[LLVM-C] DIBuilder Bindings For Variable Expressions

[CodaFi]

Summary

Add DIBuilder bindings for (global) variable expressions, variable value expressions, and debug value intrinsic insertion.

[CodaFi]

A note from the test: I removed foo_inner_scope because I no longer need it to anchor the lexical block scope now that I can declare variables.

[whitequark]

LGTM, thanks!

bindings/go/llvm/DIBuilderBindings.h

 
 typedef struct LLVMOpaqueDIBuilder *LLVMDIBuilderRef;
 
 LLVMMetadataRef LLVMDIBuilderCreateTypedef(LLVMDIBuilderRef D,
                                            LLVMMetadataRef Ty, const char *Name,
                                            LLVMMetadataRef File, unsigned Line,
                                            LLVMMetadataRef Context);
 
-LLVMValueRef LLVMDIBuilderInsertValueAtEnd(LLVMDIBuilderRef D, LLVMValueRef Val,
-                                           LLVMMetadataRef VarInfo,
-                                           LLVMMetadataRef Expr,
-                                           LLVMBasicBlockRef Block);
-
 #ifdef __cplusplus
 } // extern "C"
 #endif
 
 #endif

bindings/go/llvm/DIBuilderBindings.cpp

LLVMMetadataRef LLVMDIBuilderCreateTypedef(LLVMDIBuilderRef Dref,
                                            LLVMMetadataRef Ty, const char *Name,
                                            LLVMMetadataRef File, unsigned Line,
                                            LLVMMetadataRef Context) {
   DIBuilder *D = unwrap(Dref);
   return wrap(D->createTypedef(unwrap<DIType>(Ty), Name,
                                File ? unwrap<DIFile>(File) : nullptr, Line,
                                Context ? unwrap<DIScope>(Context) : nullptr));
 }
-
-LLVMValueRef LLVMDIBuilderInsertValueAtEnd(LLVMDIBuilderRef Dref,
-                                           LLVMValueRef Val,
-                                           LLVMMetadataRef VarInfo,
-                                           LLVMMetadataRef Expr,
-                                           LLVMBasicBlockRef Block) {
-  // Fail immediately here until the llgo folks update their bindings.  The
-  // called function is going to assert out anyway.
-  llvm_unreachable("DIBuilder API change requires a DebugLoc");
-
-  DIBuilder *D = unwrap(Dref);
-  Instruction *Instr = D->insertDbgValueIntrinsic(
-      unwrap(Val), unwrap<DILocalVariable>(VarInfo), unwrap<DIExpression>(Expr),
-      /* DebugLoc */ nullptr, unwrap(Block));
-  return wrap(Instr);
-}

bindings/go/llvm/dibuilder.go

 func (d *DIBuilder) InsertDeclareAtEnd(v Value, diVarInfo, expr Metadata, bb BasicBlock) Value {
   result := C.LLVMDIBuilderInsertDeclareAtEnd(d.ref, v.C, diVarInfo.C, expr.C, nil, bb.C)
   return Value{C: result}
 }
 
 // InsertValueAtEnd inserts a call to llvm.dbg.value at the end of the
 // specified basic block for the given value and associated debug metadata.
 func (d *DIBuilder) InsertValueAtEnd(v Value, diVarInfo, expr Metadata, bb BasicBlock) Value {
-  result := C.LLVMDIBuilderInsertValueAtEnd(d.ref, v.C, diVarInfo.C, expr.C, bb.C)
+  result := C.LLVMDIBuilderInsertDbgValueAtEnd(d.ref, v.C, diVarInfo.C, expr.C, nil, bb.C)
   return Value{C: result}
 }
 
 func (v Value) SetSubprogram(sp Metadata) {
   C.LLVMSetSubprogram(v.C, sp.C)
 }
 
 func boolToCInt(v bool) C.int {
   if v {
     return 1
   }
   return 0
 }

include/llvm-c/DebugInfo.h

  * \param Builder     The DIBuilder.
  * \param Addr        An array of complex address operations.
  * \param Length      Length of the address operation array.
  */
 LLVMMetadataRef LLVMDIBuilderCreateExpression(LLVMDIBuilderRef Builder,
                                               int64_t *Addr, size_t Length);
 
