r247618 - C11 _Bool bitfield diagnostic
Richard Smith via cfe-commits
cfe-commits at lists.llvm.org
Mon Sep 14 23:06:12 PDT 2015
On Mon, Sep 14, 2015 at 7:07 PM, Rachel Craik <rcraik at ca.ibm.com> wrote:
> As of DR262, the C standard clarified that the width of a bit-field can
> not exceed that of the specified type, and this change was primarily to
> ensure that Clang correctly enforced this part of the standard. Looking at
> the C++11 standard again, it states that although the specified width of a
> bit-field may exceed the number of bits in the *object representation* (which
> includes padding bits) of the specified type, the extra bits will not take
> any part in the bit-field's *value representation*.
>
> Taking this into account, it seems that the correct way to validate the
> width of a bit-field (ignoring the special case of MS in C mode) would be
> to use getIntWidth in C mode, and getTypeSize in C++ mode.
>
> I would be happy create a patch to make this change tomorrow if people are
> in agreement.
>
David Majnemer has already landed a couple of changes to fix this up, so
hopefully that won't be necessary. Thanks for working on this!
> Rachel
>
>
> [image: Inactive hide details for Nico Weber ---09/14/2015 09:53:25
> PM---On Mon, Sep 14, 2015 at 5:28 PM, Richard Smith <richard at metafo]Nico
> Weber ---09/14/2015 09:53:25 PM---On Mon, Sep 14, 2015 at 5:28 PM, Richard
> Smith <richard at metafoo.co.uk> wrote:
>
> From: Nico Weber <thakis at chromium.org>
> To: Richard Smith <richard at metafoo.co.uk>
> Cc: Rachel Craik/Toronto/IBM at IBMCA, cfe-commits <
> cfe-commits at lists.llvm.org>
> Date: 09/14/2015 09:53 PM
> Subject: Re: r247618 - C11 _Bool bitfield diagnostic
> Sent by: thakis at google.com
> ------------------------------
>
>
>
> On Mon, Sep 14, 2015 at 5:28 PM, Richard Smith <*richard at metafoo.co.uk*
> <richard at metafoo.co.uk>> wrote:
>
> On Mon, Sep 14, 2015 at 5:18 PM, Nico Weber via cfe-commits <
> *cfe-commits at lists.llvm.org* <cfe-commits at lists.llvm.org>> wrote:
> This also fires for bool in C++ files, even though the commit
> message saying C11 and _Bool. Given the test changes, I suppose that's
> intentional? This fires a lot on existing code, for example protobuf:
>
> ../../third_party/protobuf/src/google/protobuf/extension_set.h:465:10:
> error: width of bit-field 'is_cleared' (4 bits) exceeds the width of its
> type; value will be truncated to 1 bit [-Werror,-Wbitfield-width]
> bool is_cleared : 4;
> ^
> ../../third_party/protobuf/src/google/protobuf/extension_set.h:472:10:
> error: width of bit-field 'is_lazy' (4 bits) exceeds the width of its type;
> value will be truncated to 1 bit [-Werror,-Wbitfield-width]
> bool is_lazy : 4;
> ^
>
> Is this expected? Is this a behavior change, or did the truncation
> happen previously and it's now just getting warned on?
>
> The code previously assumed that MSVC used the C rules here; it
> appears that's not true in all cases.
>
>
> This was on a Mac bot…
>
>
>
> Can we just remove the " || IsMsStruct
> || Context.getTargetInfo().getCXXABI().isMicrosoft()"? Is there some reason
> we need to prohibit overwide bitfields for MS bitfield layout, rather than
> just warning on them? (Does record layout fail somehow?)
