[llvm] r313400 - [DebugInfo] Insert DW_OP_deref when spilling indirect DBG_VALUEs
Reid Kleckner via llvm-commits
llvm-commits at lists.llvm.org
Fri Sep 15 14:54:38 PDT 2017
Author: rnk
Date: Fri Sep 15 14:54:38 2017
New Revision: 313400
URL: http://llvm.org/viewvc/llvm-project?rev=313400&view=rev
Log:
[DebugInfo] Insert DW_OP_deref when spilling indirect DBG_VALUEs
Summary:
This comes up in optimized debug info for C++ programs that pass and
return objects indirectly by address. In these programs,
llvm.dbg.declare survives optimization, which causes us to emit indirect
DBG_VALUE instructions. The fast register allocator knows to insert
DW_OP_deref when spilling indirect DBG_VALUE instructions, but the
LiveDebugVariables did not until this change.
This fixes part of PR34513. I need to look into why this doesn't work at
-O0 and I'll send follow up patches to handle that.
Reviewers: aprantl, dblaikie, probinson
Subscribers: qcolombet, hiraditya, llvm-commits
Differential Revision: https://reviews.llvm.org/D37911
Added:
llvm/trunk/test/DebugInfo/X86/spill-indirect-nrvo.ll
llvm/trunk/test/DebugInfo/X86/spill-nontrivial-param.ll
Modified:
llvm/trunk/lib/CodeGen/LiveDebugVariables.cpp
llvm/trunk/test/DebugInfo/X86/bbjoin.ll
Modified: llvm/trunk/lib/CodeGen/LiveDebugVariables.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveDebugVariables.cpp?rev=313400&r1=313399&r2=313400&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/LiveDebugVariables.cpp (original)
+++ llvm/trunk/lib/CodeGen/LiveDebugVariables.cpp Fri Sep 15 14:54:38 2017
@@ -108,8 +108,8 @@ class LDVImpl;
/// held by the same virtual register. The equivalence class is the transitive
/// closure of that relation.
class UserValue {
- const MDNode *Variable; ///< The debug info variable we are part of.
- const MDNode *Expression; ///< Any complex address expression.
+ const DILocalVariable *Variable; ///< The debug info variable we are part of.
+ const DIExpression *Expression; ///< Any complex address expression.
bool IsIndirect; ///< true if this is a register-indirect+offset value.
DebugLoc dl; ///< The debug location for the variable. This is
///< used by dwarf writer to find lexical scope.
@@ -132,8 +132,9 @@ class UserValue {
void coalesceLocation(unsigned LocNo);
/// insertDebugValue - Insert a DBG_VALUE into MBB at Idx for LocNo.
- void insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx, unsigned LocNo,
- LiveIntervals &LIS, const TargetInstrInfo &TII);
+ void insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx,
+ unsigned LocNo, bool Spilled, LiveIntervals &LIS,
+ const TargetInstrInfo &TII);
/// splitLocation - Replace OldLocNo ranges with NewRegs ranges where NewRegs
/// is live. Returns true if any changes were made.
@@ -142,8 +143,8 @@ class UserValue {
public:
/// UserValue - Create a new UserValue.
- UserValue(const MDNode *var, const MDNode *expr, bool i, DebugLoc L,
- LocMap::Allocator &alloc)
+ UserValue(const DILocalVariable *var, const DIExpression *expr, bool i,
+ DebugLoc L, LocMap::Allocator &alloc)
: Variable(var), Expression(expr), IsIndirect(i), dl(std::move(L)),
leader(this), locInts(alloc) {}
@@ -159,8 +160,8 @@ public:
UserValue *getNext() const { return next; }
/// match - Does this UserValue match the parameters?
