maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Store a pointer to the return value in a static alloca and let the debugger use that 

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
This commit is contained in:
Amy Huang 2019-06-20 17:15:21 +00:00
parent 01511192b2
commit 7fac5c8d94
14 changed files with 306 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
clang/lib/CodeGen/CGDebugInfo.cpp
View File

@ -3835,7 +3835,8 @@ CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
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>())
@ -3940,6 +3941,16 @@ llvm::DILocalVariable *CGDebugInfo::EmitDeclare(const VarDecl *VD,
}
}
// 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,
@ -3958,9 +3969,10 @@ llvm::DILocalVariable *CGDebugInfo::EmitDeclare(const VarDecl *VD,
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) {

10
clang/lib/CodeGen/CGDebugInfo.h
View File

@ -422,9 +422,10 @@ public:
/// 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);
@ -507,7 +508,8 @@ private:
/// 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.

15
clang/lib/CodeGen/CGDecl.cpp
View File

@ -1403,12 +1403,11 @@ CodeGenFunction::EmitAutoVarAlloca(const VarDecl &D) {
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.
//
@ -1561,8 +1560,16 @@ CodeGenFunction::EmitAutoVarAlloca(const VarDecl &D) {
// 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())

8
clang/lib/CodeGen/CodeGenFunction.cpp
View File

@ -895,6 +895,13 @@ void CodeGenFunction::StartFunction(GlobalDecl GD,
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.
@ -902,6 +909,7 @@ void CodeGenFunction::StartFunction(GlobalDecl GD,
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 {

4
clang/lib/CodeGen/CodeGenFunction.h
View File

@ -327,6 +327,10 @@ public:
/// 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)

4
clang/test/CodeGen/arm64-microsoft-arguments.cpp
View File

@ -43,7 +43,7 @@ S3 f3() {
// 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();
@ -57,7 +57,7 @@ S4 f4() {
// 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:

8
clang/test/CodeGenCXX/conditional-gnu-ext.cpp
View File

@ -79,7 +79,7 @@ namespace test3 {
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]]
@ -94,7 +94,7 @@ namespace test3 {
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]])
@ -111,7 +111,7 @@ namespace test3 {
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]]
@ -126,7 +126,7 @@ namespace test3 {
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]])

28
clang/test/CodeGenCXX/debug-info-nrvo.cpp Normal file
View File

@ -0,0 +1,28 @@
// 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()

1
clang/test/CodeGenCXX/lambda-expressions.cpp
View File

@ -195,7 +195,6 @@ namespace pr28595 {
// 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(); };

1
clang/test/CodeGenObjC/objc-non-trivial-struct-nrvo.m
View File

@ -38,7 +38,6 @@ Trivial testTrivial(void) {
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

25
debuginfo-tests/nrvo-string.cpp
View File

@ -17,11 +17,32 @@ struct string {
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

49
debuginfo-tests/win_cdb/nrvo.cpp Normal file
View File

@ -0,0 +1,49 @@
// 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

14
llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
View File

@ -1142,9 +1142,15 @@ void CodeViewDebug::collectVariableInfoFromMFTable(
// 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;
@ -1154,6 +1160,7 @@ void CodeViewDebug::collectVariableInfoFromMFTable(
// 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);
@ -1164,6 +1171,9 @@ void CodeViewDebug::collectVariableInfoFromMFTable(
LocalVariable Var;
Var.DIVar = VI.Var;
Var.DefRanges.emplace_back(std::move(DefRange));
if (Deref)
Var.UseReferenceType = true;
recordLocalVariable(std::move(Var), Scope);
}
}

144
llvm/test/DebugInfo/COFF/nrvo.ll Normal file
View File

@ -0,0 +1,144 @@
; 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)