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Tue, 30 May 2023 18:30:38 +0000 Received: from CH2PR10MB4344.namprd10.prod.outlook.com ([fe80::346b:de36:41d7:b1e4]) by CH2PR10MB4344.namprd10.prod.outlook.com ([fe80::346b:de36:41d7:b1e4%4]) with mapi id 15.20.6433.022; Tue, 30 May 2023 18:30:38 +0000 To: joseph@codesourcery.com, richard.guenther@gmail.com, jakub@redhat.com, gcc-patches@gcc.gnu.org Cc: keescook@chromium.org, siddhesh@gotplt.org, uecker@tugraz.at, Qing Zhao Subject: [V9][PATCH 1/2] Handle component_ref to a structre/union field including flexible array member [PR101832] Date: Tue, 30 May 2023 18:30:28 +0000 Message-Id: <20230530183029.1156862-2-qing.zhao@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230530183029.1156862-1-qing.zhao@oracle.com> References: <20230530183029.1156862-1-qing.zhao@oracle.com> X-ClientProxiedBy: SN7P220CA0028.NAMP220.PROD.OUTLOOK.COM (2603:10b6:806:123::33) To CH2PR10MB4344.namprd10.prod.outlook.com (2603:10b6:610:af::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR10MB4344:EE_|PH7PR10MB7033:EE_ X-MS-Office365-Filtering-Correlation-Id: 3dbca034-63ae-4c2d-04c8-08db613bf75e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Qing =================================== GCC extension accepts the case when a struct with a C99 flexible array member is embedded into another struct or union (possibly recursively) as the last field. __builtin_object_size should treat such struct as flexible size. gcc/c/ChangeLog: PR tree-optimization/101832 * c-decl.cc (finish_struct): Set TYPE_INCLUDES_FLEXARRAY for struct/union type. gcc/lto/ChangeLog: PR tree-optimization/101832 * lto-common.cc (compare_tree_sccs_1): Compare bit TYPE_NO_NAMED_ARGS_STDARG_P or TYPE_INCLUDES_FLEXARRAY properly for its corresponding type. gcc/ChangeLog: PR tree-optimization/101832 * print-tree.cc (print_node): Print new bit type_includes_flexarray. * tree-core.h (struct tree_type_common): Use bit no_named_args_stdarg_p as type_includes_flexarray for RECORD_TYPE or UNION_TYPE. * tree-object-size.cc (addr_object_size): Handle structure/union type when it has flexible size. * tree-streamer-in.cc (unpack_ts_type_common_value_fields): Stream in bit no_named_args_stdarg_p properly for its corresponding type. * tree-streamer-out.cc (pack_ts_type_common_value_fields): Stream out bit no_named_args_stdarg_p properly for its corresponding type. * tree.h (TYPE_INCLUDES_FLEXARRAY): New macro TYPE_INCLUDES_FLEXARRAY. gcc/testsuite/ChangeLog: PR tree-optimization/101832 * gcc.dg/builtin-object-size-pr101832.c: New test. change TYPE_INCLUDES_FLEXARRAY to TYPE_INCLUDES_FLEXARRAY --- gcc/c/c-decl.cc | 11 ++ gcc/lto/lto-common.cc | 5 +- gcc/print-tree.cc | 5 + .../gcc.dg/builtin-object-size-pr101832.c | 134 ++++++++++++++++++ gcc/tree-core.h | 2 + gcc/tree-object-size.cc | 23 ++- gcc/tree-streamer-in.cc | 5 +- gcc/tree-streamer-out.cc | 5 +- gcc/tree.h | 7 +- 9 files changed, 192 insertions(+), 5 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/builtin-object-size-pr101832.c diff --git a/gcc/c/c-decl.cc b/gcc/c/c-decl.cc index b5b491cf2da..0c718151f6d 100644 --- a/gcc/c/c-decl.cc +++ b/gcc/c/c-decl.cc @@ -9282,6 +9282,17 @@ finish_struct (location_t loc, tree t, tree fieldlist, tree attributes, /* Set DECL_NOT_FLEXARRAY flag for FIELD_DECL x. */ DECL_NOT_FLEXARRAY (x) = !is_flexible_array_member_p (is_last_field, x); + /* Set TYPE_INCLUDES_FLEXARRAY for the context of x, t. + when x is an array and is the last field. */ + if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE) + TYPE_INCLUDES_FLEXARRAY (t) + = is_last_field && flexible_array_member_type_p (TREE_TYPE (x)); + /* Recursively set TYPE_INCLUDES_FLEXARRAY for the context of x, t + when x is an union