3 files changed, 14 insertions, 12 deletions
diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/dwarf_const.rs b/compiler/rustc_codegen_llvm/src/debuginfo/dwarf_const.rs
index f0542264404..40842915222 100644
--- a/compiler/rustc_codegen_llvm/src/debuginfo/dwarf_const.rs
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/dwarf_const.rs
@@ -27,3 +27,11 @@ declare_constant!(DW_ATE_float: c_uint);
 declare_constant!(DW_ATE_signed: c_uint);
 declare_constant!(DW_ATE_unsigned: c_uint);
 declare_constant!(DW_ATE_UTF: c_uint);
+
+// DWARF expression operators.
+declare_constant!(DW_OP_deref: u64);
+declare_constant!(DW_OP_plus_uconst: u64);
+/// Defined by LLVM in `llvm/include/llvm/BinaryFormat/Dwarf.h`.
+/// Double-checked by a static assertion in `RustWrapper.cpp`.
+#[allow(non_upper_case_globals)]
+pub(crate) const DW_OP_LLVM_fragment: u64 = 0x1000;
diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
index 1c941cd92dc..cb18f3cd78b 100644
--- a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
@@ -153,29 +153,26 @@ impl<'ll> DebugInfoBuilderMethods for Builder<'_, 'll, '_> {
         indirect_offsets: &[Size],
         fragment: Option<Range<Size>>,
     ) {
+        use dwarf_const::{DW_OP_LLVM_fragment, DW_OP_deref, DW_OP_plus_uconst};
+
         // Convert the direct and indirect offsets and fragment byte range to address ops.
-        // FIXME(eddyb) use `const`s instead of getting the values via FFI,
-        // the values should match the ones in the DWARF standard anyway.
-        let op_deref = || unsafe { llvm::LLVMRustDIBuilderCreateOpDeref() };
-        let op_plus_uconst = || unsafe { llvm::LLVMRustDIBuilderCreateOpPlusUconst() };
-        let op_llvm_fragment = || unsafe { llvm::LLVMRustDIBuilderCreateOpLLVMFragment() };
         let mut addr_ops = SmallVec::<[u64; 8]>::new();
 
         if direct_offset.bytes() > 0 {
-            addr_ops.push(op_plus_uconst());
+            addr_ops.push(DW_OP_plus_uconst);
             addr_ops.push(direct_offset.bytes() as u64);
         }
         for &offset in indirect_offsets {
-            addr_ops.push(op_deref());
+            addr_ops.push(DW_OP_deref);
             if offset.bytes() > 0 {
-                addr_ops.push(op_plus_uconst());
+                addr_ops.push(DW_OP_plus_uconst);
                 addr_ops.push(offset.bytes() as u64);
             }
         }
         if let Some(fragment) = fragment {
             // `DW_OP_LLVM_fragment` takes as arguments the fragment's
             // offset and size, both of them in bits.
-            addr_ops.push(op_llvm_fragment());
+            addr_ops.push(DW_OP_LLVM_fragment);
             addr_ops.push(fragment.start.bits() as u64);
             addr_ops.push((fragment.end - fragment.start).bits() as u64);
         }
diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index 21be66cb29b..bb324ee682c 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -2177,9 +2177,6 @@ unsafe extern "C" {
         Location: &'a DILocation,
         BD: c_uint,
     ) -> Option<&'a DILocation>;
-    pub fn LLVMRustDIBuilderCreateOpDeref() -> u64;
-    pub fn LLVMRustDIBuilderCreateOpPlusUconst() -> u64;
-    pub fn LLVMRustDIBuilderCreateOpLLVMFragment() -> u64;
 
     pub fn LLVMRustWriteTypeToString(Type: &Type, s: &RustString);
     pub fn LLVMRustWriteValueToString(value_ref: &Value, s: &RustString);