From 88d874de6395a5422caad1f61783dadd395d49d0 Mon Sep 17 00:00:00 2001
From: Eduard-Mihai Burtescu <edy.burt@gmail.com>
Date: Mon, 10 Feb 2020 22:52:20 +0200
Subject: [PATCH] rustc_codegen_llvm: avoid converting between DILocation and
 Value.

---
 compiler/rustc_codegen_llvm/src/debuginfo/mod.rs     |  3 ++-
 .../rustc_codegen_llvm/src/debuginfo/source_loc.rs   |  6 +++---
 compiler/rustc_codegen_llvm/src/llvm/ffi.rs          | 12 +++++++-----
 compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp     |  8 ++++----
 4 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
index 3f47c62ccae..c940656b256 100644
--- a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
@@ -192,7 +192,8 @@ impl DebugInfoBuilderMethods for Builder<'a, 'll, 'tcx> {
         let dbg_loc = self.cx().create_debug_loc(scope, span);
 
         unsafe {
-            llvm::LLVMSetCurrentDebugLocation(self.llbuilder, dbg_loc);
+            let dbg_loc_as_llval = llvm::LLVMRustMetadataAsValue(self.cx().llcx, dbg_loc);
+            llvm::LLVMSetCurrentDebugLocation(self.llbuilder, dbg_loc_as_llval);
         }
     }
     fn insert_reference_to_gdb_debug_scripts_section_global(&mut self) {
diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/source_loc.rs b/compiler/rustc_codegen_llvm/src/debuginfo/source_loc.rs
index 517246cd0b2..f1d9b8653bc 100644
--- a/compiler/rustc_codegen_llvm/src/debuginfo/source_loc.rs
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/source_loc.rs
@@ -2,8 +2,8 @@ use super::metadata::{UNKNOWN_COLUMN_NUMBER, UNKNOWN_LINE_NUMBER};
 use super::utils::debug_context;
 
 use crate::common::CodegenCx;
-use crate::llvm::debuginfo::DIScope;
-use crate::llvm::{self, Value};
+use crate::llvm;
+use crate::llvm::debuginfo::{DILocation, DIScope};
 use rustc_codegen_ssa::traits::*;
 
 use rustc_data_structures::sync::Lrc;
@@ -45,7 +45,7 @@ impl CodegenCx<'ll, '_> {
         }
     }
 
-    pub fn create_debug_loc(&self, scope: &'ll DIScope, span: Span) -> &'ll Value {
+    pub fn create_debug_loc(&self, scope: &'ll DIScope, span: Span) -> &'ll DILocation {
         let DebugLoc { line, col, .. } = self.lookup_debug_loc(span.lo());
 
         unsafe {
diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index 8305f654e03..daceda20097 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -5,8 +5,9 @@ use rustc_codegen_ssa::coverageinfo::map as coverage_map;
 
 use super::debuginfo::{
     DIArray, DIBasicType, DIBuilder, DICompositeType, DIDerivedType, DIDescriptor, DIEnumerator,
-    DIFile, DIFlags, DIGlobalVariableExpression, DILexicalBlock, DINameSpace, DISPFlags, DIScope,
-    DISubprogram, DISubrange, DITemplateTypeParameter, DIType, DIVariable, DebugEmissionKind,
+    DIFile, DIFlags, DIGlobalVariableExpression, DILexicalBlock, DILocation, DINameSpace,
+    DISPFlags, DIScope, DISubprogram, DISubrange, DITemplateTypeParameter, DIType, DIVariable,
+    DebugEmissionKind,
 };
 
 use libc::{c_char, c_int, c_uint, size_t};
@@ -794,6 +795,7 @@ pub mod debuginfo {
     pub struct DIBuilder<'a>(InvariantOpaque<'a>);
 
     pub type DIDescriptor = Metadata;
+    pub type DILocation = Metadata;
     pub type DIScope = DIDescriptor;
     pub type DIFile = DIScope;
     pub type DILexicalBlock = DIScope;
@@ -2005,7 +2007,7 @@ extern "C" {
         VarInfo: &'a DIVariable,
         AddrOps: *const i64,
         AddrOpsCount: c_uint,
-        DL: &'a Value,
+        DL: &'a DILocation,
         InsertAtEnd: &'a BasicBlock,
     ) -> &'a Value;
 
@@ -2093,8 +2095,8 @@ extern "C" {
         Line: c_uint,
         Column: c_uint,
         Scope: &'a DIScope,
-        InlinedAt: Option<&'a Metadata>,
-    ) -> &'a Value;
+        InlinedAt: Option<&'a DILocation>,
+    ) -> &'a DILocation;
     pub fn LLVMRustDIBuilderCreateOpDeref() -> i64;
     pub fn LLVMRustDIBuilderCreateOpPlusUconst() -> i64;
 
diff --git a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
index dbd02a0ca3d..3beb328339e 100644
--- a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
@@ -931,12 +931,12 @@ LLVMRustDIBuilderGetOrCreateArray(LLVMRustDIBuilderRef Builder,
 
 extern "C" LLVMValueRef LLVMRustDIBuilderInsertDeclareAtEnd(
     LLVMRustDIBuilderRef Builder, LLVMValueRef V, LLVMMetadataRef VarInfo,
-    int64_t *AddrOps, unsigned AddrOpsCount, LLVMValueRef DL,
+    int64_t *AddrOps, unsigned AddrOpsCount, LLVMMetadataRef DL,
     LLVMBasicBlockRef InsertAtEnd) {
   return wrap(Builder->insertDeclare(
       unwrap(V), unwrap<DILocalVariable>(VarInfo),
       Builder->createExpression(llvm::ArrayRef<int64_t>(AddrOps, AddrOpsCount)),
-      DebugLoc(cast<MDNode>(unwrap<MetadataAsValue>(DL)->getMetadata())),
+      DebugLoc(cast<MDNode>(DL)),
       unwrap(InsertAtEnd)));
 }
 
@@ -1003,7 +1003,7 @@ LLVMRustDICompositeTypeReplaceArrays(LLVMRustDIBuilderRef Builder,
                          DINodeArray(unwrap<MDTuple>(Params)));
 }
 
-extern "C" LLVMValueRef
+extern "C" LLVMMetadataRef
 LLVMRustDIBuilderCreateDebugLocation(LLVMContextRef ContextRef, unsigned Line,
                                      unsigned Column, LLVMMetadataRef Scope,
                                      LLVMMetadataRef InlinedAt) {
@@ -1012,7 +1012,7 @@ LLVMRustDIBuilderCreateDebugLocation(LLVMContextRef ContextRef, unsigned Line,
   DebugLoc debug_loc = DebugLoc::get(Line, Column, unwrapDIPtr<MDNode>(Scope),
                                      unwrapDIPtr<MDNode>(InlinedAt));
 
-  return wrap(MetadataAsValue::get(Context, debug_loc.getAsMDNode()));
+  return wrap(debug_loc.getAsMDNode());
 }
 
 extern "C" int64_t LLVMRustDIBuilderCreateOpDeref() {