Merge from rustc

1 files changed, 37 insertions, 0 deletions

diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/dwarf_const.rs b/compiler/rustc_codegen_llvm/src/debuginfo/dwarf_const.rs
new file mode 100644
index 00000000000..40842915222
--- /dev/null
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/dwarf_const.rs
@@ -0,0 +1,37 @@
+//! Definitions of various DWARF-related constants.
+
+use libc::c_uint;
+
+/// Helper macro to let us redeclare gimli's constants as our own constants
+/// with a different type, with less risk of copy-paste errors.
+macro_rules! declare_constant {
+    (
+        $name:ident : $type:ty
+    ) => {
+        #[allow(non_upper_case_globals)]
+        pub(crate) const $name: $type = ::gimli::constants::$name.0 as $type;
+
+        // Assert that as-cast probably hasn't changed the value.
+        const _: () = assert!($name as i128 == ::gimli::constants::$name.0 as i128);
+    };
+}
+
+declare_constant!(DW_TAG_const_type: c_uint);
+
+// DWARF languages.
+declare_constant!(DW_LANG_Rust: c_uint);
+
+// DWARF attribute type encodings.
+declare_constant!(DW_ATE_boolean: c_uint);
+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;