From 88ede395cf896c0a14299be553b6084aa6a5e50d Mon Sep 17 00:00:00 2001
From: Chandler Carruth <chandlerc@gmail.com>
Date: Wed, 19 Feb 2014 22:35:01 +0000
Subject: [PATCH] Teach Clang to provide ::max_align_t in C11 and C++11 modes.
This definition is not chosen idly. There is an unfortunate reality with
max_align_t -- the specific nature of its definition leaks into the ABI
almost immediately. Because it is part of C11 and C++11 it becomes
essential for it to match with other systems on that ABI. There is an
effort to discourage any further use of this construct as a consequence
-- using max_align_t introduces an immediate ABI problem. We can never
update it to have larger alignment even as the microarchitecture changes
to necessitate higher alignment. =/
The particular definition here exactly matches the ABI of GCC's chosen
::max_align_t definition, for better or worse. This was written with the
help of Richard Smith who was decoding the exact ABI implications of the
selected definition in GCC. Notably, in-register arguments are impacted
by the particular definition chosen. =/
No one is under the illusion that this is a "good" or "useful"
definition of max_align_t, and we are working with the standards
committee to specify a more useful interface to address this need.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@201729 91177308-0d34-0410-b5e6-96231b3b80d8
---
lib/Headers/stddef.h | 10 ++++++++++
test/Headers/c11.c | 4 ++++
2 files changed, 14 insertions(+)
diff --git a/lib/Headers/stddef.h b/lib/Headers/stddef.h
index 6a64d6d32a8..b6926942ef6 100644
--- a/lib/Headers/stddef.h
+++ b/lib/Headers/stddef.h
@@ -84,6 +84,16 @@ using ::std::nullptr_t;
#endif
#endif
+#if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L
+typedef struct {
+ long long __clang_max_align_nonce1
+ __attribute__((__aligned__(__alignof__(long long))));
+ long double __clang_max_align_nonce2
+ __attribute__((__aligned__(__alignof__(long double))));
+} max_align_t;
+#define __CLANG_MAX_ALIGN_T_DEFINED
+#endif
+
#define offsetof(t, d) __builtin_offsetof(t, d)
#endif /* __STDDEF_H */
diff --git a/test/Headers/c11.c b/test/Headers/c11.c
index 11bec195446..e335d0cebcb 100644
--- a/test/Headers/c11.c
+++ b/test/Headers/c11.c
@@ -22,6 +22,10 @@ _Static_assert(__alignof(c) == 4, "");
#define __STDC_WANT_LIB_EXT1__ 1
#include <stddef.h>
rsize_t x = 0;
+_Static_assert(sizeof(max_align_t) >= sizeof(long long), "");
+_Static_assert(alignof(max_align_t) >= alignof(long long), "");
+_Static_assert(sizeof(max_align_t) >= sizeof(long double), "");
+_Static_assert(alignof(max_align_t) >= alignof(long double), "");
// If we are freestanding, then also check RSIZE_MAX (in a hosted implementation
// we will use the host stdint.h, which may not yet have C11 support).
--
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