 /**
+ * Create a new descriptor for the specified variable that does not have an
+ * address, but does have a constant value.
+ * \param Builder     The DIBuilder.
+ * \param Value       The constant value.
+ */
+LLVMMetadataRef
+LLVMDIBuilderCreateConstantValueExpression(LLVMDIBuilderRef Builder,
+                                           int64_t Value);
+
+/**
+ * Create a new descriptor for the specified variable.
+ * \param Scope       Variable scope.
+ * \param Name        Name of the variable.
+ * \param NameLen     The length of the C string passed to \c Name.
+ * \param Linkage     Mangled  name of the variable.
+ * \param LinkLen     The length of the C string passed to \c Linkage.
+ * \param File        File where this variable is defined.
+ * \param LineNo      Line number.
+ * \param Ty          Variable Type.
+ * \param LocalToUnit Boolean flag indicate whether this variable is
+ *                    externally visible or not.
+ * \param Expr        The location of the global relative to the attached
+ *                    GlobalVariable.
+ * \param Decl        Reference to the corresponding declaration.
+ * \param AlignInBits Variable alignment(or 0 if no alignment attr was
+ *                    specified)
+ */
+LLVMMetadataRef
+LLVMDIBuilderCreateGlobalVariableExpression(LLVMDIBuilderRef Builder,
+                                            LLVMMetadataRef Scope,
+                                            const char *Name, size_t NameLen,
+                                            const char *Linkage, size_t LinkLen,
+                                            LLVMMetadataRef File,
+                                            unsigned LineNo,
+                                            LLVMMetadataRef Ty,
+                                            LLVMBool LocalToUnit,
+                                            LLVMMetadataRef Expr,
+                                            LLVMMetadataRef Decl,
+                                            uint32_t AlignInBits);
+
+/**
+ * Create a new descriptor for the specified global variable that is temporary
+ * and meant to be RAUWed.
+ * \param Scope       Variable scope.
+ * \param Name        Name of the variable.
+ * \param NameLen     The length of the C string passed to \c Name.
+ * \param Linkage     Mangled  name of the variable.
+ * \param LnkLen      The length of the C string passed to \c Linkage.
+ * \param File        File where this variable is defined.
+ * \param LineNo      Line number.
+ * \param Ty          Variable Type.
+ * \param LocalToUnit Boolean flag indicate whether this variable is
+ *                    externally visible or not.
+ * \param Expr        The location of the global relative to the attached
+ *                    GlobalVariable.
+ * \param Decl        Reference to the corresponding declaration.
+ * \param AlignInBits Variable alignment(or 0 if no alignment attr was
+ *                    specified)
+ */
+LLVMMetadataRef
+LLVMDIBuilderCreateTempGlobalVariableFwdDecl(LLVMDIBuilderRef Builder,
+                                             LLVMMetadataRef Scope,
+                                             const char *Name, size_t NameLen,
+                                             const char *Linkage, size_t LnkLen,
+                                             LLVMMetadataRef File,
+                                             unsigned LineNo,
+                                             LLVMMetadataRef Ty,
+                                             LLVMBool LocalToUnit,
+                                             LLVMMetadataRef Decl,
+                                             uint32_t AlignInBits);
+
+/**
  * Insert a new llvm.dbg.declare intrinsic call before the given instruction.
  * \param Builder     The DIBuilder.
  * \param Storage     The storage of the variable to declare.
  * \param VarInfo     The variable's debug info descriptor.
  * \param Expr        A complex location expression for the variable.
  * \param DebugLoc    Debug info location.
  * \param Instr       Instruction acting as a location for the new intrinsic.
  */

