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Fix mingw32 thiscall + sret.

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Unlike msvc, when handling a thiscall + sret gcc will
* Put the sret in %ecx
* Put the this pointer is (%esp)

This fixes, for example, calling stringstream::str.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196312 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2013-12-03 20:51:23 +00:00
parent 3916f6c45a
commit 21a9fd247e
2 changed files with 49 additions and 5 deletions
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26
lib/Target/X86/X86CallingConv.td
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@@ -453,18 +453,34 @@ def CC_X86_32_FastCall : CallingConv<[
CCDelegateTo<CC_X86_32_Common>
]>;
def CC_X86_32_ThisCall : CallingConv<[
def CC_X86_32_ThisCall_Common : CallingConv<[
// The first integer argument is passed in ECX
CCIfType<[i32], CCAssignToReg<[ECX]>>,
// Otherwise, same as everything else.
CCDelegateTo<CC_X86_32_Common>
]>;
def CC_X86_32_ThisCall_Mingw : CallingConv<[
// Promote i8/i16 arguments to i32.
CCIfType<[i8, i16], CCPromoteToType<i32>>,
CCDelegateTo<CC_X86_32_ThisCall_Common>
]>;
def CC_X86_32_ThisCall_Win : CallingConv<[
// Promote i8/i16 arguments to i32.
CCIfType<[i8, i16], CCPromoteToType<i32>>,
// Pass sret arguments indirectly through stack.
CCIfSRet<CCAssignToStack<4, 4>>,
// The first integer argument is passed in ECX
CCIfType<[i32], CCAssignToReg<[ECX]>>,
CCDelegateTo<CC_X86_32_ThisCall_Common>
]>;
// Otherwise, same as everything else.
CCDelegateTo<CC_X86_32_Common>
def CC_X86_32_ThisCall : CallingConv<[
CCIfSubtarget<"isTargetCygMing()", CCDelegateTo<CC_X86_32_ThisCall_Mingw>>,
CCDelegateTo<CC_X86_32_ThisCall_Win>
]>;
def CC_X86_32_FastCC : CallingConv<[