AArch64 AAPCS: Ignore static members

Static members in C++ structs are global data and therefore not part of the
list of struct members considered for passing in registers.

Note the corresponding code in GCC (from which the GDB AAPCS code is based)
does not have any static member checks due to the static members not being
part of the struct type at that point.

Extend gdb.base/infcall-nested-structs.exp to test structs with static
members when compiled for C++.  XFAIL more cases for x86_64 (see gdb/24104).
For completeness, ensure some test cases have both empty structures and
static members.

Also fixes gdb.dwarf2/dw2-cp-infcall-ref-static.exp.

gdb/ChangeLog:

	* aarch64-tdep.c (aapcs_is_vfp_call_or_return_candidate_1): Check
	for static members.
	(pass_in_v_vfp_candidate): Likewise.

gdb/testsuite/ChangeLog:

	* gdb.base/infcall-nested-structs.c (struct struct_static_02_01):
	New structure.
	(struct struct_static_02_02): Likewise.
	(struct struct_static_02_03): Likewise.
	(struct struct_static_02_04): Likewise.
	(struct struct_static_04_01): Likewise.
	(struct struct_static_04_02): Likewise.
	(struct struct_static_04_03): Likewise.
	(struct struct_static_04_04): Likewise.
	(struct struct_static_06_01): Likewise.
	(struct struct_static_06_02): Likewise.
	(struct struct_static_06_03): Likewise.
	(struct struct_static_06_04): Likewise.
	(cmp_struct_static_02_01): Likewise.
	(cmp_struct_static_02_02): Likewise.
	(cmp_struct_static_02_03): Likewise.
	(cmp_struct_static_02_04): Likewise.
	(cmp_struct_static_04_01): Likewise.
	(cmp_struct_static_04_02): Likewise.
	(cmp_struct_static_04_03): Likewise.
	(cmp_struct_static_04_04): Likewise.
	(cmp_struct_static_06_01): Likewise.
	(cmp_struct_static_06_02): Likewise.
	(cmp_struct_static_06_03): Likewise.
	(cmp_struct_static_06_04): Likewise.
	(call_all): Test new structs.
	* gdb.base/infcall-nested-structs.exp: Likewise.

1 files changed, 173 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.base/infcall-nested-structs.c b/gdb/testsuite/gdb.base/infcall-nested-structs.c
index 5c25956c50a..b6f793e7a33 100644
--- a/gdb/testsuite/gdb.base/infcall-nested-structs.c
+++ b/gdb/testsuite/gdb.base/infcall-nested-structs.c
@@ -21,6 +21,11 @@
    scalar fields, the fields can be inside nested structures, and there can
    be empty structures around too.
 
+   When compiled for C++ this file also tests structures containing static
+   members (which live in global memory).  In addition, empty structures in C++
+   have a size of 1 (compared to 0 in GNU C), which can effect structure
+   padding.
+
    This test is specifically written for RiscV and Aarch64, which both have
    special ABI rules for structures like these, however, there should be no harm
    in running these tests on other targets, though in many cases the
@@ -97,6 +102,32 @@ struct struct_05_02 { tA a; struct { struct { ES(es1); } s1; } s2; tB b; struct
 struct struct_05_03 { struct { struct { ES(es1); } s1; } s2; ES(es1); struct { struct { tA a; } s3; } s4; struct { struct { tB b; } s5; } s6; struct { struct { tA c; } s7; } s8; struct { struct { tB d; } s9; } s10; struct { struct { tA e; } s11; } s12;};
 struct struct_05_04 { ES(es1); ES(es2); tA a; ES(es3); tB b; ES(es4); tA c; ES(es5); tB d; ES(es6); tA e; };
 
+/* Only C++ allows structures to have static members.  */
+#ifdef __cplusplus
+
+/* Structures with two fields nested to various depths, one of which is static.
+   Some include empty structures.  */
+struct struct_static_02_01 { struct sa { struct sb { tA a; static tB b; } s1; } s2; };
+struct struct_static_02_02 { static tA a; struct { struct { ES(es1); } s1; } s2; tB b; };
+struct struct_static_02_03 { struct { struct { ES(es1); } s1; } s2; ES(es1); struct { struct { tA a; } s3; } s4; struct sa { struct sb { static tB b; } s5; } s6;};
+struct struct_static_02_04 { static tA a; tB b; };
+
+/* Structures with four fields nested to various depths, some of which are
+   static.  Some include empty structures.  */
+struct struct_static_04_01 { struct sa { struct sb { static tA a; tB b; tA c; tB d; } s1; } s2; };
+struct struct_static_04_02 { tA a; struct { struct { ES(es1); } s1; } s2; tB b; struct { struct { ES(es1); } s2; } s3; static tA c; struct { struct { ES(es2); } s4; } s5; static tB d;};
+struct struct_static_04_03 { struct sa { struct sb { static tA a; } s3; } s4; struct sc { struct sd { static tB b; } s5; } s6; struct se { struct sf { static tA c; } s7; } s8; struct sg { struct sh { static tB d; } s9; } s10;};
+struct struct_static_04_04 { ES(es1); ES(es2); tA a; ES(es3); tB b; ES(es4); tA c; ES(es5); static tB d; };
+
+/* Structures with six fields nested to various depths, some of which are
+   static.  Some include empty structures.  */
+struct struct_static_06_01 { struct sa { struct sb { tA a; static tB b; tA c; tB d; tA e; } s1; } s2; tB f; };
+struct struct_static_06_02 { tA a; static tB b; static tA c; tB d; tB e; tA f;};
+struct struct_static_06_03 { struct { struct { ES(es1); } s1; } s2; ES(es1); struct sa { struct sb { static tA a; } s3; } s4; struct sc { struct sd { tB b; } s5; } s6; struct se { struct sf { static tA c; } s7; } s8; struct sg { struct sh { static tB d; } s9; } s10; struct { struct { tA e; tB f; } s11; } s12;};
+struct struct_static_06_04 { ES(es1); ES(es2); static tA a; ES(es3); static tB b; ES(es4); static tA c; ES(es5); static tB d; ES(es6); static tA e; ES(es7); tB f; };
+
+#endif
+
 int cmp_struct_01_01 (struct struct_01_01 a, struct struct_01_01 b)
 { return a.s2.s1.a == b.s2.s1.a; }
 
