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Name LLVM anonymous constants by a hash of their contents

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This commit is contained in:
John Kåre Alsaker 2023-02-25 08:07:31 +01:00
parent 6ffabf3c8f
commit a913a2bca9
1 changed files with 8 additions and 2 deletions
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10
compiler/rustc_codegen_llvm/src/common.rs
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@ -10,6 +10,7 @@ use crate::value::Value;
use rustc_ast::Mutability;
use rustc_codegen_ssa::mir::place::PlaceRef;
use rustc_codegen_ssa::traits::*;
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_hir::def_id::DefId;
use rustc_middle::bug;
use rustc_middle::mir::interpret::{ConstAllocation, GlobalAlloc, Scalar};
@ -252,8 +253,13 @@ impl<'ll, 'tcx> ConstMethods<'tcx> for CodegenCx<'ll, 'tcx> {
Mutability::Mut => self.static_addr_of_mut(init, alloc.align, None),
_ => self.static_addr_of(init, alloc.align, None),
};
if !self.sess().fewer_names() {
llvm::set_value_name(value, format!("{:?}", alloc_id).as_bytes());
if !self.sess().fewer_names() && llvm::get_value_name(value).is_empty() {
let hash = self.tcx.with_stable_hashing_context(|mut hcx| {
let mut hasher = StableHasher::new();
alloc.hash_stable(&mut hcx, &mut hasher);
hasher.finish::<u128>()
});
llvm::set_value_name(value, format!("alloc_{hash:032x}").as_bytes());
}
(value, AddressSpace::DATA)
}