  * \param DebugLoc    Debug info location.
  * \param Block       Basic block acting as a location for the new intrinsic.
  */
 LLVMValueRef LLVMDIBuilderInsertDeclareAtEnd(
     LLVMDIBuilderRef Builder, LLVMValueRef Storage, LLVMMetadataRef VarInfo,
     LLVMMetadataRef Expr, LLVMMetadataRef DebugLoc, LLVMBasicBlockRef Block);
 
 /**
+ * Insert a new llvm.dbg.value intrinsic call before the given instruction.
+ * \param Builder     The DIBuilder.
+ * \param Val         The value of the variable.
+ * \param VarInfo     The variable's debug info descriptor.
+ * \param Expr        A complex location expression for the variable.
+ * \param DebugLoc    Debug info location.
+ * \param Instr       Instruction acting as a location for the new intrinsic.
+ */
+LLVMValueRef LLVMDIBuilderInsertDbgValueBefore(LLVMDIBuilderRef Builder,
+                                               LLVMValueRef Val,
+                                               LLVMMetadataRef VarInfo,
+                                               LLVMMetadataRef Expr,
+                                               LLVMMetadataRef DebugLoc,
+                                               LLVMValueRef Instr);
+
+/**
+ * Insert a new llvm.dbg.value intrinsic call at the end of the given basic
+ * block. If the basic block has a terminator instruction, the intrinsic is
+ * inserted before that terminator instruction.
+ * \param Builder     The DIBuilder.
+ * \param Val         The value of the variable.
+ * \param VarInfo     The variable's debug info descriptor.
+ * \param Expr        A complex location expression for the variable.
+ * \param DebugLoc    Debug info location.
+ * \param Block       Basic block acting as a location for the new intrinsic.
+ */
+LLVMValueRef LLVMDIBuilderInsertDbgValueAtEnd(LLVMDIBuilderRef Builder,
+                                              LLVMValueRef Val,
+                                              LLVMMetadataRef VarInfo,
+                                              LLVMMetadataRef Expr,
+                                              LLVMMetadataRef DebugLoc,
+                                              LLVMBasicBlockRef Block);
+
+/**
  * Create a new descriptor for a local auto variable.
  * \param Builder         The DIBuilder.
  * \param Scope           The local scope the variable is declared in.
  * \param Name            Variable name.
  * \param NameLen         Length of variable name.
  * \param File            File where this variable is defined.
  * \param LineNo          Line number.
  * \param Ty              Metadata describing the type of the variable.

lib/IR/DebugInfo.cpp

 }
 
 LLVMMetadataRef LLVMDIBuilderCreateExpression(LLVMDIBuilderRef Builder,
                                               int64_t *Addr, size_t Length) {
   return wrap(unwrap(Builder)->createExpression(ArrayRef<int64_t>(Addr,
                                                                   Length)));
 }
 
