28 lines
874 B
C++
28 lines
874 B
C++
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// RUN: %clang_cc1 -triple armv7-apple-ios -emit-llvm -o - %s | FileCheck %s
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struct Empty {};
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Empty emptyvar;
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int take_args(int a, ...) {
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__builtin_va_list l;
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__builtin_va_start(l, a);
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// CHECK: call void @llvm.va_start
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emptyvar = __builtin_va_arg(l, Empty);
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// CHECK: load i8*, i8**
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// CHECK-NOT: getelementptr
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// CHECK: [[EMPTY_PTR:%[a-zA-Z0-9._]+]] = bitcast i8* {{%[a-zA-Z0-9._]+}} to %struct.Empty*
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// It's conceivable that EMPTY_PTR may not actually be a valid pointer
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// (e.g. it's at the very bottom of the stack and the next page is
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// invalid). This doesn't matter provided it's never loaded (there's no
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// well-defined way to tell), but it becomes a problem if we do try to use it.
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// CHECK-NOT: load %struct.Empty, %struct.Empty* [[EMPTY_PTR]]
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int i = __builtin_va_arg(l, int);
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// CHECK: load i32, i32*
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__builtin_va_end(l);
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return i;
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}
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