as the variable address for NRVO variables.
Subscribers: hiraditya, cfe-commits, llvm-commits
Tags: #clang, #llvm
Differential Revision: https://reviews.llvm.org/D63361
llvm-svn: 363952
llvm::DILocalVariable *CGDebugInfo::EmitDeclare(const VarDecl *VD,
llvm::Value *Storage,
llvm::Optional<unsigned> ArgNo,
- CGBuilderTy &Builder) {
+ CGBuilderTy &Builder,
+ const bool UsePointerValue) {
assert(DebugKind >= codegenoptions::LimitedDebugInfo);
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
if (VD->hasAttr<NoDebugAttr>())
}
}
+ // Clang stores the sret pointer provided by the caller in a static alloca.
+ // Use DW_OP_deref to tell the debugger to load the pointer and treat it as
+ // the address of the variable.
+ if (UsePointerValue) {
+ assert(std::find(Expr.begin(), Expr.end(), llvm::dwarf::DW_OP_deref) ==
+ Expr.end() &&
+ "Debug info already contains DW_OP_deref.");
+ Expr.push_back(llvm::dwarf::DW_OP_deref);
+ }
+
// Create the descriptor for the variable.
auto *D = ArgNo ? DBuilder.createParameterVariable(
Scope, Name, *ArgNo, Unit, Line, Ty,
llvm::DILocalVariable *
CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD, llvm::Value *Storage,
- CGBuilderTy &Builder) {
+ CGBuilderTy &Builder,
+ const bool UsePointerValue) {
assert(DebugKind >= codegenoptions::LimitedDebugInfo);
- return EmitDeclare(VD, Storage, llvm::None, Builder);
+ return EmitDeclare(VD, Storage, llvm::None, Builder, UsePointerValue);
}
void CGDebugInfo::EmitLabel(const LabelDecl *D, CGBuilderTy &Builder) {
/// declaration.
/// Returns a pointer to the DILocalVariable associated with the
/// llvm.dbg.declare, or nullptr otherwise.
- llvm::DILocalVariable *EmitDeclareOfAutoVariable(const VarDecl *Decl,
- llvm::Value *AI,
- CGBuilderTy &Builder);
+ llvm::DILocalVariable *
+ EmitDeclareOfAutoVariable(const VarDecl *Decl, llvm::Value *AI,
+ CGBuilderTy &Builder,
+ const bool UsePointerValue = false);
/// Emit call to \c llvm.dbg.label for an label.
void EmitLabel(const LabelDecl *D, CGBuilderTy &Builder);
/// llvm.dbg.declare, or nullptr otherwise.
llvm::DILocalVariable *EmitDeclare(const VarDecl *decl, llvm::Value *AI,
llvm::Optional<unsigned> ArgNo,
- CGBuilderTy &Builder);
+ CGBuilderTy &Builder,
+ const bool UsePointerValue = false);
struct BlockByRefType {
/// The wrapper struct used inside the __block_literal struct.
getLangOpts().OpenMP
? CGM.getOpenMPRuntime().getAddressOfLocalVariable(*this, &D)
: Address::invalid();
+ bool NRVO = getLangOpts().ElideConstructors && D.isNRVOVariable();
+
if (getLangOpts().OpenMP && OpenMPLocalAddr.isValid()) {
address = OpenMPLocalAddr;
} else if (Ty->isConstantSizeType()) {
- bool NRVO = getLangOpts().ElideConstructors &&
- D.isNRVOVariable();
-
// If this value is an array or struct with a statically determinable
// constant initializer, there are optimizations we can do.
//
// Emit debug info for local var declaration.
if (EmitDebugInfo && HaveInsertPoint()) {
+ Address DebugAddr = address;
+ bool UsePointerValue = NRVO && ReturnValuePointer.isValid();
DI->setLocation(D.getLocation());
- (void)DI->EmitDeclareOfAutoVariable(&D, address.getPointer(), Builder);
+
+ // If NRVO, use a pointer to the return address.