+LLVMMetadataRef
+LLVMDIBuilderCreateConstantValueExpression(LLVMDIBuilderRef Builder,
+                                           int64_t Value) {
+  return wrap(unwrap(Builder)->createConstantValueExpression(Value));
+}
+
+LLVMMetadataRef
+LLVMDIBuilderCreateGlobalVariableExpression(LLVMDIBuilderRef Builder,
+                                            LLVMMetadataRef Scope,
+                                            const char *Name, size_t NameLen,
+                                            const char *Linkage, size_t LinkLen,
+                                            LLVMMetadataRef File,
+                                            unsigned LineNo,
+                                            LLVMMetadataRef Ty,
+                                            LLVMBool LocalToUnit,
+                                            LLVMMetadataRef Expr,
+                                            LLVMMetadataRef Decl,
+                                            uint32_t AlignInBits) {
+  return wrap(unwrap(Builder)->createGlobalVariableExpression(
+                  unwrapDI<DIScope>(Scope), {Name, NameLen}, {Linkage, LinkLen},
+                  unwrapDI<DIFile>(File), LineNo, unwrapDI<DIType>(Ty),
+                  LocalToUnit, unwrap<DIExpression>(Expr),
+                  unwrapDI<MDNode>(Decl), AlignInBits));
+}
+
+LLVMMetadataRef
+LLVMDIBuilderCreateTempGlobalVariableFwdDecl(LLVMDIBuilderRef Builder,
+                                             LLVMMetadataRef Scope,
+                                             const char *Name, size_t NameLen,
+                                             const char *Linkage, size_t LnkLen,
+                                             LLVMMetadataRef File,
+                                             unsigned LineNo,
+                                             LLVMMetadataRef Ty,
+                                             LLVMBool LocalToUnit,
+                                             LLVMMetadataRef Decl,
+                                             uint32_t AlignInBits) {
+  return wrap(unwrap(Builder)->createTempGlobalVariableFwdDecl(
+                  unwrapDI<DIScope>(Scope), {Name, NameLen}, {Linkage, LnkLen},
+                  unwrapDI<DIFile>(File), LineNo, unwrapDI<DIType>(Ty),
+                  LocalToUnit, unwrapDI<MDNode>(Decl), AlignInBits));
+}
+
 LLVMValueRef LLVMDIBuilderInsertDeclareBefore(
   LLVMDIBuilderRef Builder, LLVMValueRef Storage, LLVMMetadataRef VarInfo,
   LLVMMetadataRef Expr, LLVMMetadataRef DL, LLVMValueRef Instr) {
   return wrap(unwrap(Builder)->insertDeclare(
                   unwrap(Storage), unwrap<DILocalVariable>(VarInfo),
                   unwrap<DIExpression>(Expr), unwrap<DILocation>(DL),
                   unwrap<Instruction>(Instr)));
 }
 
 LLVMValueRef LLVMDIBuilderInsertDeclareAtEnd(
     LLVMDIBuilderRef Builder, LLVMValueRef Storage, LLVMMetadataRef VarInfo,
     LLVMMetadataRef Expr, LLVMMetadataRef DL, LLVMBasicBlockRef Block) {
   return wrap(unwrap(Builder)->insertDeclare(
                   unwrap(Storage), unwrap<DILocalVariable>(VarInfo),
                   unwrap<DIExpression>(Expr), unwrap<DILocation>(DL),
                   unwrap(Block)));
 }
 
+LLVMValueRef LLVMDIBuilderInsertDbgValueBefore(LLVMDIBuilderRef Builder,
+                                               LLVMValueRef Val,
+                                               LLVMMetadataRef VarInfo,
+                                               LLVMMetadataRef Expr,
+                                               LLVMMetadataRef DebugLoc,
+                                               LLVMValueRef Instr) {
+  return wrap(unwrap(Builder)->insertDbgValueIntrinsic(
+                  unwrap(Val), unwrap<DILocalVariable>(VarInfo),
+                  unwrap<DIExpression>(Expr), unwrap<DILocation>(DebugLoc),
+                  unwrap<Instruction>(Instr)));
+}
+
+LLVMValueRef LLVMDIBuilderInsertDbgValueAtEnd(LLVMDIBuilderRef Builder,
+                                              LLVMValueRef Val,
+                                              LLVMMetadataRef VarInfo,
+                                              LLVMMetadataRef Expr,
+                                              LLVMMetadataRef DebugLoc,
+                                              LLVMBasicBlockRef Block) {
+  return wrap(unwrap(Builder)->insertDbgValueIntrinsic(
+                  unwrap(Val), unwrap<DILocalVariable>(VarInfo),
+                  unwrap<DIExpression>(Expr), unwrap<DILocation>(DebugLoc),
+                  unwrap(Block)));
+}
+
 LLVMMetadataRef LLVMDIBuilderCreateAutoVariable(
     LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
     size_t NameLen, LLVMMetadataRef File, unsigned LineNo, LLVMMetadataRef Ty,
     LLVMBool AlwaysPreserve, LLVMDIFlags Flags, uint32_t AlignInBits) {
   return wrap(unwrap(Builder)->createAutoVariable(
                   unwrap<DIScope>(Scope), {Name, NameLen}, unwrap<DIFile>(File),
                   LineNo, unwrap<DIType>(Ty), AlwaysPreserve,
                   map_from_llvmDIFlags(Flags), AlignInBits));

