Rollup merge of #146763 - Zalathar:di-builder, r=jdonszelmann

cg_llvm: Replace some DIBuilder wrappers with LLVM-C API bindings (part 5)

- Part of rust-lang/rust#134001
- Follow-up to rust-lang/rust#146673

---

This is another batch of LLVMDIBuilder binding migrations, replacing some our own LLVMRust bindings with bindings to upstream LLVM-C APIs.

Some of these are a little more complex than most of the previous migrations, because they split one LLVMRust binding into multiple LLVM bindings, but nothing too fancy.

This appears to be the last of the low-hanging fruit. As noted in https://github.com/rust-lang/rust/issues/134001#issuecomment-2524979268, the remaining bindings are difficult or impossible to migrate at present.

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -25,8 +25,8 @@ use rustc_target::spec::SymbolVisibility;
 use super::RustString;
 use super::debuginfo::{
     DIArray, DIBuilder, DIDerivedType, DIDescriptor, DIEnumerator, DIFile, DIFlags,
-    DIGlobalVariableExpression, DILocation, DISPFlags, DIScope, DISubprogram, DISubrange,
-    DITemplateTypeParameter, DIType, DIVariable, DebugEmissionKind, DebugNameTableKind,
+    DIGlobalVariableExpression, DILocation, DISPFlags, DIScope, DISubprogram,
+    DITemplateTypeParameter, DIType, DebugEmissionKind, DebugNameTableKind,
 };
 use crate::llvm;
 
@@ -807,6 +807,8 @@ unsafe extern "C" {
     pub(crate) type Metadata;
     pub(crate) type BasicBlock;
     pub(crate) type Comdat;
+    /// `&'ll DbgRecord` represents `LLVMDbgRecordRef`.
+    pub(crate) type DbgRecord;
 }
 #[repr(C)]
 pub(crate) struct Builder<'a>(InvariantOpaque<'a>);
@@ -891,7 +893,6 @@ pub(crate) mod debuginfo {
     pub(crate) type DIVariable = DIDescriptor;
     pub(crate) type DIGlobalVariableExpression = DIDescriptor;
     pub(crate) type DIArray = DIDescriptor;
-    pub(crate) type DISubrange = DIDescriptor;
     pub(crate) type DIEnumerator = DIDescriptor;
     pub(crate) type DITemplateTypeParameter = DIDescriptor;
 
@@ -1992,6 +1993,59 @@ unsafe extern "C" {
         Scope: Option<&'ll Metadata>,
         AlignInBits: u32, // (optional; default is 0)
     ) -> &'ll Metadata;
+
+    pub(crate) fn LLVMDIBuilderGetOrCreateSubrange<'ll>(
+        Builder: &DIBuilder<'ll>,
+        LowerBound: i64,
+        Count: i64,
+    ) -> &'ll Metadata;
+
+    pub(crate) fn LLVMDIBuilderGetOrCreateArray<'ll>(
+        Builder: &DIBuilder<'ll>,
+        Data: *const Option<&'ll Metadata>,
+        NumElements: size_t,
+    ) -> &'ll Metadata;
+
+    pub(crate) fn LLVMDIBuilderCreateExpression<'ll>(
+        Builder: &DIBuilder<'ll>,
+        Addr: *const u64,
+        Length: size_t,
+    ) -> &'ll Metadata;
+
+    pub(crate) fn LLVMDIBuilderInsertDeclareRecordAtEnd<'ll>(
+        Builder: &DIBuilder<'ll>,
+        Storage: &'ll Value,
+        VarInfo: &'ll Metadata,
+        Expr: &'ll Metadata,
+        DebugLoc: &'ll Metadata,
+        Block: &'ll BasicBlock,
+    ) -> &'ll DbgRecord;
+
+    pub(crate) fn LLVMDIBuilderCreateAutoVariable<'ll>(
+        Builder: &DIBuilder<'ll>,
+        Scope: &'ll Metadata,
+        Name: *const c_uchar, // See "PTR_LEN_STR".
+        NameLen: size_t,
+        File: &'ll Metadata,
+        LineNo: c_uint,
+        Ty: &'ll Metadata,
+        AlwaysPreserve: llvm::Bool, // "If true, this descriptor will survive optimizations."
+        Flags: DIFlags,
+        AlignInBits: u32,
+    ) -> &'ll Metadata;
+
+    pub(crate) fn LLVMDIBuilderCreateParameterVariable<'ll>(
+        Builder: &DIBuilder<'ll>,
+        Scope: &'ll Metadata,
+        Name: *const c_uchar, // See "PTR_LEN_STR".
+        NameLen: size_t,
+        ArgNo: c_uint,
+        File: &'ll Metadata,
+        LineNo: c_uint,
+        Ty: &'ll Metadata,
+        AlwaysPreserve: llvm::Bool, // "If true, this descriptor will survive optimizations."
+        Flags: DIFlags,
+    ) -> &'ll Metadata;
 }
 
 #[link(name = "llvm-wrapper", kind = "static")]
@@ -2358,43 +2412,6 @@ unsafe extern "C" {
         AlignInBits: u32,
     ) -> &'a DIGlobalVariableExpression;
 
-    pub(crate) fn LLVMRustDIBuilderCreateVariable<'a>(
-        Builder: &DIBuilder<'a>,
-        Tag: c_uint,
-        Scope: &'a DIDescriptor,
-        Name: *const c_char,
-        NameLen: size_t,
-        File: &'a DIFile,
-        LineNo: c_uint,
-        Ty: &'a DIType,
-        AlwaysPreserve: bool,
-        Flags: DIFlags,
-        ArgNo: c_uint,
-        AlignInBits: u32,
-    ) -> &'a DIVariable;
-
-    pub(crate) fn LLVMRustDIBuilderGetOrCreateSubrange<'a>(
-        Builder: &DIBuilder<'a>,
-        Lo: i64,
-        Count: i64,
-    ) -> &'a DISubrange;
-
-    pub(crate) fn LLVMRustDIBuilderGetOrCreateArray<'a>(
-        Builder: &DIBuilder<'a>,
-        Ptr: *const Option<&'a DIDescriptor>,
-        Count: c_uint,
-    ) -> &'a DIArray;
-
-    pub(crate) fn LLVMRustDIBuilderInsertDeclareAtEnd<'a>(
-        Builder: &DIBuilder<'a>,
-        Val: &'a Value,
-        VarInfo: &'a DIVariable,
-        AddrOps: *const u64,
-        AddrOpsCount: c_uint,
-        DL: &'a DILocation,
-        InsertAtEnd: &'a BasicBlock,
-    );
-
     pub(crate) fn LLVMRustDIBuilderCreateEnumerator<'a>(
         Builder: &DIBuilder<'a>,
         Name: *const c_char,