+ if (UsePointerValue)
+ DebugAddr = ReturnValuePointer;
+
+ (void)DI->EmitDeclareOfAutoVariable(&D, DebugAddr.getPointer(), Builder,
+ UsePointerValue);
}
if (D.hasAttr<AnnotateAttr>() && HaveInsertPoint())
if (CurFnInfo->getReturnInfo().isSRetAfterThis())
++AI;
ReturnValue = Address(&*AI, CurFnInfo->getReturnInfo().getIndirectAlign());
+ if (!CurFnInfo->getReturnInfo().getIndirectByVal()) {
+ ReturnValuePointer =
+ CreateDefaultAlignTempAlloca(Int8PtrTy, "result.ptr");
+ Builder.CreateStore(Builder.CreatePointerBitCastOrAddrSpaceCast(
+ ReturnValue.getPointer(), Int8PtrTy),
+ ReturnValuePointer);
+ }
} else if (CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::InAlloca &&
!hasScalarEvaluationKind(CurFnInfo->getReturnType())) {
// Load the sret pointer from the argument struct and return into that.
llvm::Function::arg_iterator EI = CurFn->arg_end();
--EI;
llvm::Value *Addr = Builder.CreateStructGEP(nullptr, &*EI, Idx);
+ ReturnValuePointer = Address(Addr, getPointerAlign());
Addr = Builder.CreateAlignedLoad(Addr, getPointerAlign(), "agg.result");
ReturnValue = Address(Addr, getNaturalTypeAlignment(RetTy));
} else {
/// value. This is invalid iff the function has no return value.
Address ReturnValue = Address::invalid();
+ /// ReturnValuePointer - The temporary alloca to hold a pointer to sret.
+ /// This is invalid if sret is not in use.
+ Address ReturnValuePointer = Address::invalid();
+
/// Return true if a label was seen in the current scope.
bool hasLabelBeenSeenInCurrentScope() const {
if (CurLexicalScope)
// Pass and return aggregate (of size < 16 bytes) with non-trivial destructor.
// Passed directly but returned indirectly.
// CHECK: define {{.*}} void {{.*}}f4{{.*}}(%struct.S4* inreg noalias sret %agg.result)
-// CHECK: call void {{.*}}func4{{.*}}(%struct.S4* inreg sret %agg.result, [2 x i64] %4)
+// CHECK: call void {{.*}}func4{{.*}}(%struct.S4* inreg sret %agg.result, [2 x i64] %5)
struct S4 {
int a[3];
~S4();
// Pass and return from instance method called from instance method.
// CHECK: define {{.*}} void @{{.*}}bar@Q1{{.*}}(%class.Q1* %this, %class.P1* inreg noalias sret %agg.result)
-// CHECK: call void {{.*}}foo@P1{{.*}}(%class.P1* %ref.tmp, %class.P1* inreg sret %agg.result, i8 %0)
+// CHECK: call void {{.*}}foo@P1{{.*}}(%class.P1* %ref.tmp, %class.P1* inreg sret %agg.result, i8 %1)
class P1 {
public:
B test0(B &x) {
// CHECK-LABEL: define void @_ZN5test35test0ERNS_1BE(
// CHECK: [[X:%.*]] = alloca [[B:%.*]]*,
- // CHECK-NEXT: store [[B]]* {{%.*}}, [[B]]** [[X]]
+ // CHECK: store [[B]]* {{%.*}}, [[B]]** [[X]]
// CHECK-NEXT: [[T0:%.*]] = load [[B]]*, [[B]]** [[X]]
// CHECK-NEXT: [[BOOL:%.*]] = call zeroext i1 @_ZN5test31BcvbEv([[B]]* [[T0]])
// CHECK-NEXT: br i1 [[BOOL]]
B test1() {
// CHECK-LABEL: define void @_ZN5test35test1Ev(
// CHECK: [[TEMP:%.*]] = alloca [[B]],
- // CHECK-NEXT: call void @_ZN5test312test1_helperEv([[B]]* sret [[TEMP]])
