PR26547: alignof should return ABI alignment, not preferred alignment
Summary:
- Add `UETT_PreferredAlignOf` to account for the difference between `__alignof` and `alignof`
- `AlignOfType` now returns ABI alignment instead of preferred alignment iff clang-abi-compat > 7, and one uses _Alignof or alignof
Patch by Nicole Mazzuca!
Differential Revision: https://reviews.llvm.org/D53207
llvm-svn: 345419
diff --git a/clang/test/SemaCXX/align-x86-abi7.cpp b/clang/test/SemaCXX/align-x86-abi7.cpp
new file mode 100644
index 0000000..3088a13
--- /dev/null
+++ b/clang/test/SemaCXX/align-x86-abi7.cpp
@@ -0,0 +1,25 @@
+// RUN: %clang_cc1 -std=c++11 -triple i386-apple-darwin9 -fsyntax-only -verify -fclang-abi-compat=7 %s
+// expected-no-diagnostics
+
+using size_t = decltype(sizeof(0));
+
+template <typename T, size_t Preferred>
+struct check_alignment {
+ using type = T;
+ static type value;
+
+ static_assert(__alignof__(value) == Preferred, "__alignof__(value) != Preferred");
+ static_assert(__alignof__(type) == Preferred, "__alignof__(type) != Preferred");
+ static_assert(alignof(type) == Preferred, "alignof(type) != Preferred");
+};
+
+// PR3433
+template struct check_alignment<double, 8>;
+template struct check_alignment<long long, 8>;
+template struct check_alignment<unsigned long long, 8>;
+
+// PR6362
+template struct check_alignment<double[3], 8>;
+
+enum big_enum { x = 18446744073709551615ULL };
+template struct check_alignment<big_enum, 8>;
diff --git a/clang/test/SemaCXX/align-x86.cpp b/clang/test/SemaCXX/align-x86.cpp
new file mode 100644
index 0000000..0c97fc2
--- /dev/null
+++ b/clang/test/SemaCXX/align-x86.cpp
@@ -0,0 +1,62 @@
+// RUN: %clang_cc1 -std=c++11 -triple i386-apple-darwin9 -fsyntax-only -verify %s
+// expected-no-diagnostics
+
+using size_t = decltype(sizeof(0));
+
+struct complex_double {
+ double real;
+ double imag;
+};
+
+template <typename T, size_t ABI, size_t Preferred>
+struct check_alignment {
+ using type = T;
+ static type value;
+
+ static_assert(__alignof__(value) == Preferred, "__alignof__(value) != Preferred");
+ static_assert(__alignof__(type) == Preferred, "__alignof__(type) != Preferred");
+ static_assert(alignof(type) == ABI, "alignof(type) != ABI");
+};
+
+// PR3433
+template struct check_alignment<double, 4, 8>;
+template struct check_alignment<long long, 4, 8>;
+template struct check_alignment<unsigned long long, 4, 8>;
+template struct check_alignment<complex_double, 4, 4>;
+
+// PR6362
+struct __attribute__((packed))
+packed_struct {
+ unsigned int a;
+} g_packedstruct;
+template struct check_alignment<packed_struct, 1, 1>;
+static_assert(__alignof__(g_packedstruct.a) == 1, "__alignof__(packed_struct.member) != 1");
+
+template struct check_alignment<double[3], 4, 8>;
+
+enum big_enum { x = 18446744073709551615ULL };
+template struct check_alignment<big_enum, 4, 8>;
+
+// PR5637
+
+#define ALIGNED(x) __attribute__((aligned(x)))
+
+typedef ALIGNED(2) struct {
+ char a[3];
+} aligned_before_struct;
+
+static_assert(sizeof(aligned_before_struct) == 3, "");
+static_assert(sizeof(aligned_before_struct[1]) == 4, "");
+static_assert(sizeof(aligned_before_struct[2]) == 6, "");
+static_assert(sizeof(aligned_before_struct[2][1]) == 8, "");
+static_assert(sizeof(aligned_before_struct[1][2]) == 6, "");
+
+typedef struct ALIGNED(2) {
+ char a[3];
+} aligned_after_struct;
+
+static_assert(sizeof(aligned_after_struct) == 4, "");
+static_assert(sizeof(aligned_after_struct[1]) == 4, "");