@@ -151,6 +182,78 @@ int cmp_struct_05_03 (struct struct_05_03 a, struct struct_05_03 b)
 int cmp_struct_05_04 (struct struct_05_04 a, struct struct_05_04 b)
 { return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d && a.e == b.e; }
 
+#ifdef __cplusplus
+
+int
+cmp_struct_static_02_01 (struct struct_static_02_01 a,
+			 struct struct_static_02_01 b)
+{ return a.s2.s1.a == b.s2.s1.a && a.s2.s1.b == a.s2.s1.b; }
+
+int
+cmp_struct_static_02_02 (struct struct_static_02_02 a,
+			 struct struct_static_02_02 b)
+{ return a.a == b.a && a.b == b.b; }
+
+int
+cmp_struct_static_02_03 (struct struct_static_02_03 a,
+			 struct struct_static_02_03 b)
+{ return a.s4.s3.a == b.s4.s3.a && a.s6.s5.b == b.s6.s5.b; }
+
+int
+cmp_struct_static_02_04 (struct struct_static_02_04 a,
+			     struct struct_static_02_04 b)
+{ return a.a == b.a && a.b == b.b; }
+
+int
+cmp_struct_static_04_01 (struct struct_static_04_01 a,
+			 struct struct_static_04_01 b)
+{ return a.s2.s1.a == b.s2.s1.a && a.s2.s1.b == a.s2.s1.b
+	 && a.s2.s1.c == b.s2.s1.c && a.s2.s1.d == a.s2.s1.d; }
+
+int
+cmp_struct_static_04_02 (struct struct_static_04_02 a,
+			 struct struct_static_04_02 b)
+{ return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d; }
+
+int
+cmp_struct_static_04_03 (struct struct_static_04_03 a,
+			 struct struct_static_04_03 b)
+{ return a.s4.s3.a == b.s4.s3.a && a.s6.s5.b == b.s6.s5.b
+	 && a.s8.s7.c == b.s8.s7.c && a.s10.s9.d == b.s10.s9.d; }
+
+int
+cmp_struct_static_04_04 (struct struct_static_04_04 a,
+			 struct struct_static_04_04 b)
+{ return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d; }
+
+int
+cmp_struct_static_06_01 (struct struct_static_06_01 a,
+			 struct struct_static_06_01 b)
+{ return a.s2.s1.a == b.s2.s1.a && a.s2.s1.b == a.s2.s1.b
+	 && a.s2.s1.c == b.s2.s1.c && a.s2.s1.d == a.s2.s1.d
+	 && a.s2.s1.e == b.s2.s1.e && a.f == b.f; }
+
+int
+cmp_struct_static_06_02 (struct struct_static_06_02 a,
+			 struct struct_static_06_02 b)
+{ return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d && a.e == b.e
+	 && a.f == b.f; }
+
+int
+cmp_struct_static_06_03 (struct struct_static_06_03 a,
+			 struct struct_static_06_03 b)
+{ return a.s4.s3.a == b.s4.s3.a && a.s6.s5.b == b.s6.s5.b
+	 && a.s8.s7.c == b.s8.s7.c && a.s10.s9.d == b.s10.s9.d
+	 && a.s12.s11.e == b.s12.s11.e && a.s12.s11.f == b.s12.s11.f; }
+
+int
+cmp_struct_static_06_04 (struct struct_static_06_04 a,
+			 struct struct_static_06_04 b)
+{ return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d && a.e == b.e
+	 && a.f == b.f; }
+
+#endif
+
 REF_VAL(struct_01_01) = { {}, { { 'a' } } };
 REF_VAL(struct_01_02) = { 'a', { { {} } } };
 REF_VAL(struct_01_03) = { { { {} } }, {}, { { 'a' } } };
@@ -171,6 +274,48 @@ REF_VAL(struct_05_02) = { 'a', { { {} } }, 'b', { { {} } }, 'c', { { {} } }, 'd'
 REF_VAL(struct_05_03) = { { { {} } }, {}, { { 'a' } }, { { 'b' } }, { { 'c' } }, { { 'd' } }, { { 'e' } } };
 REF_VAL(struct_05_04) = { {}, {}, 'a', {}, 'b', {}, 'c', {}, 'd', {}, 'e' };
 