+ // CHECK: call void @_ZN5test312test1_helperEv([[B]]* sret [[TEMP]])
// CHECK-NEXT: [[BOOL:%.*]] = call zeroext i1 @_ZN5test31BcvbEv([[B]]* [[TEMP]])
// CHECK-NEXT: br i1 [[BOOL]]
// CHECK: call void @_ZN5test31BC1ERKS0_([[B]]* [[RESULT:%.*]], [[B]]* dereferenceable({{[0-9]+}}) [[TEMP]])
A test2(B &x) {
// CHECK-LABEL: define void @_ZN5test35test2ERNS_1BE(
// CHECK: [[X:%.*]] = alloca [[B]]*,
- // CHECK-NEXT: store [[B]]* {{%.*}}, [[B]]** [[X]]
+ // CHECK: store [[B]]* {{%.*}}, [[B]]** [[X]]
// CHECK-NEXT: [[T0:%.*]] = load [[B]]*, [[B]]** [[X]]
// CHECK-NEXT: [[BOOL:%.*]] = call zeroext i1 @_ZN5test31BcvbEv([[B]]* [[T0]])
// CHECK-NEXT: br i1 [[BOOL]]
A test3() {
// CHECK-LABEL: define void @_ZN5test35test3Ev(
// CHECK: [[TEMP:%.*]] = alloca [[B]],
- // CHECK-NEXT: call void @_ZN5test312test3_helperEv([[B]]* sret [[TEMP]])
+ // CHECK: call void @_ZN5test312test3_helperEv([[B]]* sret [[TEMP]])
// CHECK-NEXT: [[BOOL:%.*]] = call zeroext i1 @_ZN5test31BcvbEv([[B]]* [[TEMP]])
// CHECK-NEXT: br i1 [[BOOL]]
// CHECK: call void @_ZN5test31BcvNS_1AEEv([[A]]* sret [[RESULT:%.*]], [[B]]* [[TEMP]])
--- /dev/null
+// RUN: %clangxx -target x86_64-unknown-unknown -g %s -emit-llvm -S -o - | FileCheck %s
+// RUN: %clangxx -target x86_64-unknown-unknown -g -fno-elide-constructors %s -emit-llvm -S -o - | FileCheck %s -check-prefix=NOELIDE
+struct Foo {
+ Foo() = default;
+ Foo(Foo &&other) { x = other.x; }
+ int x;
+};
+void some_function(int);
+Foo getFoo() {
+ Foo foo;
+ foo.x = 41;
+ some_function(foo.x);
+ return foo;
+}
+
+int main() {
+ Foo bar = getFoo();
+ return bar.x;
+}
+
+// Check that NRVO variables are stored as a pointer with deref if they are
+// stored in the return register.
+
+// CHECK: %result.ptr = alloca i8*, align 8
+// CHECK: call void @llvm.dbg.declare(metadata i8** %result.ptr,
+// CHECK-SAME: metadata !DIExpression(DW_OP_deref)
+// NOELIDE: call void @llvm.dbg.declare(metadata %struct.Foo* %foo,
+// NOELIDE-SAME: metadata !DIExpression()
// CHECK-NEXT: ret i32
// CHECK-LABEL: define internal void @"_ZZ1hvEN4$_118__invokeEv"(%struct.A* noalias sret %agg.result) {{.*}} {
-// CHECK-NOT: =
// CHECK: call void @"_ZZ1hvENK4$_11clEv"(%struct.A* sret %agg.result,
// CHECK-NEXT: ret void
struct A { ~A(); };
void func1(TrivialBig *);
// CHECK: define void @testTrivialBig(%[[STRUCT_TRIVIALBIG]]* noalias sret %[[AGG_RESULT:.*]])
-// CHECK-NOT: alloca
// CHECK: call void @func1(%[[STRUCT_TRIVIALBIG]]* %[[AGG_RESULT]])
// CHECK-NEXT: ret void
string get_string() {
string unused;
string result = 3;
-// DEBUGGER: break 21
+ // DEBUGGER: break 21
return result;
}
-int main() { get_string(); }
+void some_function(int) {}
+struct string2 {
+ string2() = default;
+ string2(string2 &&other) { i = other.i; }
+ int i;
+};
+string2 get_string2() {
+ string2 result;
+ result.i = 5;
+ some_function(result.i);
+ // Test that the debugger can get the value of result after another
+ // function is called.