test/Bindings/llvm-c/debug_info.ll

 ; RUN: llvm-c-test --test-dibuilder | FileCheck %s
 
 ; CHECK: ; ModuleID = 'debuginfo.c'
 ; CHECK-NEXT: source_filename = "debuginfo.c"
 
-; CHECK:      define i64 @foo(i64, i64, <10 x i64>) !dbg !9 {
+; CHECK:      define i64 @foo(i64, i64, <10 x i64>) !dbg !12 {
 ; CHECK-NEXT: entry:
-; CHECK-NEXT:   call void @llvm.dbg.declare(metadata i64 0, metadata !16, metadata !DIExpression()), !dbg !19
-; CHECK-NEXT:   call void @llvm.dbg.declare(metadata i64 0, metadata !17, metadata !DIExpression()), !dbg !19
-; CHECK-NEXT:   call void @llvm.dbg.declare(metadata i64 0, metadata !18, metadata !DIExpression()), !dbg !19
+; CHECK-NEXT:   call void @llvm.dbg.declare(metadata i64 0, metadata !19, metadata !DIExpression()), !dbg !24
+; CHECK-NEXT:   call void @llvm.dbg.declare(metadata i64 0, metadata !20, metadata !DIExpression()), !dbg !24
+; CHECK-NEXT:   call void @llvm.dbg.declare(metadata i64 0, metadata !21, metadata !DIExpression()), !dbg !24
+; CHECK:      vars:
+; CHECK-NEXT:   call void @llvm.dbg.value(metadata i64 0, metadata !22, metadata !DIExpression(DW_OP_constu, 0, DW_OP_stack_value)), !dbg !25
 ; CHECK-NEXT: }
 
 ; CHECK: declare void @llvm.dbg.declare(metadata, metadata, metadata) #0
-
-; CHECK: declare !dbg !20 i64 @foo_inner_scope(i64, i64, <10 x i64>)
+; CHECK: declare void @llvm.dbg.value(metadata, metadata, metadata) #0
 
 ; CHECK: !llvm.dbg.cu = !{!0}
-; CHECK: !FooType = !{!3}
+; CHECK: !FooType = !{!8}
 
