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author | Reid Kleckner <reid@kleckner.net> | 2014-01-31 17:41:22 +0000 |
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committer | Reid Kleckner <reid@kleckner.net> | 2014-01-31 17:41:22 +0000 |
commit | 65c98b9da474d0562f883d6001f31ba5b2b95183 (patch) | |
tree | 18a2b8a062180aa9b4f289b5caa8db5e1d7aa061 /include | |
parent | 0cb94d9adc631eafa88218a5e972d45e0cf35f61 (diff) | |
download | llvm-65c98b9da474d0562f883d6001f31ba5b2b95183.tar.gz llvm-65c98b9da474d0562f883d6001f31ba5b2b95183.tar.bz2 llvm-65c98b9da474d0562f883d6001f31ba5b2b95183.tar.xz |
[ms-cxxabi] Add a new calling convention that swaps 'this' and 'sret'
MSVC always places the 'this' parameter for a method first. The
implicit 'sret' pointer for methods always comes second. We already
implement this for __thiscall by putting sret parameters on the stack,
but __cdecl methods require putting both parameters on the stack in
opposite order.
Using a special calling convention allows frontends to keep the sret
parameter first, which avoids breaking lots of assumptions in LLVM and
Clang.
Fixes PR15768 with the corresponding change in Clang.
Reviewers: ributzka, majnemer
Differential Revision: http://llvm-reviews.chandlerc.com/D2663
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200561 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include')
-rw-r--r-- | include/llvm/IR/CallingConv.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/llvm/IR/CallingConv.h b/include/llvm/IR/CallingConv.h index 1eaf4f7f46..af44e8a30c 100644 --- a/include/llvm/IR/CallingConv.h +++ b/include/llvm/IR/CallingConv.h @@ -137,7 +137,13 @@ namespace CallingConv { /// convention differs from the more common \c X86_64_SysV convention /// in a number of ways, most notably in that XMM registers used to pass /// arguments are shadowed by GPRs, and vice versa. - X86_64_Win64 = 79 + X86_64_Win64 = 79, + + /// \brief The calling convention used for __cdecl methods on win32. + /// Differs from the C calling convention only in that the order of the + /// first parameter and the sret parameter are swapped. + X86_CDeclMethod = 80 + }; } // End CallingConv namespace |