+ // DEBUGGER: break 35
+ return result;
+}
+int main() {
+ get_string();
+ get_string2();
+}
// DEBUGGER: r
// DEBUGGER: print result.i
// CHECK: = 3
+// DEBUGGER: c
+// DEBUGGER: print result.i
+// CHECK: = 5
--- /dev/null
+// This ensures that DW_OP_deref is inserted when necessary, such as when NRVO
+// of a string object occurs in C++.
+//
+// RUN: %clang_cl %s -o %t.exe -fuse-ld=lld -Z7
+// RUN: grep DE[B]UGGER: %s | sed -e 's/.*DE[B]UGGER: //' > %t.script
+// RUN: %cdb -cf %t.script %t.exe | FileCheck %s --check-prefixes=DEBUGGER,CHECK
+//
+
+struct string {
+ string() {}
+ string(int i) : i(i) {}
+ ~string() {}
+ int i = 0;
+};
+string get_string() {
+ string unused;
+ string result = 3;
+ __debugbreak();
+ return result;
+}
+void some_function(int) {}
+struct string2 {
+ string2() = default;
+ string2(string2 &&other) { i = other.i; }
+ int i;
+};
+string2 get_string2() {
+ string2 result;
+ result.i = 5;
+ some_function(result.i);
+ // Test that the debugger can get the value of result after another
+ // function is called.
+ __debugbreak();
+ return result;
+}
+int main() {
+ get_string();
+ get_string2();
+}
+
+// DEBUGGER: g
+// DEBUGGER: ?? result
+// CHECK: struct string *
+// CHECK: +0x000 i : 0n3
+// DEBUGGER: g
+// DEBUGGER: ?? result
+// CHECK: struct string2 *
+// CHECK: +0x000 i : 0n5
+// DEBUGGER: q
// If the variable has an attached offset expression, extract it.
// FIXME: Try to handle DW_OP_deref as well.
int64_t ExprOffset = 0;
- if (VI.Expr)
- if (!VI.Expr->extractIfOffset(ExprOffset))
+ bool Deref = false;
+ if (VI.Expr) {
+ // If there is one DW_OP_deref element, use offset of 0 and keep going.
+ if (VI.Expr->getNumElements() == 1 &&
+ VI.Expr->getElement(0) == llvm::dwarf::DW_OP_deref)
+ Deref = true;
+ else if (!VI.Expr->extractIfOffset(ExprOffset))
continue;
+ }
// Get the frame register used and the offset.
unsigned FrameReg = 0;
// Calculate the label ranges.
