31 lines
882 B
Rust
31 lines
882 B
Rust
//@ compile-flags: -C opt-level=3
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#![crate_type = "lib"]
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#![feature(c_variadic)]
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#![no_std]
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use core::ffi::VaList;
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extern "C" {
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fn vprintf(fmt: *const i8, ap: VaList) -> i32;
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}
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// Ensure that `va_start` and `va_end` are properly injected even
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// when the "spoofed" `VaListImpl` is not used.
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#[no_mangle]
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pub unsafe extern "C" fn c_variadic_no_use(fmt: *const i8, mut ap: ...) -> i32 {
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// CHECK: call void @llvm.va_start
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vprintf(fmt, ap.as_va_list())
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// CHECK: call void @llvm.va_end
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}
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// Check that `VaListImpl::clone` gets inlined into a direct call to `llvm.va_copy`
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#[no_mangle]
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pub unsafe extern "C" fn c_variadic_clone(fmt: *const i8, mut ap: ...) -> i32 {
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// CHECK: call void @llvm.va_start
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let mut ap2 = ap.clone();
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// CHECK: call void @llvm.va_copy
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let res = vprintf(fmt, ap2.as_va_list());
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res
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// CHECK: call void @llvm.va_end
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}
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