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Fix crash emitting transparent list initializer for a large aggregate. 

llvm-svn: 334565
This commit is contained in:
Richard Smith 2018-06-13 02:06:28 +00:00
parent 92b931d519
commit 8fa638ae6f
2 changed files with 18 additions and 4 deletions
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2
clang/lib/CodeGen/CGExprAgg.cpp
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@ -1673,6 +1673,8 @@ static CharUnits GetNumNonZeroBytesInInit(const Expr *E, CodeGenFunction &CGF) {
// If this is an initlist expr, sum up the size of sizes of the (present)
// elements. If this is something weird, assume the whole thing is non-zero.
const InitListExpr *ILE = dyn_cast<InitListExpr>(E);
while (ILE && ILE->isTransparent())
ILE = dyn_cast<InitListExpr>(ILE->getInit(0));
if (!ILE || !CGF.getTypes().isZeroInitializable(ILE->getType()))
return CGF.getContext().getTypeSizeInChars(E->getType());

20
clang/test/CodeGenCXX/value-init.cpp
View File

@ -1,4 +1,5 @@
// RUN: %clang_cc1 -std=c++98 %s -triple x86_64-apple-darwin10 -emit-llvm -o - | FileCheck %s
// RUN: %clang_cc1 -std=c++98 %s -triple x86_64-apple-darwin10 -emit-llvm -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-CXX98
// RUN: %clang_cc1 -std=c++17 %s -triple x86_64-apple-darwin10 -emit-llvm -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-CXX17
struct A {
virtual ~A();
@ -114,13 +115,15 @@ void f() {
// CHECK: call void @llvm.memset.p0i8.i64
// CHECK-NOT: call void @llvm.memset.p0i8.i64
// CHECK: call void @_ZN6PR98015Test2C1Ev
// CHECK-CXX98: call void @_ZN6PR98015Test2C1Ev
// CHECK-CXX17: call void @_ZN6PR98014TestC1Ev
// CHECK-NOT: call void @_ZN6PR98015Test2C1Ev
Test2 empty2[3] = {};
// CHECK: call void @llvm.memset.p0i8.i64
// CHECK-NOT: call void @llvm.memset.p0i8.i64
// CHECK: call void @_ZN6PR98015Test3C1Ev
// CHECK-CXX98: call void @_ZN6PR98015Test3C1Ev
// CHECK-CXX17: call void @_ZN6PR98014TestC2Ev
// CHECK-NOT: call void @llvm.memset.p0i8.i64
// CHECK-NOT: call void @_ZN6PR98015Test3C1Ev
Test3 empty3[3] = {};
@ -222,7 +225,7 @@ namespace test6 {
// CHECK: [[CUR:%.*]] = phi [20 x [[A]]]* [ [[BEGIN]], {{%.*}} ], [ [[NEXT:%.*]], {{%.*}} ]
// Inner loop.
// CHECK-NEXT: [[IBEGIN:%.*]] = getelementptr inbounds [20 x [[A]]], [20 x [[A]]]* [[CUR]], i32 0, i32 0
// CHECK-NEXT: [[IBEGIN:%.*]] = getelementptr inbounds [20 x [[A]]], [20 x [[A]]]* [[CUR]], i{{32|64}} 0, i{{32|64}} 0
// CHECK-NEXT: [[IEND:%.*]] = getelementptr inbounds [[A]], [[A]]* [[IBEGIN]], i64 20
// CHECK-NEXT: br label
// CHECK: [[ICUR:%.*]] = phi [[A]]* [ [[IBEGIN]], {{%.*}} ], [ [[INEXT:%.*]], {{%.*}} ]
@ -327,3 +330,12 @@ int explicitly_defaulted() {
// CHECK: call void @llvm.memset.p0i8.i64
// CHECK-NEXT: call void @_ZN8zeroinit2X2IiEC2Ev
// CHECK-NEXT: ret void
#if __cplusplus >= 201103L
namespace transparent_init_list {
struct optional_assign_base {};
struct optional_data_dtor_base { char dummy_[24]; };
struct optional : optional_data_dtor_base, optional_assign_base {};
optional f(optional a) { return {optional(a)}; }
}
#endif