or record and is the last field. */ + else if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (x))) + TYPE_INCLUDES_FLEXARRAY (t) + = is_last_field && TYPE_INCLUDES_FLEXARRAY (TREE_TYPE (x)); + if (DECL_NAME (x) || RECORD_OR_UNION_TYPE_P (TREE_TYPE (x))) saw_named_field = true; diff --git a/gcc/lto/lto-common.cc b/gcc/lto/lto-common.cc index 537570204b3..f6b85bbc6f7 100644 --- a/gcc/lto/lto-common.cc +++ b/gcc/lto/lto-common.cc @@ -1275,7 +1275,10 @@ compare_tree_sccs_1 (tree t1, tree t2, tree **map) if (AGGREGATE_TYPE_P (t1)) compare_values (TYPE_TYPELESS_STORAGE); compare_values (TYPE_EMPTY_P); - compare_values (TYPE_NO_NAMED_ARGS_STDARG_P); + if (FUNC_OR_METHOD_TYPE_P (t1)) + compare_values (TYPE_NO_NAMED_ARGS_STDARG_P); + if (RECORD_OR_UNION_TYPE_P (t1)) + compare_values (TYPE_INCLUDES_FLEXARRAY); compare_values (TYPE_PACKED); compare_values (TYPE_RESTRICT); compare_values (TYPE_USER_ALIGN); diff --git a/gcc/print-tree.cc b/gcc/print-tree.cc index ccecd3dc6a7..62451b6cf4e 100644 --- a/gcc/print-tree.cc +++ b/gcc/print-tree.cc @@ -632,6 +632,11 @@ print_node (FILE *file, const char *prefix, tree node, int indent, && TYPE_CXX_ODR_P (node)) fputs (" cxx-odr-p", file); + if ((code == RECORD_TYPE + || code == UNION_TYPE) + && TYPE_INCLUDES_FLEXARRAY (node)) + fputs (" includes-flexarray", file); + /* The transparent-union flag is used for different things in different nodes. */ if ((code == UNION_TYPE || code == RECORD_TYPE) diff --git a/gcc/testsuite/gcc.dg/builtin-object-size-pr101832.c b/gcc/testsuite/gcc.dg/builtin-object-size-pr101832.c new file mode 100644 index 00000000000..60078e11634 --- /dev/null +++ b/gcc/testsuite/gcc.dg/builtin-object-size-pr101832.c @@ -0,0 +1,134 @@ +/* PR 101832: + GCC extension accepts the case when a struct with a C99 flexible array + member is embedded into another struct (possibly recursively). + __builtin_object_size will treat such struct as flexible size. + However, when a structure with non-C99 flexible array member, i.e, trailing + [0], [1], or [4], is embedded into anther struct, the stucture will not + be treated as flexible size. */ +/* { dg-do run } */ +/* { dg-options "-O2" } */ + +#include "builtin-object-size-common.h" + +#define expect(p, _v) do { \ + size_t v = _v; \ + if (p == v) \ + __builtin_printf ("ok: %s == %zd\n", #p, p); \ + else {\ + __builtin_printf ("WAT: %s == %zd (expected %zd)\n", #p, p, v); \ + FAIL (); \ + } \ +} while (0); + + +struct A { + int n; + char data[]; +}; + +struct B { + int m; + struct A a; +}; + +struct C { + int q; + struct B b; +}; + +struct A0 { + int n; + char data[0]; +}; + +struct B0 { + int m; + struct A0 a; +}; + +struct C0 { + int q; + struct B0 b; +}; + +struct A1 { + int n; + char data[1]; +}; + +struct B1 { + int m; + struct A1 a; +}; + +struct C1 { + int q; + struct B1 b; +}; + +struct An { + int n; + char data[8]; +}; + +struct Bn { + int m; + struct An a; +}; + +struct Cn { + int q; + struct Bn b; +}; + +volatile void *magic1, *magic2; + +int main (int argc, char *argv[]) +{ + struct B *outer; + struct C *outest; + + /* Make sure optimization can't find some other object size. */ + outer = (void *)magic1; + outest = (void *)magic2; + + expect (__builtin_object_size (&outer->a, 1), -1); + expect (__builtin_object_size (&outest->b, 1), -1); + expect (__builtin_object_size (&outest->b.a, 1), -1); + + struct B0 *outer0; + struct C0 *outest0; + + /* Make sure optimization can't find some other object size. */ + outer0 = (void *)magic1; + outest0 = (void *)magic2; + + expect (__builtin_object_size (&outer0->a, 1), sizeof (outer0->a)); + expect (__builtin_object_size (&outest0->b, 1), sizeof (outest0->b)); + expect (__builtin_object_size (&outest0->b.a, 1), sizeof (outest0->b.a)); + + struct B1 *outer1; + struct C1 *outest1; + + /* Make sure optimization can't find some other object size. */ + outer1 = (void *)magic1; + outest1 = (void *)magic2; + + expect (__builtin_object_size (&outer1->a, 1), sizeof (outer1->a)); + expect (__builtin_object_size (&outest1->b, 1), sizeof (outest1->b)); + expect (__builtin_object_size (&outest1->b.a, 1), sizeof (outest1->b.a)); + + struct Bn *outern; + struct Cn *outestn; + + /* Make sure optimization can't find some other object size. */ + outern = (void *)magic1; + outestn = (void *)magic2; + + expect (__builtin_object_size (&outern->a, 1), sizeof (outern->a)); + expect (__builtin_object_size (&outestn->b, 1), sizeof (outestn->b)); + expect (__builtin_object_size (&outestn->b.a, 1), sizeof (outestn->b.a)); + + DONE (); + return 0; +} diff --git a/gcc/tree-core.h b/gcc/tree-core.h index 9d44c04bf03..b2f619c5efc 100644 --- a/gcc/tree-core.h +++ b/gcc/tree-core.h @@ -1712,6 +1712,8 @@ struct GTY(()) tree_type_common { unsigned typeless_storage : 1; unsigned empty_flag : 1; unsigned indivisible_p : 1; + /* TYPE_NO_NAMED_ARGS_STDARG_P for a stdarg function. + Or TYPE_INCLUDES_FLEXARRAY for RECORD_TYPE and UNION_TYPE. */ unsigned no_named_args_stdarg_p : 1; unsigned spare : 1; diff --git a/gcc/tree-object-size.cc b/gcc/tree-object-size.cc index 9a936a91983..a62af050056 100644 --- a/gcc/tree-object-size.cc +++ b/gcc/tree-object-size.cc @@ -633,11 +633,32 @@ addr_object_size (struct object_size_info *osi, const_tree ptr, v = NULL_TREE; break; case COMPONENT_REF: - if (TREE_CODE (TREE_TYPE (v)) != ARRAY_TYPE) + /* When the ref is not to an aggregate type, i.e, an array, + a record or a union, it will not have flexible size, + compute the object size directly. */ + if (!AGGREGATE_TYPE_P (TREE_TYPE (v))) { v = NULL_TREE; break; } + /* if the ref is to a record or union type, but the type + does not include a flexible array recursively, compute + the object size directly. */ + if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (v))) + { + if (!TYPE_INCLUDES_FLEXARRAY (TREE_TYPE (v))) + { + v = NULL_TREE; + break; + } + else + { + v = TREE_OPERAND (v, 0); + break; + } + } + /* Now the ref is to an array type. */ + gcc_assert (TREE_CODE (TREE_TYPE (v)) == ARRAY_TYPE); is_flexible_array_mem_ref = array_ref_flexible_size_p (v); while (v != pt_var && TREE_CODE (v) == COMPONENT_REF) if (TREE_CODE (TREE_TYPE (TREE_OPERAND (v, 0))) diff --git a/gcc/tree-streamer-in.cc b/gcc/tree-streamer-in.cc index c803800862c..be2bdbb7699 100644 --- a/gcc/tree-streamer-in.cc +++ b/gcc/tree-streamer-in.cc @@ -386,7 +386,10 @@ unpack_ts_type_common_value_fields (struct bitpack_d *bp, tree expr) if (AGGREGATE_TYPE_P (expr)) TYPE_TYPELESS_STORAGE (expr) = (unsigned) bp_unpack_value (bp, 1); TYPE_EMPTY_P (expr) = (unsigned) bp_unpack_value (bp, 1); - TYPE_NO_NAMED_ARGS_STDARG_P (expr) = (unsigned) bp_unpack_value (bp, 1); + if (FUNC_OR_METHOD_TYPE_P (expr)) + TYPE_NO_NAMED_ARGS_STDARG_P (expr) = (unsigned) bp_unpack_value (bp, 1); + if (RECORD_OR_UNION_TYPE_P (expr)) + TYPE_INCLUDES_FLEXARRAY (expr) = (unsigned) bp_unpack_value (bp, 1); TYPE_PRECISION (expr) = bp_unpack_var_len_unsigned (bp); SET_TYPE_ALIGN (expr, bp_unpack_var_len_unsigned (bp)); #ifdef ACCEL_COMPILER diff --git a/gcc/tree-streamer-out.cc b/gcc/tree-streamer-out.cc index 5751f77273b..6d4a9d90da6 100644 --- a/gcc/tree-streamer-out.cc +++ b/gcc/tree-streamer-out.cc @@ -355,7 +355,10 @@ pack_ts_type_common_value_fields (struct bitpack_d *bp, tree expr) if (AGGREGATE_TYPE_P (expr)) bp_pack_value (bp, TYPE_TYPELESS_STORAGE (expr), 1); bp_pack_value (bp, TYPE_EMPTY_P (expr), 1); - bp_pack_value (bp, TYPE_NO_NAMED_ARGS_STDARG_P (expr), 1); + if (FUNC_OR_METHOD_TYPE_P (expr)) + bp_pack_value (bp, TYPE_NO_NAMED_ARGS_STDARG_P (expr), 1); + if (RECORD_OR_UNION_TYPE_P (expr)) + bp_pack_value (bp, TYPE_INCLUDES_FLEXARRAY (expr), 1); bp_pack_var_len_unsigned (bp, TYPE_PRECISION (expr)); bp_pack_var_len_unsigned (bp, TYPE_ALIGN (expr)); } diff --git a/gcc/tree.h b/gcc/tree.h index 0b72663e6a1..d4755317a4c 100644 --- a/gcc/tree.h +++ b/gcc/tree.h @@ -786,7 +786,12 @@ extern void omp_clause_range_check_failed (const_tree, const char *, int, (...) prototype, where arguments can be accessed with va_start and va_arg), as opposed to an unprototyped function. */ #define TYPE_NO_NAMED_ARGS_STDARG_P(NODE) \ - (TYPE_CHECK (NODE)->type_common.no_named_args_stdarg_p) + (FUNC_OR_METHOD_CHECK (NODE)->type_common.no_named_args_stdarg_p) + +/* True if this RECORD_TYPE or UNION_TYPE includes a flexible array member + as the last field recursively. */ +#define TYPE_INCLUDES_FLEXARRAY(NODE) \ + (RECORD_OR_UNION_CHECK (NODE)->type_common.no_named_args_stdarg_p) /* In an IDENTIFIER_NODE, this means that assemble_name was called with this string as an argument. */ From patchwork Tue May 30 18:30:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qing Zhao X-Patchwork-Id: 101071 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:994d:0:b0:3d9:f83d:47d9 with SMTP id k13csp2381138vqr; 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30 May 2023 18:30:43 +0000 To: joseph@codesourcery.com, richard.guenther@gmail.com, jakub@redhat.com, gcc-patches@gcc.gnu.org Cc: keescook@chromium.org, siddhesh@gotplt.org, uecker@tugraz.at, Qing Zhao Subject: [V9][PATCH 2/2] Update documentation to clarify a GCC extension [PR77650] Date: Tue, 30 May 2023 18:30:29 +0000 Message-Id: <20230530183029.1156862-3-qing.zhao@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230530183029.1156862-1-qing.zhao@oracle.com> References: <20230530183029.1156862-1-qing.zhao@oracle.com> X-ClientProxiedBy: DM6PR21CA0016.namprd21.prod.outlook.com (2603:10b6:5:174::26) To CH2PR10MB4344.namprd10.prod.outlook.com (2603:10b6:610:af::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR10MB4344:EE_|PH7PR10MB7033:EE_ X-MS-Office365-Filtering-Correlation-Id: dd611da6-9871-4aa5-c507-08db613bfa26 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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X-GMAIL-THRID: =?utf-8?q?1767345013171270107?= X-GMAIL-MSGID: =?utf-8?q?1767345013171270107?= Joseph, could you please review this patch and see whether it's Okay for commit now? thanks a lot for all your comments and suggestions for this patch. Qing. ====================================== on a structure with a C99 flexible array member being nested in another structure. "The GCC extension accepts a structure containing an ISO C99 "flexible array member", or a union containing such a structure (possibly recursively) to be a member of a structure. There are two situations: * A structure containing a C99 flexible array member, or a union containing such a structure, is the last field of another structure, for example: struct flex { int length; char data[]; }; union union_flex { int others; struct flex f; }; struct out_flex_struct { int m; struct flex flex_data; }; struct out_flex_union { int n; union union_flex flex_data; }; In the above, both 'out_flex_struct.flex_data.data[]' and 'out_flex_union.flex_data.f.data[]' are considered as flexible arrays too. * A structure containing a C99 flexible array member, or a union containing such a structure, is not the last field of another structure, for example: struct flex { int length; char data[]; }; struct mid_flex { int m; struct flex flex_data; int n; }; In the above, accessing a member of the array 'mid_flex.flex_data.data[]' might have undefined