Auto merge of #133990 - Walnut356:static_const, r=workingjubilee

[Debuginfo] Force enum `DISCR_*` to `static const u64` to allow for inspection via LLDB

see [here](486614878) for more info.

This change mainly helps `*-msvc` debugged with LLDB. Currently, LLDB cannot inspect `static` struct fields, so the intended visualization for enums is only borderline functional, and niche enums with ranges of discriminant cannot be determined at all .

LLDB *can* inspect `static const` values (though for whatever reason, non-enum/non-u64 consts don't work).

This change adds the `LLVMRustDIBuilderCreateQualifiedType` to the rust FFI layer to wrap the discr type with a `const` modifier, as well as forcing all generated integer enum `DISCR_*` values to be u64's. Those values will only ever be used by debugger visualizers anyway, so it shouldn't be a huge deal, but I left a fixme comment for it just in case.. The `tag` also still properly reflects the discriminant type, so no information is lost.

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -73,6 +73,9 @@ const DW_ATE_unsigned: c_uint = 0x07;
 #[allow(non_upper_case_globals)]
 const DW_ATE_UTF: c_uint = 0x10;
 
+#[allow(non_upper_case_globals)]
+const DW_TAG_const_type: c_uint = 0x26;
+
 pub(super) const UNKNOWN_LINE_NUMBER: c_uint = 0;
 pub(super) const UNKNOWN_COLUMN_NUMBER: c_uint = 0;
 

compiler/rustc_codegen_llvm/src/debuginfo/metadata/enums/cpp_like.rs

@@ -15,9 +15,9 @@ use crate::common::{AsCCharPtr, CodegenCx};
 use crate::debuginfo::metadata::enums::DiscrResult;
 use crate::debuginfo::metadata::type_map::{self, Stub, UniqueTypeId};
 use crate::debuginfo::metadata::{
-    DINodeCreationResult, NO_GENERICS, NO_SCOPE_METADATA, SmallVec, UNKNOWN_LINE_NUMBER,
-    build_field_di_node, file_metadata, file_metadata_from_def_id, size_and_align_of, type_di_node,
-    unknown_file_metadata, visibility_di_flags,
+    DINodeCreationResult, DW_TAG_const_type, NO_GENERICS, NO_SCOPE_METADATA, SmallVec,
+    UNKNOWN_LINE_NUMBER, build_field_di_node, file_metadata, file_metadata_from_def_id,
+    size_and_align_of, type_di_node, unknown_file_metadata, visibility_di_flags,
 };
 use crate::debuginfo::utils::DIB;
 use crate::llvm::debuginfo::{DIFile, DIFlags, DIType};
@@ -566,22 +566,39 @@ fn build_variant_struct_wrapper_type_di_node<'ll, 'tcx>(
                 None,
             ));
 
-            let build_assoc_const =
-                |name: &str, type_di_node: &'ll DIType, value: u64, align: Align| unsafe {
-                    llvm::LLVMRustDIBuilderCreateStaticMemberType(
-                        DIB(cx),
-                        wrapper_struct_type_di_node,
-                        name.as_c_char_ptr(),
-                        name.len(),
-                        unknown_file_metadata(cx),
-                        UNKNOWN_LINE_NUMBER,
-                        type_di_node,
-                        DIFlags::FlagZero,
-                        Some(cx.const_u64(value)),
-                        align.bits() as u32,
-                    )
+            let build_assoc_const = |name: &str,
+                                     type_di_node_: &'ll DIType,
+                                     value: u64,
+                                     align: Align| unsafe {
+                // FIXME: Currently we force all DISCR_* values to be u64's as LLDB seems to have
+                // problems inspecting other value types. Since DISCR_* is typically only going to be
+                // directly inspected via the debugger visualizer - which compares it to the `tag` value
+                // (whose type is not modified at all) it shouldn't cause any real problems.
+                let (t_di, align) = if name == ASSOC_CONST_DISCR_NAME {
+                    (type_di_node_, align.bits() as u32)
+                } else {
+                    let ty_u64 = Ty::new_uint(cx.tcx, ty::UintTy::U64);
+                    (type_di_node(cx, ty_u64), Align::EIGHT.bits() as u32)
                 };
 
+                // must wrap type in a `const` modifier for LLDB to be able to inspect the value of the member
+                let field_type =
+                    llvm::LLVMRustDIBuilderCreateQualifiedType(DIB(cx), DW_TAG_const_type, t_di);
+
+                llvm::LLVMRustDIBuilderCreateStaticMemberType(
+                    DIB(cx),
+                    wrapper_struct_type_di_node,
+                    name.as_c_char_ptr(),
+                    name.len(),
+                    unknown_file_metadata(cx),
+                    UNKNOWN_LINE_NUMBER,
+                    field_type,
+                    DIFlags::FlagZero,
+                    Some(cx.const_u64(value)),
+                    align,
+                )
+            };
+
             // We also always have an associated constant for the discriminant value
             // of the variant.
             fields.push(build_assoc_const(

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -2008,6 +2008,12 @@ unsafe extern "C" {
         AlignInBits: u32,
     ) -> &'a DIDerivedType;
 
+    pub fn LLVMRustDIBuilderCreateQualifiedType<'a>(
+        Builder: &DIBuilder<'a>,
+        Tag: c_uint,
+        Type: &'a DIType,
+    ) -> &'a DIDerivedType;
+
     pub fn LLVMRustDIBuilderCreateLexicalBlock<'a>(
         Builder: &DIBuilder<'a>,
         Scope: &'a DIScope,