1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
// For more information about type metadata and type metadata identifiers for cross-language LLVM
// CFI support, see Type metadata in the design document in the tracking issue #89653.
use rustc_middle::ty::{FnSig, Ty, TyCtxt};
use rustc_target::abi::call::FnAbi;
use std::hash::Hasher;
use twox_hash::XxHash64;
mod typeid_itanium_cxx_abi;
use typeid_itanium_cxx_abi::TypeIdOptions;
/// Returns a type metadata identifier for the specified FnAbi.
pub fn typeid_for_fnabi<'tcx>(tcx: TyCtxt<'tcx>, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> String {
typeid_itanium_cxx_abi::typeid_for_fnabi(tcx, fn_abi, TypeIdOptions::NO_OPTIONS)
}
/// Returns a type metadata identifier for the specified FnSig.
pub fn typeid_for_fnsig<'tcx>(tcx: TyCtxt<'tcx>, fn_sig: &FnSig<'tcx>) -> String {
typeid_itanium_cxx_abi::typeid_for_fnsig(tcx, fn_sig, TypeIdOptions::NO_OPTIONS)
}
/// Returns an LLVM KCFI type metadata identifier for the specified FnAbi.
pub fn kcfi_typeid_for_fnabi<'tcx>(tcx: TyCtxt<'tcx>, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> u32 {
// An LLVM KCFI type metadata identifier is a 32-bit constant produced by taking the lower half
// of the xxHash64 of the type metadata identifier. (See llvm/llvm-project@cff5bef.)
let mut hash: XxHash64 = Default::default();
hash.write(
typeid_itanium_cxx_abi::typeid_for_fnabi(tcx, fn_abi, TypeIdOptions::NO_OPTIONS).as_bytes(),
);
hash.finish() as u32
}
/// Returns an LLVM KCFI type metadata identifier for the specified FnSig.
pub fn kcfi_typeid_for_fnsig<'tcx>(tcx: TyCtxt<'tcx>, fn_sig: &FnSig<'tcx>) -> u32 {
// An LLVM KCFI type metadata identifier is a 32-bit constant produced by taking the lower half
// of the xxHash64 of the type metadata identifier. (See llvm/llvm-project@cff5bef.)
let mut hash: XxHash64 = Default::default();
hash.write(
typeid_itanium_cxx_abi::typeid_for_fnsig(tcx, fn_sig, TypeIdOptions::NO_OPTIONS).as_bytes(),
);
hash.finish() as u32
}
|