behavior. Compilers do not handle such a case consistently, Any code relying on this case should be modified to ensure that flexible array members only end up at the ends of structures. Please use the warning option '-Wflex-array-member-not-at-end' to identify all such cases in the source code and modify them. This extension is now deprecated. " gcc/c-family/ChangeLog: * c.opt: New option -Wflex-array-member-not-at-end. gcc/c/ChangeLog: * c-decl.cc (finish_struct): Issue warnings for new option. gcc/ChangeLog: * doc/extend.texi: Document GCC extension on a structure containing a flexible array member to be a member of another structure. gcc/testsuite/ChangeLog: * gcc.dg/variable-sized-type-flex-array.c: New test. --- gcc/c-family/c.opt | 5 +++ gcc/c/c-decl.cc | 9 ++++ gcc/doc/extend.texi | 44 ++++++++++++++++++- .../gcc.dg/variable-sized-type-flex-array.c | 31 +++++++++++++ 4 files changed, 88 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/gcc.dg/variable-sized-type-flex-array.c diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt index 3333cddeece..c26d9801b63 100644 --- a/gcc/c-family/c.opt +++ b/gcc/c-family/c.opt @@ -737,6 +737,11 @@ Wformat-truncation= C ObjC C++ LTO ObjC++ Joined RejectNegative UInteger Var(warn_format_trunc) Warning LangEnabledBy(C ObjC C++ LTO ObjC++,Wformat=, warn_format >= 1, 0) IntegerRange(0, 2) Warn about calls to snprintf and similar functions that truncate output. +Wflex-array-member-not-at-end +C C++ Var(warn_flex_array_member_not_at_end) Warning +Warn when a structure containing a C99 flexible array member as the last +field is not at the end of another structure. + Wif-not-aligned C ObjC C++ ObjC++ Var(warn_if_not_aligned) Init(1) Warning Warn when the field in a struct is not aligned. diff --git a/gcc/c/c-decl.cc b/gcc/c/c-decl.cc index 0c718151f6d..a1a8e9bd341 100644 --- a/gcc/c/c-decl.cc +++ b/gcc/c/c-decl.cc @@ -9293,6 +9293,15 @@ finish_struct (location_t loc, tree t, tree fieldlist, tree attributes, TYPE_INCLUDES_FLEXARRAY (t) = is_last_field && TYPE_INCLUDES_FLEXARRAY (TREE_TYPE (x)); + if (warn_flex_array_member_not_at_end + && !is_last_field + && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x)) + && TYPE_INCLUDES_FLEXARRAY (TREE_TYPE (x))) + warning_at (DECL_SOURCE_LOCATION (x), + OPT_Wflex_array_member_not_at_end, + "structure containing a flexible array member" + " is not at the end of another structure"); + if (DECL_NAME (x) || RECORD_OR_UNION_TYPE_P (TREE_TYPE (x))) saw_named_field = true; diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index ed8b9c8a87b..aa1ecb6968e 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -1751,7 +1751,49 @@ Flexible array members may only appear as the last member of a A structure containing a flexible array member, or a union containing such a structure (possibly recursively), may not be a member of a structure or an element of an array. (However, these uses are -permitted by GCC as extensions.) +permitted by GCC as extensions, see details below.) +@end itemize + +The GCC extension accepts a structure containing an ISO C99 @dfn{flexible array +member}, or a union containing such a structure (possibly recursively) +to be a member of a structure. + +There are two situations: + +@itemize @bullet +@item +A structure containing a C99 flexible array member, or a union containing +such a structure, is the last field of another structure, for example: + +@smallexample +struct flex @{ int length; char data[]; @}; +union union_flex @{ int others; struct flex f; @}; + +struct out_flex_struct @{ int m; struct flex flex_data; @}; +struct out_flex_union @{ int n; union union_flex flex_data; @}; +@end smallexample + +In the above, both @code{out_flex_struct.flex_data.data[]} and +@code{out_flex_union.flex_data.f.data[]} are considered as flexible arrays too. + +@item +A structure containing a C99 flexible array member, or a union containing +such a structure, is not the last field of another structure, for example: + +@smallexample +struct flex @{ int length; char data[]; @}; + +struct mid_flex @{ int m; struct flex flex_data; int n; @}; +@end smallexample + +In the above, accessing a member of the array @code{mid_flex.flex_data.data[]} +might have undefined behavior. Compilers do not handle such a case +consistently. Any code relying on this case should be modified to ensure +that flexible array members only end up at the ends of structures. + +Please use the warning option @option{-Wflex-array-member-not-at-end} to +identify all such cases in the source code and modify them. This extension +is now deprecated. @end itemize Non-empty initialization of zero-length diff --git a/gcc/testsuite/gcc.dg/variable-sized-type-flex-array.c b/gcc/testsuite/gcc.dg/variable-sized-type-flex-array.c new file mode 100644 index 00000000000..3924937bad4 --- /dev/null +++ b/gcc/testsuite/gcc.dg/variable-sized-type-flex-array.c @@ -0,0 +1,31 @@ +/* Test for -Wflex-array-member-not-at-end on structure/union with + C99 flexible array members being embedded into another structure. */ +/* { dg-do compile } */ +/* { dg-options "-Wflex-array-member-not-at-end" } */ + +struct flex { int n; int data[]; }; +struct out_flex_end { int m; struct flex flex_data; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */ +struct out_flex_mid { struct flex flex_data; int m; }; /* { dg-warning "structure containing a flexible array member is not at the end of another structure" } */ +/* since the warning has been issued for out_flex_mid, no need to + issue warning again when it is included in another structure/union. */ +struct outer_flex_mid { struct out_flex_mid out_flex_data; int p; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */ +union flex_union_mid { int a; struct outer_flex_mid b; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */ + + +struct flex0 { int n; int data[0]; }; +struct out_flex_end0 { int m; struct flex0 flex_data; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */ +struct out_flex_mid0 { struct flex0 flex_data; int m; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */ +struct outer_flex_mid0 { struct out_flex_mid0 out_flex_data; int p; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */ +union flex_union_mid0 { int a; struct outer_flex_mid0 b; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */ + +struct flex1 { int n; int data[1]; }; +struct out_flex_end1 { int m; struct flex1 flex_data; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */ +struct out_flex_mid1 { struct flex1 flex_data; int m; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */ +struct outer_flex_mid1 { struct out_flex_mid1 out_flex_data; int p; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */ +union flex_union_mid1 { int a; struct outer_flex_mid1 b; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */ + +struct flexn { int n; int data[8]; }; +struct out_flex_endn { int m; struct flexn flex_data; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */ +struct out_flex_midn { struct flexn flex_data; int m; }; /* { dg-bogus"structure containing a flexible array member is not at the end of another structure" } */ +struct outer_flex_midn { struct out_flex_midn out_flex_data; int p; }; /* { dg-bogus"structure containing a flexible array member is not at the end of another structure" } */ +union flex_union_midn { int a; struct outer_flex_midn b; }; /* { dg-bogus "structure containing a flexible array member is not at the end of another structure" } */