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96 lines
3.3 KiB
96 lines
3.3 KiB
4 months ago
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// RUN: %clang_cc1 -std=c++2a %s -emit-llvm -o - -triple x86_64-linux-gnu | FileCheck %s
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// RUN: %clang_cc1 -std=c++2a %s -emit-llvm -o - -triple x86_64-linux-gnu -O2 -disable-llvm-passes | FileCheck %s --check-prefix=CHECK-OPT
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struct A { ~A(); int n; char c[3]; };
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struct B { [[no_unique_address]] A a; char k; };
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// CHECK-DAG: @b = global { i32, [3 x i8], i8 } { i32 1, [3 x i8] c"\02\03\04", i8 5 }
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B b = {1, 2, 3, 4, 5};
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struct C : A {};
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struct D : C {};
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struct E { int e; [[no_unique_address]] D d; char k; };
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// CHECK-DAG: @e = global { i32, i32, [3 x i8], i8 } { i32 1, i32 2, [3 x i8] c"\03\04\05", i8 6 }
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E e = {1, 2, 3, 4, 5, 6};
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struct Empty1 {};
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struct Empty2 {};
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struct Empty3 {};
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struct HasEmpty {
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[[no_unique_address]] Empty1 e1;
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int a;
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[[no_unique_address]] Empty2 e2;
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int b;
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[[no_unique_address]] Empty3 e3;
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};
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// CHECK-DAG: @he = global %{{[^ ]*}} { i32 1, i32 2 }
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HasEmpty he = {{}, 1, {}, 2, {}};
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struct HasEmptyDuplicates {
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[[no_unique_address]] Empty1 e1; // +0
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int a;
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[[no_unique_address]] Empty1 e2; // +4
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int b;
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[[no_unique_address]] Empty1 e3; // +8
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};
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// CHECK-DAG: @off1 = global i64 0
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Empty1 HasEmptyDuplicates::*off1 = &HasEmptyDuplicates::e1;
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// CHECK-DAG: @off2 = global i64 4
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Empty1 HasEmptyDuplicates::*off2 = &HasEmptyDuplicates::e2;
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// CHECK-DAG: @off3 = global i64 8
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Empty1 HasEmptyDuplicates::*off3 = &HasEmptyDuplicates::e3;
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// CHECK-DAG: @hed = global %{{[^ ]*}} { i32 1, i32 2, [4 x i8] undef }
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HasEmptyDuplicates hed = {{}, 1, {}, 2, {}};
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struct __attribute__((packed, aligned(2))) PackedAndPadded {
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~PackedAndPadded();
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char c;
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int n;
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};
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struct WithPackedAndPadded {
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[[no_unique_address]] PackedAndPadded pap;
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char d;
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};
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// CHECK-DAG: @wpap = global <{ i8, i32, i8 }> <{ i8 1, i32 2, i8 3 }>
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WithPackedAndPadded wpap = {1, 2, 3};
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struct FieldOverlap {
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[[no_unique_address]] Empty1 e1, e2, e3, e4;
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int n;
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};
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static_assert(sizeof(FieldOverlap) == 4);
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// CHECK-DAG: @fo = global %{{[^ ]*}} { i32 1234 }
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FieldOverlap fo = {{}, {}, {}, {}, 1234};
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// CHECK-DAG: @e1 = constant %[[E1:[^ ]*]]* bitcast (%[[FO:[^ ]*]]* @fo to %[[E1]]*)
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Empty1 &e1 = fo.e1;
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// CHECK-DAG: @e2 = constant %[[E1]]* bitcast (i8* getelementptr (i8, i8* bitcast (%[[FO]]* @fo to i8*), i64 1) to %[[E1]]*)
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Empty1 &e2 = fo.e2;
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// CHECK-LABEL: accessE1
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// CHECK: %[[RET:.*]] = bitcast %[[FO]]* %{{.*}} to %[[E1]]*
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// CHECK: ret %[[E1]]* %[[RET]]
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Empty1 &accessE1(FieldOverlap &fo) { return fo.e1; }
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// CHECK-LABEL: accessE2
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// CHECK: %[[AS_I8:.*]] = bitcast %[[FO]]* %{{.*}} to i8*
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// CHECK: %[[ADJUSTED:.*]] = getelementptr inbounds i8, i8* %[[AS_I8]], i64 1
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// CHECK: %[[RET:.*]] = bitcast i8* %[[ADJUSTED]] to %[[E1]]*
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// CHECK: ret %[[E1]]* %[[RET]]
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Empty1 &accessE2(FieldOverlap &fo) { return fo.e2; }
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struct LaterDeclaredFieldHasLowerOffset {
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int a;
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int b;
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[[no_unique_address]] Empty1 e;
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};
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// CHECK-OPT-LABEL: @_Z41loadWhereLaterDeclaredFieldHasLowerOffset
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int loadWhereLaterDeclaredFieldHasLowerOffset(LaterDeclaredFieldHasLowerOffset &a) {
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// CHECK-OPT: getelementptr
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// CHECK-OPT: load {{.*}}, !tbaa ![[TBAA_AB:[0-9]*]]
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return a.b;
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}
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// Note, never emit TBAA for zero-size fields.
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// CHECK-OPT: ![[TBAA_AB]] = !{![[TBAA_A:[0-9]*]], ![[TBAA_INT:[0-9]*]], i64 4}
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// CHECK-OPT: ![[TBAA_A]] = !{!"_ZTS32LaterDeclaredFieldHasLowerOffset", ![[TBAA_INT]], i64 0, ![[TBAA_INT]], i64 4}
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