> On Mon, Sep 14, 2015 at 2:27 PM, Rachel Craik via cfe-commits <
> *cfe-commits at lists.llvm.org* <cfe-commits at lists.llvm.org>> wrote:
> Author: rcraik
> Date: Mon Sep 14 16:27:36 2015
> New Revision: 247618
>
> URL: *http://llvm.org/viewvc/llvm-project?rev=247618&view=rev*
> <http://llvm.org/viewvc/llvm-project?rev=247618&view=rev>
> Log:
> C11 _Bool bitfield diagnostic
>
> Summary: Implement DR262 (for C). This patch will mainly affect
> bitfields of type _Bool
>
> Reviewers: fraggamuffin, rsmith
>
> Subscribers: hubert.reinterpretcast, cfe-commits
>
> Differential Revision: *http://reviews.llvm.org/D10018*
> <http://reviews.llvm.org/D10018>
>
> Modified:
> cfe/trunk/include/clang/Basic/DiagnosticGroups.td
> cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
> cfe/trunk/lib/Sema/SemaDecl.cpp
> cfe/trunk/test/CodeGen/bitfield-2.c
> cfe/trunk/test/CodeGenCXX/warn-padded-packed.cpp
> cfe/trunk/test/Misc/warning-flags.c
> cfe/trunk/test/Sema/bitfield.c
> cfe/trunk/test/SemaCXX/bitfield-layout.cpp
> cfe/trunk/test/SemaCXX/constant-expression-cxx11.cpp
> cfe/trunk/test/SemaCXX/constant-expression-cxx1y.cpp
> cfe/trunk/test/SemaCXX/ms_wide_bitfield.cpp
> cfe/trunk/test/SemaObjC/class-bitfield.m
>
> Modified: cfe/trunk/include/clang/Basic/DiagnosticGroups.td
> URL:
> *http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticGroups.td?rev=247618&r1=247617&r2=247618&view=diff*
> <http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticGroups.td?rev=247618&r1=247617&r2=247618&view=diff>
>
> ==============================================================================
> --- cfe/trunk/include/clang/Basic/DiagnosticGroups.td (original)
> +++ cfe/trunk/include/clang/Basic/DiagnosticGroups.td Mon Sep 14
> 16:27:36 2015
> @@ -32,6 +32,7 @@ def AutoImport : DiagGroup<"auto-import"
> def GNUBinaryLiteral : DiagGroup<"gnu-binary-literal">;
> def GNUCompoundLiteralInitializer :
> DiagGroup<"gnu-compound-literal-initializer">;
> def BitFieldConstantConversion :
> DiagGroup<"bitfield-constant-conversion">;
> +def BitFieldWidth : DiagGroup<"bitfield-width">;
> def ConstantConversion :
> DiagGroup<"constant-conversion", [ BitFieldConstantConversion
> ] >;
> def LiteralConversion : DiagGroup<"literal-conversion">;
>
> Modified: cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
> URL:
> *http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td?rev=247618&r1=247617&r2=247618&view=diff*
> <http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td?rev=247618&r1=247617&r2=247618&view=diff>
>
> ==============================================================================
> --- cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
> (original)
> +++ cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td Mon Sep
> 14 16:27:36 2015
> @@ -4314,20 +4314,21 @@ def err_bitfield_has_negative_width : Er
> def err_anon_bitfield_has_negative_width : Error<
> "anonymous bit-field has negative width (%0)">;
> def err_bitfield_has_zero_width : Error<"named bit-field %0 has
> zero width">;
> -def err_bitfield_width_exceeds_type_size : Error<
> - "size of bit-field %0 (%1 bits) exceeds size of its type (%2
> bits)">;
> -def err_anon_bitfield_width_exceeds_type_size : Error<
> - "size of anonymous bit-field (%0 bits) exceeds size of its
> type (%1 bits)">;
> +def err_bitfield_width_exceeds_type_width : Error<
> + "width of bit-field %0 (%1 bits) exceeds width of its type
> (%2 bit%s2)">;
> +def err_anon_bitfield_width_exceeds_type_width : Error<
> + "width of anonymous bit-field (%0 bits) exceeds width of its
> type "
> + "(%1 bit%s1)">;
> def err_incorrect_number_of_vector_initializers : Error<
> "number of elements must be either one or match the size of
> the vector">;
>
> // Used by C++ which allows bit-fields that are wider than the
> type.
