Hi!
My recent change to get_narrower/warnings_for_convert_and_check broke
the following testcase, warnings_for_convert_and_check is upset that
expr is a COMPOUND_EXPR with INTEGER_CST at the rightmost operand, while
result is a COMPOUND_EXPR with a NOP_EXPR of INTEGER_CST at the rightmost
operand, it expects such conversions to be simplified.
The easiest fix seems to be to handle COMPOUND_EXPRs in ocp_convert too,
by converting the rightmost operand and recreating COMPOUND_EXPR(s) if that
changed.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
The attr-copy-2.C change is a workaround for PR94346, where we now ICE on
the testcase, while previously we'd ICE only if it contained a comma
expression at the outer level rather than cast of a COMPOUND_EXPR to
something. I'll defer that to Martin.
2020-03-26 Jakub Jelinek <ja...@redhat.com>
PR c++/94339
* cvt.c (ocp_convert): Handle COMPOUND_EXPR by recursion on the second
operand and creating a new COMPOUND_EXPR if anything changed.
* g++.dg/other/pr94339.C: New test.
* g++.dg/ext/attr-copy-2.C: Comment out failing tests due to PR94346.
--- gcc/cp/cvt.c.jj 2020-01-12 11:54:36.000000000 +0100
+++ gcc/cp/cvt.c 2020-03-26 12:30:52.312170071 +0100
@@ -697,6 +697,17 @@ ocp_convert (tree type, tree expr, int c
if (error_operand_p (e) || type == error_mark_node)
return error_mark_node;
+ if (TREE_CODE (e) == COMPOUND_EXPR)
+ {
+ e = ocp_convert (type, TREE_OPERAND (e, 1), convtype, flags, complain);
+ if (e == error_mark_node)
+ return error_mark_node;
+ if (e == TREE_OPERAND (expr, 1))
+ return expr;
+ return build2_loc (EXPR_LOCATION (expr), COMPOUND_EXPR, TREE_TYPE (e),
+ TREE_OPERAND (expr, 0), e);
+ }
+
complete_type (type);
complete_type (TREE_TYPE (expr));
--- gcc/testsuite/g++.dg/other/pr94339.C.jj 2020-03-26 12:37:01.645664573
+0100
+++ gcc/testsuite/g++.dg/other/pr94339.C 2020-03-26 12:32:36.217621191
+0100
@@ -0,0 +1,11 @@
+// PR c++/94339
+// { dg-do compile }
+
+unsigned a;
+void bar ();
+
+unsigned
+foo (bool x)
+{
+ return x ? bar (), -1 : a;
+}
--- gcc/testsuite/g++.dg/ext/attr-copy-2.C.jj 2020-01-12 11:54:37.000000000
+0100
+++ gcc/testsuite/g++.dg/ext/attr-copy-2.C 2020-03-26 20:05:34.464882638
+0100
@@ -36,8 +36,8 @@ typedef struct C
ATTR (copy (*(struct A *)(0, 1))) long m_xpa_0_1;
ATTR (copy (((struct A *)0)[0])) short m_arpa_0;
- ATTR (copy (((struct A *)(1, 0))[0])) int m_arpa_1_0;
- ATTR (copy (((struct A *)(0, 1))[0])) long m_arpa_0_1;
+// ATTR (copy (((struct A *)(1, 0))[0])) int m_arpa_1_0;
+// ATTR (copy (((struct A *)(0, 1))[0])) long m_arpa_0_1;
ATTR (copy (a)) short m_a;
ATTR (copy (b.a)) int m_b_a;
@@ -86,8 +86,8 @@ static_assert (__builtin_has_attribute (
static_assert (__builtin_has_attribute (((C*)0)->m_ra, packed));
static_assert (__builtin_has_attribute (((C*)0)->m_arpa_0, packed));
-static_assert (__builtin_has_attribute (((C*)0)->m_arpa_1_0, packed));
-static_assert (__builtin_has_attribute (((C*)0)->m_arpa_0_1, packed));
+//static_assert (__builtin_has_attribute (((C*)0)->m_arpa_1_0, packed));
+//static_assert (__builtin_has_attribute (((C*)0)->m_arpa_0_1, packed));
static_assert (__builtin_has_attribute (((C*)0)->m_a, packed));
static_assert (__builtin_has_attribute (((C*)0)->m_b_a, packed));
Jakub