- bool match(const MDNode *Var, const MDNode *Expr, const DILocation *IA,
- bool indirect) const {
+ bool match(const DILocalVariable *Var, const DIExpression *Expr,
+ const DILocation *IA, bool indirect) const {
return Var == Variable && Expr == Expression && dl->getInlinedAt() == IA &&
indirect == IsIndirect;
}
@@ -262,12 +263,14 @@ public:
LiveIntervals &LIS);
/// rewriteLocations - Rewrite virtual register locations according to the
- /// provided virtual register map.
- void rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI);
+ /// provided virtual register map. Record which locations were spilled.
+ void rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI,
+ BitVector &SpilledLocations);
/// emitDebugValues - Recreate DBG_VALUE instruction from data structures.
- void emitDebugValues(VirtRegMap *VRM,
- LiveIntervals &LIS, const TargetInstrInfo &TRI);
+ void emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
+ const TargetInstrInfo &TRI,
+ const BitVector &SpilledLocations);
/// getDebugLoc - Return DebugLoc of this UserValue.
DebugLoc getDebugLoc() { return dl;}
@@ -297,11 +300,11 @@ class LDVImpl {
VRMap virtRegToEqClass;
/// Map user variable to eq class leader.
- using UVMap = DenseMap<const MDNode *, UserValue *>;
+ using UVMap = DenseMap<const DILocalVariable *, UserValue *>;
UVMap userVarMap;
/// getUserValue - Find or create a UserValue.
- UserValue *getUserValue(const MDNode *Var, const MDNode *Expr,
+ UserValue *getUserValue(const DILocalVariable *Var, const DIExpression *Expr,
bool IsIndirect, const DebugLoc &DL);
/// lookupVirtReg - Find the EC leader for VirtReg or null.
@@ -454,8 +457,9 @@ void UserValue::mapVirtRegs(LDVImpl *LDV
LDV->mapVirtReg(locations[i].getReg(), this);
}
-UserValue *LDVImpl::getUserValue(const MDNode *Var, const MDNode *Expr,
- bool IsIndirect, const DebugLoc &DL) {
+UserValue *LDVImpl::getUserValue(const DILocalVariable *Var,
+ const DIExpression *Expr, bool IsIndirect,
+ const DebugLoc &DL) {
UserValue *&Leader = userVarMap[Var];
if (Leader) {
UserValue *UV = Leader->getLeader();
@@ -494,11 +498,11 @@ bool LDVImpl::handleDebugValue(MachineIn
}
// Get or create the UserValue for (variable,offset).
- bool IsIndirect = MI.isIndirectDebugValue();
+ bool IsIndirect = MI.getOperand(1).isImm();
if (IsIndirect)
assert(MI.getOperand(1).getImm() == 0 && "DBG_VALUE with nonzero offset");
- const MDNode *Var = MI.getDebugVariable();
- const MDNode *Expr = MI.getDebugExpression();
+ const DILocalVariable *Var = MI.getDebugVariable();
+ const DIExpression *Expr = MI.getDebugExpression();
//here.
UserValue *UV = getUserValue(Var, Expr, IsIndirect, MI.getDebugLoc());
UV->addDef(Idx, MI.getOperand(0));
@@ -971,8 +975,10 @@ splitRegister(unsigned OldReg, ArrayRef<
static_cast<LDVImpl*>(pImpl)->splitRegister(OldReg, NewRegs);
}
-void
-UserValue::rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI) {
+void UserValue::rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI,
+ BitVector &SpilledLocations) {
+ SpilledLocations.resize(locations.size());
+
// Iterate over locations in reverse makes it easier to handle coalescing.
for (unsigned i = locations.size(); i ; --i) {
unsigned LocNo = i-1;
@@ -991,6 +997,7 @@ UserValue::rewriteLocations(VirtRegMap &
} else if (VRM.getStackSlot(VirtReg) != VirtRegMap::NO_STACK_SLOT) {
// FIXME: Translate SubIdx to a stackslot offset.