+#ifdef __cplusplus
+
+/* Initialise static members.  */
+tB struct_static_02_01::sa::sb::b = '1';
+tA struct_static_02_02::a = '2';
+tB struct_static_02_03::sa::sb::b = '3';
+tA struct_static_02_04::a = '4';
+tA struct_static_04_01::sa::sb::a = '5';
+tA struct_static_04_02::c = '6';
+tB struct_static_04_02::d = '7';
+tA struct_static_04_03::sa::sb::a = '8';
+tB struct_static_04_03::sc::sd::b = '9';
+tA struct_static_04_03::se::sf::c = '0';
+tB struct_static_04_03::sg::sh::d = 'A';
+tB struct_static_04_04::d = 'B';
+tB struct_static_06_01::sa::sb::b = 'C';
+tB struct_static_06_02::b = 'D';
+tA struct_static_06_02::c = 'E';
+tA struct_static_06_03::sa::sb::a = 'F';
+tA struct_static_06_03::se::sf::c = 'G';
+tB struct_static_06_03::sg::sh::d = 'H';
+tA struct_static_06_04::a = 'I';
+tB struct_static_06_04::b = 'J';
+tA struct_static_06_04::c = 'K';
+tB struct_static_06_04::d = 'L';
+tA struct_static_06_04::e = 'M';
+
+REF_VAL(struct_static_02_01) = { { { 'a' } } };
+REF_VAL(struct_static_02_02) = { { { {} } }, 'b' };
+REF_VAL(struct_static_02_03) = { { { {} } }, {}, { { 'a' } }, { { } } };
+REF_VAL(struct_static_02_04) = { 'b' };
+REF_VAL(struct_static_04_01) = { { { 'b', 'c', 'd' } } };
+REF_VAL(struct_static_04_02) = { 'a', { { {} } }, 'b', { { {} } }, { { {} } } };
+REF_VAL(struct_static_04_03) = {};
+REF_VAL(struct_static_04_04) = { {}, {}, 'a', {}, 'b', {}, 'c', {} };
+REF_VAL(struct_static_06_01) = { { { 'a', 'c', 'd', 'e' } }, 'f' };
+REF_VAL(struct_static_06_02) = { 'a', 'd', 'e', 'f' };
+REF_VAL(struct_static_06_03) = { { { {} } }, {}, {}, { { 'b' } }, {}, /*{ { 'e', 'f' } }*/ };
+REF_VAL(struct_static_06_04) = { {}, {}, {}, {}, {}, {}, {}, 'f' };
+
+#endif
+
 /* Create all of the functions GDB will call to check functionality.  */
 MAKE_CHECK_FUNCS(struct_01_01)
 MAKE_CHECK_FUNCS(struct_01_02)
@@ -188,6 +333,20 @@ MAKE_CHECK_FUNCS(struct_05_01)
 MAKE_CHECK_FUNCS(struct_05_02)
 MAKE_CHECK_FUNCS(struct_05_03)
 MAKE_CHECK_FUNCS(struct_05_04)
+#ifdef __cplusplus
+MAKE_CHECK_FUNCS(struct_static_02_01)
+MAKE_CHECK_FUNCS(struct_static_02_02)
+MAKE_CHECK_FUNCS(struct_static_02_03)
+MAKE_CHECK_FUNCS(struct_static_02_04)
+MAKE_CHECK_FUNCS(struct_static_04_01)
+MAKE_CHECK_FUNCS(struct_static_04_02)
+MAKE_CHECK_FUNCS(struct_static_04_03)
+MAKE_CHECK_FUNCS(struct_static_04_04)
+MAKE_CHECK_FUNCS(struct_static_06_01)
+MAKE_CHECK_FUNCS(struct_static_06_02)
+MAKE_CHECK_FUNCS(struct_static_06_03)
+MAKE_CHECK_FUNCS(struct_static_06_04)
+#endif
 
 #define CALL_LINE(NAME) val += check_arg_ ## NAME (rtn_str_ ## NAME ())
 
@@ -212,6 +371,20 @@ call_all ()
   CALL_LINE(struct_05_02);
   CALL_LINE(struct_05_03);
   CALL_LINE(struct_05_04);
+#ifdef __cplusplus
+  CALL_LINE(struct_static_02_01);
+  CALL_LINE(struct_static_02_02);
+  CALL_LINE(struct_static_02_03);
+  CALL_LINE(struct_static_02_04);
+  CALL_LINE(struct_static_04_01);
+  CALL_LINE(struct_static_04_02);
+  CALL_LINE(struct_static_04_03);
+  CALL_LINE(struct_static_04_04);
+  CALL_LINE(struct_static_06_01);
+  CALL_LINE(struct_static_06_02);
+  CALL_LINE(struct_static_06_03);
+  CALL_LINE(struct_static_06_04);
+#endif
 
   return (val != 4);
 }