-; CHECK:      !0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "llvm-c-test", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false)
+; CHECK:      !0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "llvm-c-test", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3, splitDebugInlining: false)
 ; CHECK-NEXT: !1 = !DIFile(filename: "debuginfo.c", directory: ".")
 ; CHECK-NEXT: !2 = !{}
-; CHECK-NEXT: !3 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !4, size: 192, dwarfAddressSpace: 0)
-; CHECK-NEXT: !4 = !DICompositeType(tag: DW_TAG_structure_type, name: "MyStruct", scope: !5, file: !1, size: 192, elements: !7, runtimeLang: DW_LANG_C89, identifier: "MyStruct")
-; CHECK-NEXT: !5 = !DINamespace(name: "NameSpace", scope: !6)
+; CHECK-NEXT: !3 = !{!4}
+; CHECK-NEXT: !4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression(DW_OP_constu, 0, DW_OP_stack_value))
+; CHECK-NEXT: !5 = distinct !DIGlobalVariable(name: "global", scope: !6, file: !1, line: 1, type: !7, isLocal: true, isDefinition: true)
 ; CHECK-NEXT: !6 = !DIModule(scope: null, name: "llvm-c-test", includePath: "/test/include/llvm-c-test.h")
-; CHECK-NEXT: !7 = !{!8, !8, !8}
-; CHECK-NEXT: !8 = !DIBasicType(name: "Int64", size: 64)
-; CHECK-NEXT: !9 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: !1, file: !1, line: 42, type: !10, isLocal: true, isDefinition: true, scopeLine: 42, isOptimized: false, unit: !0, variables: !15)
-; CHECK-NEXT: !10 = !DISubroutineType(types: !11)
-; CHECK-NEXT: !11 = !{!8, !8, !12}
-; CHECK-NEXT: !12 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 640, flags: DIFlagVector, elements: !13)
-; CHECK-NEXT: !13 = !{!14}
-; CHECK-NEXT: !14 = !DISubrange(count: 10)
-; CHECK-NEXT: !15 = !{!16, !17, !18}
-; CHECK-NEXT: !16 = !DILocalVariable(name: "a", arg: 1, scope: !9, file: !1, line: 42, type: !8)
-; CHECK-NEXT: !17 = !DILocalVariable(name: "b", arg: 2, scope: !9, file: !1, line: 42, type: !8)
-; CHECK-NEXT: !18 = !DILocalVariable(name: "c", arg: 3, scope: !9, file: !1, line: 42, type: !12)
-; CHECK-NEXT: !19 = !DILocation(line: 42, scope: !9)
-; CHECK-NEXT: !20 = distinct !DISubprogram(name: "foo_inner_scope", linkageName: "foo_inner_scope", scope: !21, file: !1, line: 42, type: !10, isLocal: true, isDefinition: true, scopeLine: 42, isOptimized: false, unit: !0, variables: !2)
-; CHECK-NEXT: !21 = distinct !DILexicalBlock(scope: !9, file: !1, line: 42)
+; CHECK-NEXT: !7 = !DIBasicType(name: "Int64", size: 64)
+; CHECK-NEXT: !8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 192, dwarfAddressSpace: 0)
+; CHECK-NEXT: !9 = !DICompositeType(tag: DW_TAG_structure_type, name: "MyStruct", scope: !10, file: !1, size: 192, elements: !11, runtimeLang: DW_LANG_C89, identifier: "MyStruct")
+; CHECK-NEXT: !10 = !DINamespace(name: "NameSpace", scope: !6)
+; CHECK-NEXT: !11 = !{!7, !7, !7}
+; CHECK-NEXT: !12 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: !1, file: !1, line: 42, type: !13, isLocal: true, isDefinition: true, scopeLine: 42, isOptimized: false, unit: !0, variables: !18)
+; CHECK-NEXT: !13 = !DISubroutineType(types: !14)
+; CHECK-NEXT: !14 = !{!7, !7, !15}
+; CHECK-NEXT: !15 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 640, flags: DIFlagVector, elements: !16)
+; CHECK-NEXT: !16 = !{!17}
+; CHECK-NEXT: !17 = !DISubrange(count: 10)
+; CHECK-NEXT: !18 = !{!19, !20, !21, !22}
+; CHECK-NEXT: !19 = !DILocalVariable(name: "a", arg: 1, scope: !12, file: !1, line: 42, type: !7)
+; CHECK-NEXT: !20 = !DILocalVariable(name: "b", arg: 2, scope: !12, file: !1, line: 42, type: !7)
+; CHECK-NEXT: !21 = !DILocalVariable(name: "c", arg: 3, scope: !12, file: !1, line: 42, type: !15)
+; CHECK-NEXT: !22 = !DILocalVariable(name: "d", scope: !23, file: !1, line: 43, type: !7)
+; CHECK-NEXT: !23 = distinct !DILexicalBlock(scope: !12, file: !1, line: 42)
+; CHECK-NEXT: !24 = !DILocation(line: 42, scope: !12)
+; CHECK-NEXT: !25 = !DILocation(line: 43, scope: !12)

tools/llvm-c-test/debuginfo.c

int llvm_test_dibuilder(void) {
 
   LLVMMetadataRef Module =
     LLVMDIBuilderCreateModule(DIB, CompileUnit,
                               "llvm-c-test", 11,
                               "", 0,
                               "/test/include/llvm-c-test.h", 27,
                               "", 0);
 