Loc = MachineOperand::CreateFI(VRM.getStackSlot(VirtReg));
+ SpilledLocations.set(LocNo);
} else {
Loc.setReg(0);
Loc.setSubReg(0);
@@ -1024,7 +1031,7 @@ findInsertLocation(MachineBasicBlock *MB
}
void UserValue::insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx,
- unsigned LocNo,
+ unsigned LocNo, bool Spilled,
LiveIntervals &LIS,
const TargetInstrInfo &TII) {
MachineBasicBlock::iterator I = findInsertLocation(MBB, Idx, LIS);
@@ -1034,25 +1041,35 @@ void UserValue::insertDebugValue(Machine
assert(cast<DILocalVariable>(Variable)
->isValidLocationForIntrinsic(getDebugLoc()) &&
"Expected inlined-at fields to agree");
- if (Loc.isReg())
- BuildMI(*MBB, I, getDebugLoc(), TII.get(TargetOpcode::DBG_VALUE),
- IsIndirect, Loc.getReg(), Variable, Expression);
+
+ // If the location was spilled, the new DBG_VALUE will be indirect. If the
+ // original DBG_VALUE was indirect, we need to add DW_OP_deref to indicate
+ // that the original virtual register was a pointer.
+ bool NewIndirect = IsIndirect || Spilled;
+ const DIExpression *Expr = Expression;
+ if (Spilled && IsIndirect)
+ Expr = DIExpression::prepend(Expr, DIExpression::WithDeref);
+
+ MachineInstrBuilder MIB =
+ BuildMI(*MBB, I, getDebugLoc(), TII.get(TargetOpcode::DBG_VALUE))
+ .add(Loc);
+ if (NewIndirect)
+ MIB.addImm(0U);
else
- BuildMI(*MBB, I, getDebugLoc(), TII.get(TargetOpcode::DBG_VALUE))
- .add(Loc)
- .addImm(0U)
- .addMetadata(Variable)
- .addMetadata(Expression);
+ MIB.addReg(0U, RegState::Debug);
+ MIB.addMetadata(Variable).addMetadata(Expr);
}
void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
- const TargetInstrInfo &TII) {
+ const TargetInstrInfo &TII,
+ const BitVector &SpilledLocations) {
MachineFunction::iterator MFEnd = VRM->getMachineFunction().end();
for (LocMap::const_iterator I = locInts.begin(); I.valid();) {
SlotIndex Start = I.start();
SlotIndex Stop = I.stop();
unsigned LocNo = I.value();
+ bool Spilled = LocNo != ~0U ? SpilledLocations.test(LocNo) : false;
// If the interval start was trimmed to the lexical scope insert the
// DBG_VALUE at the previous index (otherwise it appears after the
@@ -1065,7 +1082,7 @@ void UserValue::emitDebugValues(VirtRegM
SlotIndex MBBEnd = LIS.getMBBEndIdx(&*MBB);
DEBUG(dbgs() << " BB#" << MBB->getNumber() << '-' << MBBEnd);
- insertDebugValue(&*MBB, Start, LocNo, LIS, TII);
+ insertDebugValue(&*MBB, Start, LocNo, Spilled, LIS, TII);
// This interval may span multiple basic blocks.
// Insert a DBG_VALUE into each one.
