing, but properly checks the range specification and
reports an error if it is invalid.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
This commit is contained in:
Lars-Peter Clausen 2022-01-06 11:34:20 +01:00
parent f705e7b61c
commit 52925ce9ff
1 changed files with 4 additions and 40 deletions
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44
elab_type.cc
View File

@ -34,44 +34,6 @@
using namespace std;
/*
* Some types have a list of ranges that need to be elaborated. This
* function elaborates the ranges referenced by "dims" into the vector
* "ranges".
*/
static void elaborate_array_ranges(Design*des, NetScope*scope,
vector<netrange_t>&ranges,
const list<pform_range_t>*dims)
{
if (dims == 0)
return;
for (list<pform_range_t>::const_iterator cur = dims->begin()
; cur != dims->end() ; ++ cur) {
NetExpr*me = elab_and_eval(des, scope, cur->first, 0, true);
NetExpr*le = elab_and_eval(des, scope, cur->second, 0, true);
/* If elaboration failed for either expression, we
should have already reported the error, so just
skip the following evaluation to recover. */
long mnum = 0, lnum = 0;
if ( me && ! eval_as_long(mnum, me) ) {
assert(0);
des->errors += 1;
}
if ( le && ! eval_as_long(lnum, le) ) {
assert(0);
des->errors += 1;
}
ranges.push_back(netrange_t(mnum, lnum));
}
}
/*
* Elaborations of types may vary depending on the scope that it is
* done in, so keep a per-scope cache of the results.
@ -164,7 +126,8 @@ ivl_type_s* enum_type_t::elaborate_type_raw(Design*, NetScope*scope) const
ivl_type_s* vector_type_t::elaborate_type_raw(Design*des, NetScope*scope) const
{
vector<netrange_t> packed;
elaborate_array_ranges(des, scope, packed, pdims.get());
if (pdims.get())
evaluate_ranges(des, scope, this, packed, *pdims);
netvector_t*tmp = new netvector_t(packed, base_type);
tmp->set_signed(signed_flag);
@ -192,7 +155,8 @@ ivl_type_s* string_type_t::elaborate_type_raw(Design*, NetScope*) const
ivl_type_s* parray_type_t::elaborate_type_raw(Design*des, NetScope*scope) const
{
vector<netrange_t>packed;
elaborate_array_ranges(des, scope, packed, dims.get());
if (dims.get())
evaluate_ranges(des, scope, this, packed, *dims);
ivl_type_t etype = base_type->elaborate_type(des, scope);