From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:19:13 +0200 Subject: Merging upstream version 1.68.2+dfsg1. Signed-off-by: Daniel Baumann --- compiler/rustc_symbol_mangling/src/typeid.rs | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'compiler/rustc_symbol_mangling/src/typeid.rs') diff --git a/compiler/rustc_symbol_mangling/src/typeid.rs b/compiler/rustc_symbol_mangling/src/typeid.rs index 9228bea43..53983bed7 100644 --- a/compiler/rustc_symbol_mangling/src/typeid.rs +++ b/compiler/rustc_symbol_mangling/src/typeid.rs @@ -3,6 +3,8 @@ 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; @@ -16,3 +18,25 @@ pub fn typeid_for_fnabi<'tcx>(tcx: TyCtxt<'tcx>, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) 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 +} -- cgit v1.2.3