> -def warn_bitfield_width_exceeds_type_size: Warning<
> - "size of bit-field %0 (%1 bits) exceeds the size of its type;
> value will be "
> - "truncated to %2 bits">;
> -def warn_anon_bitfield_width_exceeds_type_size : Warning<
> - "size of anonymous bit-field (%0 bits) exceeds size of its
> type; value will "
> - "be truncated to %1 bits">;
> +def warn_bitfield_width_exceeds_type_width: Warning<
> + "width of bit-field %0 (%1 bits) exceeds the width of its
> type; value will "
> + "be truncated to %2 bit%s2">, InGroup<BitFieldWidth>;
> +def warn_anon_bitfield_width_exceeds_type_width : Warning<
> + "width of anonymous bit-field (%0 bits) exceeds width of its
> type; value "
> + "will be truncated to %1 bit%s1">, InGroup<BitFieldWidth>;
>
> def warn_missing_braces : Warning<
> "suggest braces around initialization of subobject">,
>
> Modified: cfe/trunk/lib/Sema/SemaDecl.cpp
> URL:
> *http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaDecl.cpp?rev=247618&r1=247617&r2=247618&view=diff*
> <http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaDecl.cpp?rev=247618&r1=247617&r2=247618&view=diff>
>
> ==============================================================================
> --- cfe/trunk/lib/Sema/SemaDecl.cpp (original)
> +++ cfe/trunk/lib/Sema/SemaDecl.cpp Mon Sep 14 16:27:36 2015
> @@ -12625,26 +12625,26 @@ ExprResult
> Sema::VerifyBitField(SourceLo
> }
>
> if (!FieldTy->isDependentType()) {
> - uint64_t TypeSize = Context.getTypeSize(FieldTy);
> - if (Value.getZExtValue() > TypeSize) {
> + uint64_t TypeWidth = Context.getIntWidth(FieldTy);
> + if (Value.ugt(TypeWidth)) {
> if (!getLangOpts().CPlusPlus || IsMsStruct ||
> Context.getTargetInfo().getCXXABI().isMicrosoft()) {
> if (FieldName)
> - return Diag(FieldLoc,
> diag::err_bitfield_width_exceeds_type_size)
> + return Diag(FieldLoc,
> diag::err_bitfield_width_exceeds_type_width)
> << FieldName << (unsigned)Value.getZExtValue()
> - << (unsigned)TypeSize;
> + << (unsigned)TypeWidth;
>
> - return Diag(FieldLoc,
> diag::err_anon_bitfield_width_exceeds_type_size)
> - << (unsigned)Value.getZExtValue() <<
> (unsigned)TypeSize;
> + return Diag(FieldLoc,
> diag::err_anon_bitfield_width_exceeds_type_width)
> + << (unsigned)Value.getZExtValue() <<
> (unsigned)TypeWidth;
> }
>
> if (FieldName)
> - Diag(FieldLoc,
> diag::warn_bitfield_width_exceeds_type_size)
> + Diag(FieldLoc,
> diag::warn_bitfield_width_exceeds_type_width)
> << FieldName << (unsigned)Value.getZExtValue()
> - << (unsigned)TypeSize;
> + << (unsigned)TypeWidth;
> else
> - Diag(FieldLoc,
> diag::warn_anon_bitfield_width_exceeds_type_size)
> - << (unsigned)Value.getZExtValue() <<
> (unsigned)TypeSize;
> + Diag(FieldLoc,
> diag::warn_anon_bitfield_width_exceeds_type_width)
> + << (unsigned)Value.getZExtValue() <<
> (unsigned)TypeWidth;
> }
> }
>
>
> Modified: cfe/trunk/test/CodeGen/bitfield-2.c
> URL:
> *http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/bitfield-2.c?rev=247618&r1=247617&r2=247618&view=diff*
> <http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/bitfield-2.c?rev=247618&r1=247617&r2=247618&view=diff>
>
> ==============================================================================
> --- cfe/trunk/test/CodeGen/bitfield-2.c (original)
> +++ cfe/trunk/test/CodeGen/bitfield-2.c Mon Sep 14 16:27:36 2015
> @@ -237,7 +237,7 @@ unsigned long long test_5() {
> /***/
>
> struct s6 {
> - _Bool f0 : 2;
> + unsigned f0 : 2;
> };
>
> struct s6 g6 = { 0xF };
>
> Modified: cfe/trunk/test/CodeGenCXX/warn-padded-packed.cpp
> URL:
> *http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenCXX/warn-padded-packed.cpp?rev=247618&r1=247617&r2=247618&view=diff*
> <http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenCXX/warn-padded-packed.cpp?rev=247618&r1=247617&r2=247618&view=diff>
>
> ==============================================================================
> --- cfe/trunk/test/CodeGenCXX/warn-padded-packed.cpp (original)
> +++ cfe/trunk/test/CodeGenCXX/warn-padded-packed.cpp Mon Sep 14
> 16:27:36 2015
> @@ -69,7 +69,7 @@ struct S12 {
>
> struct S13 { // expected-warning {{padding size of 'S13' with 6
> bits to alignment boundary}}
> char c;
> - bool b : 10; // expected-warning {{size of bit-field 'b' (10
> bits) exceeds the size of its type}}
> + bool b : 10; // expected-warning {{width of bit-field 'b' (10
> bits) exceeds the width of its type}}
> };
>
> // The warnings are emitted when the layout of the structs is
> computed, so we have to use them.