while(Stop > MBBEnd) {
@@ -1075,7 +1092,7 @@ void UserValue::emitDebugValues(VirtRegM
break;
MBBEnd = LIS.getMBBEndIdx(&*MBB);
DEBUG(dbgs() << " BB#" << MBB->getNumber() << '-' << MBBEnd);
- insertDebugValue(&*MBB, Start, LocNo, LIS, TII);
+ insertDebugValue(&*MBB, Start, LocNo, Spilled, LIS, TII);
}
DEBUG(dbgs() << '\n');
if (MBB == MFEnd)
@@ -1090,10 +1107,11 @@ void LDVImpl::emitDebugValues(VirtRegMap
if (!MF)
return;
const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
+ BitVector SpilledLocations;
for (unsigned i = 0, e = userValues.size(); i != e; ++i) {
DEBUG(userValues[i]->print(dbgs(), TRI));
- userValues[i]->rewriteLocations(*VRM, *TRI);
- userValues[i]->emitDebugValues(VRM, *LIS, *TII);
+ userValues[i]->rewriteLocations(*VRM, *TRI, SpilledLocations);
+ userValues[i]->emitDebugValues(VRM, *LIS, *TII, SpilledLocations);
}
EmitDone = true;
}
Modified: llvm/trunk/test/DebugInfo/X86/bbjoin.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/bbjoin.ll?rev=313400&r1=313399&r2=313400&view=diff
==============================================================================
--- llvm/trunk/test/DebugInfo/X86/bbjoin.ll (original)
+++ llvm/trunk/test/DebugInfo/X86/bbjoin.ll Fri Sep 15 14:54:38 2017
@@ -11,12 +11,12 @@
; }
; CHECK: ![[X:.*]] = !DILocalVariable(name: "x",
; CHECK: bb.0.entry:
-; CHECK: DBG_VALUE 23, 0, ![[X]],
+; CHECK: DBG_VALUE 23, debug-use _, ![[X]],
; CHECK: DBG_VALUE %rsp, 0, ![[X]], !DIExpression(DW_OP_plus_uconst, 4, DW_OP_deref),
; CHECK: bb.1.if.then:
-; CHECK: DBG_VALUE 43, 0, ![[X]],
+; CHECK: DBG_VALUE 43, debug-use _, ![[X]],
; CHECK: bb.2.if.end:
-; CHECK-NOT: DBG_VALUE 23, 0, ![[X]],
+; CHECK-NOT: DBG_VALUE 23, debug-use _, ![[X]],
; CHECK: RETQ %eax
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
Added: llvm/trunk/test/DebugInfo/X86/spill-indirect-nrvo.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/spill-indirect-nrvo.ll?rev=313400&view=auto
==============================================================================
--- llvm/trunk/test/DebugInfo/X86/spill-indirect-nrvo.ll (added)
+++ llvm/trunk/test/DebugInfo/X86/spill-indirect-nrvo.ll Fri Sep 15 14:54:38 2017
@@ -0,0 +1,103 @@
+; RUN: llc < %s | FileCheck %s
+; RUN: llc -O0 < %s | FileCheck %s
+
+; Make sure we insert DW_OP_deref when spilling indirect DBG_VALUE instructions.
+
+; C++ source:
+; #define FORCE_SPILL() \
+; __asm volatile("" : : : \
+; "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp", "r8", \
+; "r9", "r10", "r11", "r12", "r13", "r14", "r15")
+; struct string {
+; string();
+; string(int i);
+; ~string();
+; int i = 0;
+; };
+; string get_string() {
+; string result = 3;
+; FORCE_SPILL();
+; return result;
+; }
+
+; CHECK-LABEL: _Z10get_stringv:
+; CHECK: #DEBUG_VALUE: get_string:result <- [%RDI+0]
+; CHECK: movq %rdi, [[OFFS:[0-9]+]](%rsp) # 8-byte Spill
+; CHECK: #DEBUG_VALUE: get_string:result <- [DW_OP_plus_uconst [[OFFS]], DW_OP_deref] [%RSP+0]
+; CHECK: callq _ZN6stringC1Ei
+; CHECK: #APP
+; CHECK: #NO_APP
+
+; ModuleID = 't.cpp'
+source_filename = "t.cpp"
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64--linux"
+
+%struct.string = type { i32 }
+
+; Function Attrs: uwtable
+define void @_Z10get_stringv(%struct.string* noalias sret %agg.result) #0 !dbg !7 {
+entry:
+ %nrvo = alloca i1, align 1
+ store i1 false, i1* %nrvo, align 1, !dbg !24
+ call void @llvm.dbg.declare(metadata %struct.string* %agg.result, metadata !23, metadata !DIExpression()), !dbg !25
