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Revert "[MS] Don't statically initialize dllimport member function pointers" 

This reverts commit r306137. It has problems on code like this:

  struct __declspec(dllimport) Foo {
    int a;
    int get_a() { return a; }
  };
  template <int (Foo::*Getter)()> struct HasValue {
    int operator()(Foo *p) { return (p->*Getter)(); }
  };
  int main() {
    Foo f;
    f.a = 3;
    int x = HasValue<&Foo::get_a>()(&f);
  }

llvm-svn: 306175
This commit is contained in:
Reid Kleckner 2017-06-23 22:39:01 +00:00
parent 53dbfb3798
commit 33d501f7d1
2 changed files with 0 additions and 74 deletions
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16
clang/lib/AST/ExprConstant.cpp
View File

@ -1665,19 +1665,6 @@ static bool CheckLValueConstantExpression(EvalInfo &Info, SourceLocation Loc,
return true;
}
/// Member pointers are constant expressions unless they point to a
/// non-virtual dllimport member function.
static bool CheckMemberPointerConstantExpression(EvalInfo &Info,
SourceLocation Loc,
QualType Type,
const APValue &Value) {
const ValueDecl *Member = Value.getMemberPointerDecl();
const auto *FD = dyn_cast_or_null<CXXMethodDecl>(Member);
if (!FD)
return true;
return FD->isVirtual() || !FD->hasAttr<DLLImportAttr>();
}
/// Check that this core constant expression is of literal type, and if not,
/// produce an appropriate diagnostic.
static bool CheckLiteralType(EvalInfo &Info, const Expr *E,
@ -1770,9 +1757,6 @@ static bool CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc,
return CheckLValueConstantExpression(Info, DiagLoc, Type, LVal);
}
if (Value.isMemberPointer())
return CheckMemberPointerConstantExpression(Info, DiagLoc, Type, Value);
// Everything else is fine.
return true;
}

58
clang/test/CodeGenCXX/dllimport-memptr-global.cpp
View File

@ -1,58 +0,0 @@
// Also check that -Wglobal-constructors does the right thing. Strictly
// speaking, this is a Sema test, but this avoids test case duplication.
// RUN: %clang_cc1 -Wglobal-constructors %s -verify -triple i686-windows-msvc -fms-extensions -std=c++11
//
// RUN: %clang_cc1 %s -emit-llvm -o - -triple i686-windows-msvc -fms-extensions -std=c++11 | FileCheck %s
struct __declspec(dllimport) Single {
void nonvirt();
virtual void virt();
};
struct A { int a; };
struct B { int b; };
struct __declspec(dllimport) Multi : A, B {
void nonvirt();
virtual void virt();
};
struct __declspec(dllimport) Virtual : virtual A {
void nonvirt();
virtual void virt();
};
struct General;
static_assert(sizeof(void (General::*)()) == 16, "force general memptr model");
struct __declspec(dllimport) General {
void nonvirt();
virtual void virt();
};
auto mp_single_nv = &Single::nonvirt; // expected-warning {{global constructor}}
auto mp_multi_nv = &Multi::nonvirt; // expected-warning {{global constructor}}
auto mp_virtual_nv = &Virtual::nonvirt; // expected-warning {{global constructor}}
auto mp_general_nv = &General::nonvirt; // expected-warning {{global constructor}}
auto mp_single_v = &Single::virt;
auto mp_multi_v = &Multi::virt;
auto mp_virtual_v = &Virtual::virt;
auto mp_general_v = &General::virt;
// All of the non-virtual globals need dynamic initializers.
// CHECK: @"\01?mp_single_nv@@3P8Single@@AEXXZQ1@" = global i8* null, align 4
// CHECK: @"\01?mp_multi_nv@@3P8Multi@@AEXXZQ1@" = global { i8*, i32 } zeroinitializer, align 4
// CHECK: @"\01?mp_virtual_nv@@3P8Virtual@@AEXXZQ1@" = global { i8*, i32, i32 } zeroinitializer, align 4
// CHECK: @"\01?mp_general_nv@@3P8General@@AEXXZQ1@" = global { i8*, i32, i32, i32 } zeroinitializer, align 4
// CHECK: @"\01?mp_single_v@@3P8Single@@AEXXZQ1@" = global i8* bitcast (void (%struct.Single*, ...)* @"\01??_9Single@@$BA@AE" to i8*), align 4
// CHECK: @"\01?mp_multi_v@@3P8Multi@@AEXXZQ1@" = global { i8*, i32 } { i8* bitcast (void (%struct.Multi*, ...)* @"\01??_9Multi@@$BA@AE" to i8*), i32 0 }, align 4
// CHECK: @"\01?mp_virtual_v@@3P8Virtual@@AEXXZQ1@" = global { i8*, i32, i32 } { i8* bitcast (void (%struct.Virtual*, ...)* @"\01??_9Virtual@@$BA@AE" to i8*), i32 0, i32 0 }, align 4
// CHECK: @"\01?mp_general_v@@3P8General@@AEXXZQ1@" = global { i8*, i32, i32, i32 } { i8* bitcast (void (%struct.General*, ...)* @"\01??_9General@@$BA@AE" to i8*), i32 0, i32 0, i32 0 }, align 4
// CHECK: define internal void @_GLOBAL__sub_I{{.*}}() {{.*}} {
// CHECK: call void @"\01??__Emp_single_nv@@YAXXZ"()
// CHECK: call void @"\01??__Emp_multi_nv@@YAXXZ"()
// CHECK: call void @"\01??__Emp_virtual_nv@@YAXXZ"()
// CHECK: call void @"\01??__Emp_general_nv@@YAXXZ"()
// CHECK: }