stevewan updated this revision to Diff 367833.
stevewan added a comment.
Address comments about the check
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D107394/new/
https://reviews.llvm.org/D107394
Files:
clang/lib/AST/RecordLayoutBuilder.cpp
clang/test/Layout/aix-alignof-align-and-pack-attr.cpp
clang/test/Layout/aix-type-align-and-pack-attr.cpp
Index: clang/test/Layout/aix-type-align-and-pack-attr.cpp
===================================================================
--- /dev/null
+++ clang/test/Layout/aix-type-align-and-pack-attr.cpp
@@ -0,0 +1,59 @@
+// RUN: %clang_cc1 -triple powerpc-ibm-aix-xcoff -S -emit-llvm -x c++ < %s | \
+// RUN: FileCheck %s
+
+// RUN: %clang_cc1 -triple powerpc64-ibm-aix-xcoff -S -emit-llvm -x c++ < %s | \
+// RUN: FileCheck %s
+
+namespace test1 {
+struct __attribute__((__aligned__(2))) S {
+ double d;
+};
+
+S s;
+
+// CHECK: @{{.*}}test1{{.*}}s{{.*}} = global %"struct.test1::S" zeroinitializer, align 8
+} // namespace test1
+
+namespace test2 {
+struct __attribute__((__aligned__(2), packed)) S {
+ double d;
+};
+
+S s;
+
+// CHECK: @{{.*}}test2{{.*}}s{{.*}} = global %"struct.test2::S" zeroinitializer, align 2
+} // namespace test2
+
+namespace test3 {
+struct __attribute__((__aligned__(16))) S {
+ double d;
+};
+
+S s;
+
+// CHECK: @{{.*}}test3{{.*}}s{{.*}} = global %"struct.test3::S" zeroinitializer, align 16
+} // namespace test3
+
+namespace test4 {
+struct __attribute__((aligned(2))) SS {
+ double d;
+};
+
+struct S {
+ struct SS ss;
+} s;
+
+// CHECK: @{{.*}}test4{{.*}}s{{.*}} = global %"struct.test4::S" zeroinitializer, align 8
+} // namespace test4
+
+namespace test5 {
+struct __attribute__((aligned(2), packed)) SS {
+ double d;
+};
+
+struct S {
+ struct SS ss;
+} s;
+
+// CHECK: @{{.*}}test5{{.*}}s{{.*}} = global %"struct.test5::S" zeroinitializer, align 2
+} // namespace test5
Index: clang/test/Layout/aix-alignof-align-and-pack-attr.cpp
===================================================================
--- clang/test/Layout/aix-alignof-align-and-pack-attr.cpp
+++ /dev/null
@@ -1,29 +0,0 @@
-// RUN: %clang_cc1 -triple powerpc-ibm-aix-xcoff -S -emit-llvm -x c++ < %s | \
-// RUN: FileCheck %s
-
-// RUN: %clang_cc1 -triple powerpc64-ibm-aix-xcoff -S -emit-llvm -x c++ < %s | \
-// RUN: FileCheck %s
-
-namespace test1 {
-struct __attribute__((__aligned__(2))) C {
- double x;
-} c;
-
-// CHECK: @{{.*}}test1{{.*}}c{{.*}} = global %"struct.test1::C" zeroinitializer, align 8
-} // namespace test1
-
-namespace test2 {
-struct __attribute__((__aligned__(2), packed)) C {
- double x;
-} c;
-
-// CHECK: @{{.*}}test2{{.*}}c{{.*}} = global %"struct.test2::C" zeroinitializer, align 2
-} // namespace test2
-
-namespace test3 {
-struct __attribute__((__aligned__(16))) C {
- double x;
-} c;
-
-// CHECK: @{{.*}}test3{{.*}}c{{.*}} = global %"struct.test3::C" zeroinitializer, align 16
-} // namespace test3
Index: clang/lib/AST/RecordLayoutBuilder.cpp
===================================================================
--- clang/lib/AST/RecordLayoutBuilder.cpp
+++ clang/lib/AST/RecordLayoutBuilder.cpp
@@ -1978,7 +1978,7 @@
// and zero-width bit-fields count as prior members; members of empty class
// types marked `no_unique_address` are not considered to be prior members.
CharUnits PreferredAlign = FieldAlign;
- if (DefaultsToAIXPowerAlignment && !AlignIsRequired &&
+ if (DefaultsToAIXPowerAlignment &&
(FoundFirstNonOverlappingEmptyFieldForAIX || IsNaturalAlign)) {
auto performBuiltinTypeAlignmentUpgrade = [&](const BuiltinType *BTy) {
if (BTy->getKind() == BuiltinType::Double ||
@@ -1989,16 +1989,25 @@
}
};
- const Type *Ty = D->getType()->getBaseElementTypeUnsafe();
- if (const ComplexType *CTy = Ty->getAs<ComplexType>()) {
- performBuiltinTypeAlignmentUpgrade(CTy->getElementType()->castAs<BuiltinType>());
- } else if (const BuiltinType *BTy = Ty->getAs<BuiltinType>()) {
- performBuiltinTypeAlignmentUpgrade(BTy);
- } else if (const RecordType *RT = Ty->getAs<RecordType>()) {
- const RecordDecl *RD = RT->getDecl();
- assert(RD && "Expected non-null RecordDecl.");
- const ASTRecordLayout &FieldRecord = Context.getASTRecordLayout(RD);
- PreferredAlign = FieldRecord.getPreferredAlignment();
+ const Type *Ty = D->getType().getTypePtr();
+ const Type *BaseTy = Ty->getBaseElementTypeUnsafe();
+ // When used as part of a typedef, or together with a 'packed' attribute,
+ // the 'aligned' attribute can be used to decrease alignment. In that case,
+ // it overrides any computed alignment we have, and there is no need to
+ // upgrade the alignment.
+ if (!AlignIsRequired ||
+ Ty->getTypeClass() != Type::Typedef && !FieldPacked) {
+ if (const ComplexType *CTy = BaseTy->getAs<ComplexType>()) {
+ performBuiltinTypeAlignmentUpgrade(
+ CTy->getElementType()->castAs<BuiltinType>());
+ } else if (const BuiltinType *BTy = BaseTy->getAs<BuiltinType>()) {
+ performBuiltinTypeAlignmentUpgrade(BTy);
+ } else if (const RecordType *RT = BaseTy->getAs<RecordType>()) {
+ const RecordDecl *RD = RT->getDecl();
+ assert(RD && "Expected non-null RecordDecl.");
+ const ASTRecordLayout &FieldRecord = Context.getASTRecordLayout(RD);
+ PreferredAlign = FieldRecord.getPreferredAlignment();
+ }
}
}
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