Author: rnk
Date: Fri Feb 16 11:44:47 2018
New Revision: 325375
URL: http://llvm.org/viewvc/llvm-project?rev=325375&view=rev
Log:
[MS] Make constexpr static data members implicitly inline
This handles them exactly the same way that we handle const integral
static data members with inline definitions, which is what MSVC does.
As a follow-up, now that we have a way to mark variables inline in the
AST, we should consider marking them implicitly inline there instead of
only treating them as inline in CodeGen. Unfortunately, this breaks a
lot of dllimport test cases, so that is future work for now.
Fixes PR36125.
Modified:
cfe/trunk/lib/AST/ASTContext.cpp
cfe/trunk/test/CodeGenCXX/static-data-member.cpp
Modified: cfe/trunk/lib/AST/ASTContext.cpp
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/AST/ASTContext.cpp?rev=325375&r1=325374&r2=325375&view=diff
==============================================================================
--- cfe/trunk/lib/AST/ASTContext.cpp (original)
+++ cfe/trunk/lib/AST/ASTContext.cpp Fri Feb 16 11:44:47 2018
@@ -5857,7 +5857,7 @@ CharUnits ASTContext::getObjCEncodingTyp
bool ASTContext::isMSStaticDataMemberInlineDefinition(const VarDecl *VD) const
{
return getTargetInfo().getCXXABI().isMicrosoft() &&
VD->isStaticDataMember() &&
- VD->getType()->isIntegralOrEnumerationType() &&
+ (VD->getType()->isIntegralOrEnumerationType() || VD->isConstexpr()) &&
!VD->getFirstDecl()->isOutOfLine() && VD->getFirstDecl()->hasInit();
}
Modified: cfe/trunk/test/CodeGenCXX/static-data-member.cpp
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenCXX/static-data-member.cpp?rev=325375&r1=325374&r2=325375&view=diff
==============================================================================
--- cfe/trunk/test/CodeGenCXX/static-data-member.cpp (original)
+++ cfe/trunk/test/CodeGenCXX/static-data-member.cpp Fri Feb 16 11:44:47 2018
@@ -1,6 +1,10 @@
-// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -o - %s | FileCheck %s
-// RUN: %clang_cc1 -triple x86_64-apple-darwin -emit-llvm -o - %s | \
-// RUN: FileCheck --check-prefix=MACHO %s
+// RUN: %clang_cc1 -triple x86_64-pc-linux -std=c++14 -emit-llvm -o - %s |
FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++14 -emit-llvm -o - %s \
+// RUN: | FileCheck %s --check-prefix=MACHO
+// RUN: %clang_cc1 -triple x86_64-pc-windows-msvc -std=c++14 -emit-llvm -o -
%s \
+// RUN: | FileCheck %s --check-prefix=MSVC
+// RUN: %clang_cc1 -triple x86_64-pc-windows-msvc -std=c++17 -emit-llvm -o -
%s \
+// RUN: | FileCheck %s --check-prefix=MSVC
// CHECK: @_ZN5test11A1aE = constant i32 10, align 4
// CHECK: @_ZN5test212_GLOBAL__N_11AIiE1xE = internal global i32 0, align 4
@@ -9,12 +13,25 @@
// MACHO: @_ZGVN5test31AIiE1xE = weak_odr global i64 0
// MACHO-NOT: comdat
+// MSVC: @"\01?a@A@test1@@2HB" = linkonce_odr constant i32 10, comdat, align 4
+// MSVC: @"\01?i@S@test1@@2HA" = external global i32
+// MSVC: @"\01?x@?$A@H@?A@test2@@2HA" = internal global i32 0, align 4
+
// CHECK: _ZN5test51U2k0E = global i32 0
// CHECK: _ZN5test51U2k1E = global i32 0
// CHECK: _ZN5test51U2k2E = constant i32 76
// CHECK-NOT: test51U2k3E
// CHECK-NOT: test51U2k4E
+// On Linux in C++14, neither of these are inline.
+// CHECK: @_ZN16inline_constexpr1A10just_constE = available_externally
constant i32 42
+// CHECK: @_ZN16inline_constexpr1A10const_exprE = available_externally
constant i32 43
+//
+// In MSVC, these are both implicitly inline regardless of the C++ standard
+// version.
+// MSVC: @"\01?just_const@A@inline_constexpr@@2HB" = linkonce_odr constant i32
42, comdat, align 4
+// MSVC: @"\01?const_expr@A@inline_constexpr@@2HB" = linkonce_odr constant i32
43, comdat, align 4
+
// PR5564.
namespace test1 {
struct A {
@@ -28,7 +45,7 @@ namespace test1 {
};
void f() {
- int a = S::i;
+ int a = *&A::a + S::i;
}
}
@@ -50,6 +67,11 @@ namespace test2 {
// CHECK: [[TMP:%.*]] = call i32 @_ZN5test23fooEv()
// CHECK-NEXT: store i32 [[TMP]], i32* @_ZN5test212_GLOBAL__N_11AIiE1xE,
align 4
// CHECK-NEXT: ret void
+
+ // MSVC-LABEL: define internal void @"\01??__Ex@?$A@H@?A@test2@@2HA@YAXXZ"()
+ // MSVC: [[TMP:%.*]] = call i32 @"\01?foo@test2@@YAHXZ"()
+ // MSVC-NEXT: store i32 [[TMP]], i32* @"\01?x@?$A@H@?A@test2@@2HA", align 4
+ // MSVC-NEXT: ret void
}
// Test that we don't use threadsafe statics when initializing
@@ -108,3 +130,13 @@ namespace test5 {
// CHECK: store i32 {{.*}}, i32* @_ZN5test51U2k1E
// CHECK-NOT: store {{.*}} i32* @_ZN5test51U2k2E
}
+
+// Test that MSVC mode static constexpr data members are always inline, even
pre
+// C++17.
+namespace inline_constexpr {
+struct A {
+ static const int just_const = 42;
+ static constexpr int const_expr = 43;
+};
+int useit() { return *&A::just_const + *&A::const_expr; }
+}
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