LocalVarDefRange DefRange =
createDefRangeMem(CVReg, FrameOffset + ExprOffset);
+
for (const InsnRange &Range : Scope->getRanges()) {
const MCSymbol *Begin = getLabelBeforeInsn(Range.first);
const MCSymbol *End = getLabelAfterInsn(Range.second);
LocalVariable Var;
Var.DIVar = VI.Var;
Var.DefRanges.emplace_back(std::move(DefRange));
+ if (Deref)
+ Var.UseReferenceType = true;
+
recordLocalVariable(std::move(Var), Scope);
}
}
--- /dev/null
+; RUN: llc < %s | FileCheck %s --check-prefix=ASM
+; RUN: llc < %s -filetype=obj | llvm-readobj - --codeview | FileCheck %s --check-prefix=OBJ
+
+; C++ source to regenerate:
+; struct Foo {
+; Foo() = default;
+; Foo(Foo &&other) { x = other.x; }
+; int x;
+; };
+; void some_function(int);
+; Foo getFoo() {
+; Foo foo;
+; foo.x = 41;
+; some_function(foo.x);
+; return foo;
+; }
+;
+; int main() {
+; Foo bar = getFoo();
+; return bar.x;
+; }
+; $ clang t.cpp -S -emit-llvm -g -o t.ll
+
+; ASM-LABEL: .long 241 # Symbol subsection for GetFoo
+; ASM: .short 4414 # Record kind: S_LOCAL
+; ASM-NEXT: .long 4113 # TypeIndex
+; ASM-NEXT: .short 0 # Flags
+; ASM-NEXT: .asciz "foo"
+; ASM-NEXT: .p2align 2
+; ASM-NEXT: .Ltmp
+; ASM: .cv_def_range .Ltmp{{.*}} .Ltmp{{.*}}, "B\021(\000\000\000"
+
+; OBJ: Subsection [
+; OBJ: SubSectionType: Symbols (0xF1)
+; OBJ: LocalSym {
+; OBJ: Kind: S_LOCAL (0x113E)
+; OBJ: Type: Foo& (0x1011)
+; OBJ: Flags [ (0x0)
+; OBJ: ]
+; OBJ: VarName: foo
+; OBJ: }
+; OBJ: DefRangeFramePointerRelSym {
+; OBJ: Kind: S_DEFRANGE_FRAMEPOINTER_REL (0x1142)
+; OBJ: Offset: 40
+; OBJ: LocalVariableAddrRange {
+; OBJ: OffsetStart: .text+0x1D
+; OBJ: ISectStart: 0x0
+; OBJ: Range: 0x16
+; OBJ: }
+
+; ModuleID = 't.cpp'
+source_filename = "t.cpp"
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc19.16.27030"
+
+%struct.Foo = type { i32 }
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local void @"?some_function@@YAXH@Z"(i32) #0 !dbg !8 {
+entry:
+ %.addr = alloca i32, align 4
+ store i32 %0, i32* %.addr, align 4
+ call void @llvm.dbg.declare(metadata i32* %.addr, metadata !12, metadata !DIExpression()), !dbg !13
+ ret void, !dbg !13
+}
+
+; Function Attrs: nounwind readnone speculatable
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+; Function Attrs: noinline nounwind optnone uwtable
+define dso_local void @"?GetFoo@@YA?AUFoo@@XZ"(%struct.Foo* noalias sret %agg.result) #0 !dbg !14 {
+entry:
+ %result.ptr = alloca i8*, align 8
+ %0 = bitcast %struct.Foo* %agg.result to i8*
+ store i8* %0, i8** %result.ptr, align 8
+ call void @llvm.dbg.declare(metadata i8** %result.ptr, metadata !28, metadata !DIExpression(DW_OP_deref)), !dbg !29
+ %x = getelementptr inbounds %struct.Foo, %struct.Foo* %agg.result, i32 0, i32 0, !dbg !30
+ store i32 41, i32* %x, align 4, !dbg !30
+ %x1 = getelementptr inbounds %struct.Foo, %struct.Foo* %agg.result, i32 0, i32 0, !dbg !31
+ %1 = load i32, i32* %x1, align 4, !dbg !31
+ call void @"?some_function@@YAXH@Z"(i32 %1), !dbg !31
+ ret void, !dbg !32
+}
+
+; Function Attrs: noinline norecurse nounwind optnone uwtable
+define dso_local i32 @main() #2 !dbg !33 {
+entry:
+ %retval = alloca i32, align 4
+ %bar = alloca %struct.Foo, align 4
+ store i32 0, i32* %retval, align 4
+ call void @llvm.dbg.declare(metadata %struct.Foo* %bar, metadata !36, metadata !DIExpression()), !dbg !37