-  LLVMMetadataRef NameSpace =
-    LLVMDIBuilderCreateNameSpace(DIB, Module, "NameSpace", 9, false);
-
   LLVMMetadataRef Int64Ty =
     LLVMDIBuilderCreateBasicType(DIB, "Int64", 5, 64, 0);
+  LLVMMetadataRef GlobalVarValueExpr =
+    LLVMDIBuilderCreateConstantValueExpression(DIB, 0);
+  LLVMDIBuilderCreateGlobalVariableExpression(DIB, Module, "global", 6,
+                                              "", 0, File, 1, Int64Ty,
+                                              true, GlobalVarValueExpr,
+                                              NULL, 0);
+
+  LLVMMetadataRef NameSpace =
+    LLVMDIBuilderCreateNameSpace(DIB, Module, "NameSpace", 9, false);
 
   LLVMMetadataRef StructDbgElts[] = {Int64Ty, Int64Ty, Int64Ty};
   LLVMMetadataRef StructDbgTy =
     LLVMDIBuilderCreateStructType(DIB, NameSpace, "MyStruct",
     8, File, 0, 192, 0, 0, NULL, StructDbgElts, 3,
     LLVMDWARFSourceLanguageC, NULL, "MyStruct", 8);
 
   LLVMMetadataRef StructDbgPtrTy =
LLVMDIBuilderInsertDeclareAtEnd(DIB, LLVMConstInt(LLVMInt64Type(), 0, false),
                                   FooParamVar3, FooParamExpression,
                                   FooParamLocation, FooEntryBlock);
 
   LLVMSetSubprogram(FooFunction, FunctionMetadata);
 
   LLVMMetadataRef FooLexicalBlock =
     LLVMDIBuilderCreateLexicalBlock(DIB, FunctionMetadata, File, 42, 0);
 
-  LLVMValueRef InnerFooFunction =
-    LLVMAddFunction(M, "foo_inner_scope", FooFuncTy);
-  LLVMMetadataRef InnerFunctionMetadata =
-    LLVMDIBuilderCreateFunction(DIB, FooLexicalBlock, "foo_inner_scope", 15,
-                                "foo_inner_scope", 15,
-                                File, 42, FunctionTy, true, true,
-                                42, 0, false);
-  LLVMSetSubprogram(InnerFooFunction, InnerFunctionMetadata);
+  LLVMBasicBlockRef FooVarBlock = LLVMAppendBasicBlock(FooFunction, "vars");
+  LLVMMetadataRef FooVarsLocation =
+    LLVMDIBuilderCreateDebugLocation(LLVMGetGlobalContext(), 43, 0,
+                                     FunctionMetadata, NULL);
+  LLVMMetadataRef FooVar1 =
+    LLVMDIBuilderCreateAutoVariable(DIB, FooLexicalBlock, "d", 1, File,
+                                    43, Int64Ty, true, 0, 0);
+  LLVMValueRef FooVal1 = LLVMConstInt(LLVMInt64Type(), 0, false);
+  LLVMMetadataRef FooVarValueExpr =
+    LLVMDIBuilderCreateConstantValueExpression(DIB, 0);
+
+  LLVMDIBuilderInsertDbgValueAtEnd(DIB, FooVal1, FooVar1, FooVarValueExpr,
+                                   FooVarsLocation, FooVarBlock);
 
   LLVMDIBuilderFinalize(DIB);
 
   char *MStr = LLVMPrintModuleToString(M);
   puts(MStr);
   LLVMDisposeMessage(MStr);
 
   LLVMDisposeDIBuilder(DIB);
   LLVMDisposeModule(M);
 
   return 0;
 }