+ call void @_ZN6stringC1Ei(%struct.string* %agg.result, i32 3), !dbg !26
+ call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() #3, !dbg !27, !srcloc !28
+ store i1 true, i1* %nrvo, align 1, !dbg !29
+ %nrvo.val = load i1, i1* %nrvo, align 1, !dbg !30
+ br i1 %nrvo.val, label %nrvo.skipdtor, label %nrvo.unused, !dbg !30
+
+nrvo.unused: ; preds = %entry
+ call void @_ZN6stringD1Ev(%struct.string* %agg.result), !dbg !30
+ br label %nrvo.skipdtor, !dbg !30
+
+nrvo.skipdtor: ; preds = %nrvo.unused, %entry
+ ret void, !dbg !30
+}
+
+; Function Attrs: nounwind readnone speculatable
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+declare void @_ZN6stringC1Ei(%struct.string*, i32) unnamed_addr
+
+declare void @_ZN6stringD1Ev(%struct.string*) unnamed_addr
+
+attributes #0 = { uwtable }
+attributes #1 = { nounwind readnone speculatable }
+attributes #3 = { nounwind }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "t.cpp", directory: "C:\5Csrc\5Cllvm-project\5Cbuild")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 6.0.0 "}
+!7 = distinct !DISubprogram(name: "get_string", linkageName: "_Z10get_stringv", scope: !1, file: !1, line: 13, type: !8, isLocal: false, isDefinition: true, scopeLine: 13, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !22)
+!8 = !DISubroutineType(types: !9)
+!9 = !{!10}
+!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "string", file: !1, line: 7, size: 32, elements: !11, identifier: "_ZTS6string")
+!11 = !{!12, !14, !18, !21}
+!12 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !10, file: !1, line: 11, baseType: !13, size: 32)
+!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!14 = !DISubprogram(name: "string", scope: !10, file: !1, line: 8, type: !15, isLocal: false, isDefinition: false, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true)
+!15 = !DISubroutineType(types: !16)
+!16 = !{null, !17}
+!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!18 = !DISubprogram(name: "string", scope: !10, file: !1, line: 9, type: !19, isLocal: false, isDefinition: false, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: true)
+!19 = !DISubroutineType(types: !20)
+!20 = !{null, !17, !13}
+!21 = !DISubprogram(name: "~string", scope: !10, file: !1, line: 10, type: !15, isLocal: false, isDefinition: false, scopeLine: 10, flags: DIFlagPrototyped, isOptimized: true)
+!22 = !{!23}
+!23 = !DILocalVariable(name: "result", scope: !7, file: !1, line: 14, type: !10)
+!24 = !DILocation(line: 14, column: 3, scope: !7)
+!25 = !DILocation(line: 14, column: 10, scope: !7)
+!26 = !DILocation(line: 14, column: 19, scope: !7)
+!27 = !DILocation(line: 15, column: 3, scope: !7)
+!28 = !{i32 -2147471175}
+!29 = !DILocation(line: 16, column: 3, scope: !7)
+!30 = !DILocation(line: 17, column: 1, scope: !7)
Added: llvm/trunk/test/DebugInfo/X86/spill-nontrivial-param.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/X86/spill-nontrivial-param.ll?rev=313400&view=auto
==============================================================================
--- llvm/trunk/test/DebugInfo/X86/spill-nontrivial-param.ll (added)
+++ llvm/trunk/test/DebugInfo/X86/spill-nontrivial-param.ll Fri Sep 15 14:54:38 2017
@@ -0,0 +1,89 @@
+; RUN: llc < %s | FileCheck %s
+
+; Make sure we insert DW_OP_deref when spilling indirect DBG_VALUE instructions.
+; In this example, 'nt' is passed by address because it is not trivially
+; copyable. When we spill the physical argument register at the barrier, we need
+; to insert DW_OP_deref.