+static_assert(sizeof(aligned_after_struct[2]) == 8, "");
+static_assert(sizeof(aligned_after_struct[2][1]) == 8, "");
+static_assert(sizeof(aligned_after_struct[1][2]) == 8, "");
diff --git a/clang/test/SemaCXX/alignof.cpp b/clang/test/SemaCXX/alignof.cpp
index e3690ea..90526c0 100644
--- a/clang/test/SemaCXX/alignof.cpp
+++ b/clang/test/SemaCXX/alignof.cpp
@@ -4,14 +4,14 @@
struct S0 {
int x;
- static const int test0 = __alignof__(x); // expected-error {{invalid application of 'alignof' to a field of a class still being defined}}
- static const int test1 = __alignof__(S0::x); // expected-error {{invalid application of 'alignof' to a field of a class still being defined}}
- auto test2() -> char(&)[__alignof__(x)]; // expected-error {{invalid application of 'alignof' to a field of a class still being defined}}
+ static const int test0 = __alignof__(x); // expected-error {{invalid application of '__alignof' to a field of a class still being defined}}
+ static const int test1 = __alignof__(S0::x); // expected-error {{invalid application of '__alignof' to a field of a class still being defined}}
+ auto test2() -> char(&)[__alignof__(x)]; // expected-error {{invalid application of '__alignof' to a field of a class still being defined}}
};
struct S1; // expected-note 6 {{forward declaration}}
extern S1 s1;
-const int test3 = __alignof__(s1); // expected-error {{invalid application of 'alignof' to an incomplete type 'S1'}}
+const int test3 = __alignof__(s1); // expected-error {{invalid application of '__alignof' to an incomplete type 'S1'}}
struct S2 {
S2();
@@ -19,11 +19,11 @@
int x;
int test4 = __alignof__(x); // ok
- int test5 = __alignof__(s); // expected-error {{invalid application of 'alignof' to an incomplete type 'S1'}}
+ int test5 = __alignof__(s); // expected-error {{invalid application of '__alignof' to an incomplete type 'S1'}}
};
const int test6 = __alignof__(S2::x);
-const int test7 = __alignof__(S2::s); // expected-error {{invalid application of 'alignof' to an incomplete type 'S1'}}
+const int test7 = __alignof__(S2::s); // expected-error {{invalid application of '__alignof' to an incomplete type 'S1'}}
// Arguably, these should fail like the S1 cases do: the alignment of
// 's2.x' should depend on the alignment of both x-within-S2 and
@@ -34,10 +34,10 @@
S2 s2;
static const int test8 = __alignof__(s2.x);
- static const int test9 = __alignof__(s2.s); // expected-error {{invalid application of 'alignof' to an incomplete type 'S1'}}
+ static const int test9 = __alignof__(s2.s); // expected-error {{invalid application of '__alignof' to an incomplete type 'S1'}}
auto test10() -> char(&)[__alignof__(s2.x)];
static const int test11 = __alignof__(S3::s2.x);
- static const int test12 = __alignof__(S3::s2.s); // expected-error {{invalid application of 'alignof' to an incomplete type 'S1'}}
+ static const int test12 = __alignof__(S3::s2.s); // expected-error {{invalid application of '__alignof' to an incomplete type 'S1'}}
auto test13() -> char(&)[__alignof__(s2.x)];
};
@@ -59,9 +59,9 @@
};
const int test8 = __alignof__(S5::x);
-long long int test14[2];
+int test14[2];
-static_assert(alignof(test14) == 8, "foo"); // expected-warning {{'alignof' applied to an expression is a GNU extension}}
+static_assert(alignof(test14) == 4, "foo"); // expected-warning {{'alignof' applied to an expression is a GNU extension}}
// PR19992
static_assert(alignof(int[]) == alignof(int), ""); // ok