>
> Modified: cfe/trunk/test/Misc/warning-flags.c
> URL:
> *http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Misc/warning-flags.c?rev=247618&r1=247617&r2=247618&view=diff*
> <http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Misc/warning-flags.c?rev=247618&r1=247617&r2=247618&view=diff>
>
> ==============================================================================
> --- cfe/trunk/test/Misc/warning-flags.c (original)
> +++ cfe/trunk/test/Misc/warning-flags.c Mon Sep 14 16:27:36 2015
> @@ -18,7 +18,7 @@ This test serves two purposes:
>
> The list of warnings below should NEVER grow. It should
> gradually shrink to 0.
>
> -CHECK: Warnings without flags (92):
> +CHECK: Warnings without flags (90):
> CHECK-NEXT: ext_excess_initializers
> CHECK-NEXT: ext_excess_initializers_in_char_array_initializer
> CHECK-NEXT: ext_expected_semi_decl_list
> @@ -44,10 +44,8 @@ CHECK-NEXT: pp_pragma_once_in_main_fil
> CHECK-NEXT: pp_pragma_sysheader_in_main_file
> CHECK-NEXT: w_asm_qualifier_ignored
> CHECK-NEXT: warn_accessor_property_type_mismatch
> -CHECK-NEXT: warn_anon_bitfield_width_exceeds_type_size
> CHECK-NEXT: warn_arcmt_nsalloc_realloc
> CHECK-NEXT: warn_asm_label_on_auto_decl
> -CHECK-NEXT: warn_bitfield_width_exceeds_type_size
> CHECK-NEXT: warn_c_kext
> CHECK-NEXT:
> warn_call_to_pure_virtual_member_function_from_ctor_dtor
> CHECK-NEXT: warn_call_wrong_number_of_arguments
>
> Modified: cfe/trunk/test/Sema/bitfield.c
> URL:
> *http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Sema/bitfield.c?rev=247618&r1=247617&r2=247618&view=diff*
> <http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Sema/bitfield.c?rev=247618&r1=247617&r2=247618&view=diff>
>
> ==============================================================================
> --- cfe/trunk/test/Sema/bitfield.c (original)
> +++ cfe/trunk/test/Sema/bitfield.c Mon Sep 14 16:27:36 2015
> @@ -6,7 +6,7 @@ struct a {
> int a : -1; // expected-error{{bit-field 'a' has negative
> width}}
>
> // rdar://6081627
> - int b : 33; // expected-error{{size of bit-field 'b' (33
> bits) exceeds size of its type (32 bits)}}
> + int b : 33; // expected-error{{width of bit-field 'b' (33
> bits) exceeds width of its type (32 bits)}}
>
> int c : (1 + 0.25); // expected-error{{expression is not an
> integer constant expression}}
> int d : (int)(1 + 0.25);
> @@ -22,9 +22,12 @@ struct a {
> int g : (_Bool)1;
>
> // PR4017
> - char : 10; // expected-error {{size of anonymous
> bit-field (10 bits) exceeds size of its type (8 bits)}}
> + char : 10; // expected-error {{width of anonymous
> bit-field (10 bits) exceeds width of its type (8 bits)}}
> unsigned : -2; // expected-error {{anonymous bit-field has
> negative width (-2)}}
> float : 12; // expected-error {{anonymous bit-field has
> non-integral type 'float'}}
> +
> + _Bool : 2; // expected-error {{width of anonymous bit-field
> (2 bits) exceeds width of its type (1 bit)}}
> + _Bool h : 5; // expected-error {{width of bit-field 'h' (5
> bits) exceeds width of its type (1 bit)}}
> };
>
> struct b {unsigned x : 2;} x;
>
> Modified: cfe/trunk/test/SemaCXX/bitfield-layout.cpp
> URL:
> *http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/bitfield-layout.cpp?rev=247618&r1=247617&r2=247618&view=diff*
> <http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/bitfield-layout.cpp?rev=247618&r1=247617&r2=247618&view=diff>
>
> ==============================================================================
> --- cfe/trunk/test/SemaCXX/bitfield-layout.cpp (original)
> +++ cfe/trunk/test/SemaCXX/bitfield-layout.cpp Mon Sep 14
> 16:27:36 2015
> @@ -5,25 +5,25 @@
>
> // Simple tests.
> struct Test1 {
> - char c : 9; // expected-warning {{size of bit-field 'c' (9
> bits) exceeds the size of its type; value will be truncated to 8 bits}}
> + char c : 9; // expected-warning {{width of bit-field 'c' (9
> bits) exceeds the width of its type; value will be truncated to 8 bits}}
> };
> CHECK_SIZE(Test1, 2);
> CHECK_ALIGN(Test1, 1);
>
> struct Test2 {
> - char c : 16; // expected-warning {{size of bit-field 'c' (16
> bits) exceeds the size of its type; value will be truncated to 8 bits}}
> + char c : 16; // expected-warning {{width of bit-field 'c' (16
> bits) exceeds the width of its type; value will be truncated to 8 bits}}
> };
> CHECK_SIZE(Test2, 2);
> CHECK_ALIGN(Test2, 2);
>
> struct Test3 {
> - char c : 32; // expected-warning {{size of bit-field 'c' (32
> bits) exceeds the size of its type; value will be truncated to 8 bits}}
> + char c : 32; // expected-warning {{width of bit-field 'c' (32
> bits) exceeds the width of its type; value will be truncated to 8 bits}}
> };
> CHECK_SIZE(Test3, 4);
> CHECK_ALIGN(Test3, 4);
>
> struct Test4 {
> - char c : 64; // expected-warning {{size of bit-field 'c' (64
> bits) exceeds the size of its type; value will be truncated to 8 bits}}
> + char c : 64; // expected-warning {{width of bit-field 'c' (64
> bits) exceeds the width of its type; value will be truncated to 8 bits}}
> };
> CHECK_SIZE(Test4, 8);
> CHECK_ALIGN(Test4, 8);
>
> Modified: cfe/trunk/test/SemaCXX/constant-expression-cxx11.cpp
> URL:
> *http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/constant-expression-cxx11.cpp?rev=247618&r1=247617&r2=247618&view=diff*
> <http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/constant-expression-cxx11.cpp?rev=247618&r1=247617&r2=247618&view=diff>
>
> ==============================================================================
> --- cfe/trunk/test/SemaCXX/constant-expression-cxx11.cpp
> (original)
> +++ cfe/trunk/test/SemaCXX/constant-expression-cxx11.cpp Mon Sep
> 14 16:27:36 2015
> @@ -1801,9 +1801,9 @@ namespace Bitfields {
> bool b : 1;
> unsigned u : 5;
> int n : 5;
> - bool b2 : 3;
> - unsigned u2 : 74; // expected-warning {{exceeds the size of
> its type}}
> - int n2 : 81; // expected-warning {{exceeds the size of its
> type}}
> + bool b2 : 3; // expected-warning {{exceeds the width of its
> type}}
> + unsigned u2 : 74; // expected-warning {{exceeds the width
> of its type}}
> + int n2 : 81; // expected-warning {{exceeds the width of its
> type}}
> };
>
> constexpr A a = { false, 33, 31, false, 0xffffffff,
> 0x7fffffff }; // expected-warning 2{{truncation}}
>
> Modified: cfe/trunk/test/SemaCXX/constant-expression-cxx1y.cpp
> URL:
> *http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/constant-expression-cxx1y.cpp?rev=247618&r1=247617&r2=247618&view=diff*
> <http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/constant-expression-cxx1y.cpp?rev=247618&r1=247617&r2=247618&view=diff>
>
> ==============================================================================
> --- cfe/trunk/test/SemaCXX/constant-expression-cxx1y.cpp
> (original)
> +++ cfe/trunk/test/SemaCXX/constant-expression-cxx1y.cpp Mon Sep
> 14 16:27:36 2015
> @@ -872,7 +872,7 @@ namespace Lifetime {
>
> namespace Bitfields {
> struct A {
> - bool b : 3;
> + bool b : 1;
> int n : 4;
> unsigned u : 5;
> };
>
> Modified: cfe/trunk/test/SemaCXX/ms_wide_bitfield.cpp
> URL:
> *http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/ms_wide_bitfield.cpp?rev=247618&r1=247617&r2=247618&view=diff*
> <http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/ms_wide_bitfield.cpp?rev=247618&r1=247617&r2=247618&view=diff>
>
> ==============================================================================
> --- cfe/trunk/test/SemaCXX/ms_wide_bitfield.cpp (original)
> +++ cfe/trunk/test/SemaCXX/ms_wide_bitfield.cpp Mon Sep 14
> 16:27:36 2015
> @@ -1,9 +1,10 @@
> // RUN: %clang_cc1 -fno-rtti -emit-llvm-only -triple
> i686-pc-win32 -fdump-record-layouts -fsyntax-only -mms-bitfields -verify %s
> 2>&1
>
> struct A {
> - char a : 9; // expected-error{{size of bit-field 'a' (9 bits)
> exceeds size of its type (8 bits)}}
> - int b : 33; // expected-error{{size of bit-field 'b' (33
> bits) exceeds size of its type (32 bits)}}
> - bool c : 9; // expected-error{{size of bit-field 'c' (9 bits)
> exceeds size of its type (8 bits)}}
> + char a : 9; // expected-error{{width of bit-field 'a' (9
> bits) exceeds width of its type (8 bits)}}
> + int b : 33; // expected-error{{width of bit-field 'b' (33
> bits) exceeds width of its type (32 bits)}}
> + bool c : 9; // expected-error{{width of bit-field 'c' (9
> bits) exceeds width of its type (1 bit)}}
> + bool d : 3; // expected-error{{width of bit-field 'd' (3
> bits) exceeds width of its type (1 bit)}}
> };
>
> int a[sizeof(A) == 1 ? 1 : -1];
>
> Modified: cfe/trunk/test/SemaObjC/class-bitfield.m
> URL:
> *http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaObjC/class-bitfield.m?rev=247618&r1=247617&r2=247618&view=diff*
> <http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaObjC/class-bitfield.m?rev=247618&r1=247617&r2=247618&view=diff>
>
> ==============================================================================
> --- cfe/trunk/test/SemaObjC/class-bitfield.m (original)
> +++ cfe/trunk/test/SemaObjC/class-bitfield.m Mon Sep 14 16:27:36
> 2015
> @@ -5,7 +5,7 @@
> int a : -1; // expected-error{{bit-field 'a' has negative
> width}}
>
> // rdar://6081627
> - int b : 33; // expected-error{{size of bit-field 'b' (33
> bits) exceeds size of its type (32 bits)}}
> + int b : 33; // expected-error{{width of bit-field 'b' (33
> bits) exceeds width of its type (32 bits)}}
>
> int c : (1 + 0.25); // expected-error{{expression is not an
> integer constant expression}}
> int d : (int)(1 + 0.25);
>
>
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