+ call void @"?GetFoo@@YA?AUFoo@@XZ"(%struct.Foo* sret %bar), !dbg !37
+ %x = getelementptr inbounds %struct.Foo, %struct.Foo* %bar, i32 0, i32 0, !dbg !38
+ %0 = load i32, i32* %x, align 4, !dbg !38
+ ret i32 %0, !dbg !38
+}
+
+attributes #0 = { noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind readnone speculatable }
+attributes #2 = { noinline norecurse nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5, !6}
+!llvm.ident = !{!7}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 9.0.0 (https://github.com/llvm/llvm-project.git c19ebebac4bf853e77a69c74abe9f7fce98c1d17)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "t.cpp", directory: "C:\5Csrc\5Ctesting\5Cnrvo", checksumkind: CSK_MD5, checksum: "52a5a20c02c102dfd255d5615680a8bd")
+!2 = !{}
+!3 = !{i32 2, !"CodeView", i32 1}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 2}
+!6 = !{i32 7, !"PIC Level", i32 2}
+!7 = !{!"clang version 9.0.0 (https://github.com/llvm/llvm-project.git c19ebebac4bf853e77a69c74abe9f7fce98c1d17)"}
+!8 = distinct !DISubprogram(name: "some_function", linkageName: "?some_function@@YAXH@Z", scope: !1, file: !1, line: 13, type: !9, scopeLine: 13, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
+!9 = !DISubroutineType(types: !10)
+!10 = !{null, !11}
+!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!12 = !DILocalVariable(arg: 1, scope: !8, file: !1, line: 13, type: !11)
+!13 = !DILocation(line: 13, scope: !8)
+!14 = distinct !DISubprogram(name: "GetFoo", linkageName: "?GetFoo@@YA?AUFoo@@XZ", scope: !1, file: !1, line: 15, type: !15, scopeLine: 15, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
+!15 = !DISubroutineType(types: !16)
+!16 = !{!17}
+!17 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo", file: !1, line: 1, size: 32, flags: DIFlagTypePassByReference | DIFlagNonTrivial, elements: !18, identifier: ".?AUFoo@@")
+!18 = !{!19, !20, !24}
+!19 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !17, file: !1, line: 4, baseType: !11, size: 32)
+!20 = !DISubprogram(name: "Foo", scope: !17, file: !1, line: 2, type: !21, scopeLine: 2, flags: DIFlagPrototyped, spFlags: 0)
+!21 = !DISubroutineType(types: !22)
+!22 = !{null, !23}
+!23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !17, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!24 = !DISubprogram(name: "Foo", scope: !17, file: !1, line: 3, type: !25, scopeLine: 3, flags: DIFlagPrototyped, spFlags: 0)
+!25 = !DISubroutineType(types: !26)
+!26 = !{null, !23, !27}
+!27 = !DIDerivedType(tag: DW_TAG_rvalue_reference_type, baseType: !17, size: 64)
+!28 = !DILocalVariable(name: "foo", scope: !14, file: !1, line: 17, type: !17)
+!29 = !DILocation(line: 17, scope: !14)
+!30 = !DILocation(line: 18, scope: !14)
+!31 = !DILocation(line: 19, scope: !14)
+!32 = !DILocation(line: 21, scope: !14)
+!33 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 23, type: !34, scopeLine: 23, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
+!34 = !DISubroutineType(types: !35)
+!35 = !{!11}
+!36 = !DILocalVariable(name: "bar", scope: !33, file: !1, line: 24, type: !17)
+!37 = !DILocation(line: 24, scope: !33)
+!38 = !DILocation(line: 25, scope: !33)
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