PR c++/77804 - Internal compiler error on incorrect initialization of new-d array
gcc/cp/ChangeLog:
2016-10-03 Martin Sebor <msebor@redhat.com>
PR c++/77804
* init.c (warn_placement_new_too_small): Avoid assuming an array type
has a constant size.
gcc/testsuite/ChangeLog:
2016-10-03 Martin Sebor <msebor@redhat.com>
PR c++/77804
* g++.dg/warn/Wplacement-new-size-4.C: New test.
@@ -2504,7 +2504,7 @@ warn_placement_new_too_small (tree type, tree nelts, tree size, tree oper)
&& warn_placement_new < 2)
return;
}
-
+
/* The size of the buffer can only be adjusted down but not up. */
gcc_checking_assert (0 <= adjust);
@@ -2526,8 +2526,13 @@ warn_placement_new_too_small (tree type, tree nelts, tree size, tree oper)
else if (nelts && CONSTANT_CLASS_P (nelts))
bytes_need = tree_to_uhwi (nelts)
* tree_to_uhwi (TYPE_SIZE_UNIT (type));
- else
+ else if (tree_fits_uhwi_p (TYPE_SIZE_UNIT (type)))
bytes_need = tree_to_uhwi (TYPE_SIZE_UNIT (type));
+ else
+ {
+ /* The type is a VLA. */
+ return;
+ }
if (bytes_avail < bytes_need)
{
new file mode 100644
@@ -0,0 +1,14 @@
+// PR c++/77804 - Internal compiler error on incorrect initialization of
+// new-d array
+// { dg-do compile }
+// { dg-additional-options "-Wplacement-new -Wvla -Wno-error=vla" }
+
+void* operator new[] (__SIZE_TYPE__ n, void *p) { return p; }
+
+int main()
+{
+ char buf[256];
+ unsigned n = 10;
+ int* p = new (buf) (int[n]); // { dg-warning "non-constant array new length must be specified without parentheses around the type-id" }
+ // { dg-warning "ISO C\\+\\+ forbids variable length array" "vla warning" { target *-*-* } .-1 }
+}