I made a mistake in r12-7962 and it causes an ICE running g++.dg-struct-
layout-1 tests. The fix and a reduced test are included in this patch.
Ok for trunk?
--------------------
DECL_SIZE(x) is NULL if x is a flexible array member, but I forgot to
check it in r12-7962. Then if we increase the size of a struct with
flexible array member (by using aligned attribute), the code will
dereference NULL trying to use the "size" of the flexible array member.
gcc/
* config/mips/mips.cc (mips_function_arg): Check if DECL_SIZE is
NULL before dereferencing it.
gcc/testsuite/
* gcc.target/mips/pr102024-4.c: New test.
---
gcc/config/mips/mips.cc | 3 ++-
gcc/testsuite/gcc.target/mips/pr102024-4.c | 10 ++++++++++
2 files changed, 12 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.target/mips/pr102024-4.c
diff --git a/gcc/config/mips/mips.cc b/gcc/config/mips/mips.cc
index a6dd1e9e7b6..079bb03968a 100644
--- a/gcc/config/mips/mips.cc
+++ b/gcc/config/mips/mips.cc
@@ -6082,7 +6082,8 @@ mips_function_arg (cumulative_args_t cum_v, const
function_arg_info &arg)
an ABI change. */
if (DECL_FIELD_CXX_ZERO_WIDTH_BIT_FIELD (field))
continue;
- if (integer_zerop (DECL_SIZE (field)))
+ if (DECL_SIZE (field)
+ && integer_zerop (DECL_SIZE (field)))
{
zero_width_field_abi_change = true;
continue;
diff --git a/gcc/testsuite/gcc.target/mips/pr102024-4.c
b/gcc/testsuite/gcc.target/mips/pr102024-4.c
new file mode 100644
index 00000000000..2147cc769d0
--- /dev/null
+++ b/gcc/testsuite/gcc.target/mips/pr102024-4.c
@@ -0,0 +1,10 @@
+// { dg-do compile }
+// { dg-options "-mabi=64 -mhard-float" }
+
+struct __attribute__((aligned(16))) test {
+ int x[0];
+ double b;
+ int f[];
+};
+
+void check(struct test) {} // { dg-message "the ABI for passing a value
containing zero-width fields before an adjacent 64-bit floating-point field was
changed in GCC 12.1" }
--
2.35.1
