314ef7bafd
When a non-trivial parameter is present, clang now gathers up all the parameters that lack inreg and puts them into a packed struct. MSVC always aligns each parameter to 4 bytes and no more, so this is a pretty simple struct to lay out. On win64, non-trivial records are passed indirectly. Prior to this change, clang was incorrectly using byval on win64. I'm able to self-host a working clang with this change and additional LLVM patches. Reviewers: rsmith Differential Revision: http://llvm-reviews.chandlerc.com/D2636 llvm-svn: 200597
28 lines
663 B
C++
28 lines
663 B
C++
// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i686-pc-win32 -mconstructor-aliases -fno-rtti | FileCheck %s
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#include <stdarg.h>
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struct A {
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A(int a) : a(a) {}
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A(const A &o) : a(o.a) {}
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~A() {}
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int a;
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};
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int foo(A a, ...) {
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va_list ap;
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va_start(ap, a);
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int sum = 0;
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for (int i = 0; i < a.a; ++i)
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sum += va_arg(ap, int);
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va_end(ap);
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return sum;
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}
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int main() {
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return foo(A(3), 1, 2, 3);
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}
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// CHECK-LABEL: define i32 @main()
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// CHECK: %[[argmem_cast:[^ ]*]] = bitcast <{ %struct.A, i32, i32, i32 }>* %argmem to <{ %struct.A }>*
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// CHECK: call i32 (<{ %struct.A }>*, ...)* @"\01?foo@@YAHUA@@ZZ"(<{ %struct.A }>* inalloca %[[argmem_cast]])
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