+
+; #define FORCE_SPILL() \
+; __asm volatile("" : : : \
+; "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp", "r8", \
+; "r9", "r10", "r11", "r12", "r13", "r14", "r15")
+; struct NonTrivial {
+; NonTrivial();
+; ~NonTrivial();
+; int i;
+; };
+; int foo(NonTrivial nt) {
+; FORCE_SPILL();
+; return nt.i;
+; }
+
+; CHECK-LABEL: _Z3foo10NonTrivial:
+; CHECK: #DEBUG_VALUE: foo:nt <- [%RDI+0]
+; CHECK: movq %rdi, -8(%rsp) # 8-byte Spill
+; CHECK: #DEBUG_VALUE: foo:nt <- [DW_OP_constu 8, DW_OP_minus, DW_OP_deref] [%RSP+0]
+; CHECK: #APP
+; CHECK: #NO_APP
+; CHECK: movq -8(%rsp), %rax # 8-byte Reload
+; CHECK: movl (%rax), %eax
+
+; ModuleID = 't.cpp'
+source_filename = "t.cpp"
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64--linux"
+
+%struct.NonTrivial = type { i32 }
+
+; Function Attrs: nounwind uwtable
+define i32 @_Z3foo10NonTrivial(%struct.NonTrivial* nocapture readonly %nt) local_unnamed_addr #0 !dbg !7 {
+entry:
+ tail call void @llvm.dbg.declare(metadata %struct.NonTrivial* %nt, metadata !20, metadata !DIExpression()), !dbg !21
+ tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() #2, !dbg !22, !srcloc !23
+ %i = getelementptr inbounds %struct.NonTrivial, %struct.NonTrivial* %nt, i64 0, i32 0, !dbg !24
+ %0 = load i32, i32* %i, align 4, !dbg !24, !tbaa !25
+ ret i32 %0, !dbg !30
+}
+
+; Function Attrs: nounwind readnone speculatable
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind uwtable }
+attributes #1 = { nounwind readnone speculatable }
+attributes #2 = { nounwind }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "t.cpp", directory: "C:\5Csrc\5Cllvm-project\5Cbuild")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 6.0.0 "}
+!7 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foo10NonTrivial", scope: !1, file: !1, line: 10, type: !8, isLocal: false, isDefinition: true, scopeLine: 10, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !19)
+!8 = !DISubroutineType(types: !9)
+!9 = !{!10, !11}
+!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "NonTrivial", file: !1, line: 5, size: 32, elements: !12, identifier: "_ZTS10NonTrivial")
+!12 = !{!13, !14, !18}
+!13 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !11, file: !1, line: 8, baseType: !10, size: 32)
+!14 = !DISubprogram(name: "NonTrivial", scope: !11, file: !1, line: 6, type: !15, isLocal: false, isDefinition: false, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true)
+!15 = !DISubroutineType(types: !16)
+!16 = !{null, !17}
+!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
+!18 = !DISubprogram(name: "~NonTrivial", scope: !11, file: !1, line: 7, type: !15, isLocal: false, isDefinition: false, scopeLine: 7, flags: DIFlagPrototyped, isOptimized: true)
+!19 = !{!20}
+!20 = !DILocalVariable(name: "nt", arg: 1, scope: !7, file: !1, line: 10, type: !11)
+!21 = !DILocation(line: 10, column: 20, scope: !7)
+!22 = !DILocation(line: 11, column: 3, scope: !7)
+!23 = !{i32 -2147471481}
+!24 = !DILocation(line: 12, column: 13, scope: !7)
+!25 = !{!26, !27, i64 0}
+!26 = !{!"_ZTS10NonTrivial", !27, i64 0}
+!27 = !{!"int", !28, i64 0}
+!28 = !{!"omnipotent char", !29, i64 0}
+!29 = !{!"Simple C++ TBAA"}
+!30 = !DILocation(line: 12, column: 3, scope: !7)
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