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[DebugInfo][InstrRef][X86] Instrument expanded DYN_ALLOCAs
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If we have a DYN_ALLOCA_* instruction, it will eventually be expanded to a
stack probe and subtract-from-SP. Add debug-info instrumentation to
X86FrameLowering::emitStackProbe so that it can redirect debug-info for the
DYN_ALLOCA to the lowered stack probe. In practice, this means putting an
instruction number label either the call instruction to _chkstk for win32,
or more commonly on the subtract from SP instruction. The two tests added
cover both of these cases.

Differential Revision: https://reviews.llvm.org/D114452
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@jmorse
jmorse committed Nov 30, 2021
1 parent 14c4051 commit 7093c81
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Showing 5 changed files with 282 additions and 20 deletions.
8 changes: 7 additions & 1 deletion llvm/lib/Target/X86/X86DynAllocaExpander.cpp
View file
Expand Up @@ -212,6 +212,12 @@ void X86DynAllocaExpander::lower(MachineInstr *MI, Lowering L) {
bool Is64BitAlloca = MI->getOpcode() == X86::DYN_ALLOCA_64;
assert(SlotSize == 4 || SlotSize == 8);

Optional<MachineFunction::DebugInstrOperandPair> InstrNum = None;
if (unsigned Num = MI->peekDebugInstrNum()) {
// Operand 2 of DYN_ALLOCAs contains the stack def.
InstrNum = {Num, 2};
}

switch (L) {
case TouchAndSub: {
assert(Amount >= SlotSize);
Expand Down Expand Up @@ -251,7 +257,7 @@ void X86DynAllocaExpander::lower(MachineInstr *MI, Lowering L) {

// Do the probe.
STI->getFrameLowering()->emitStackProbe(*MBB->getParent(), *MBB, MI, DL,
/*InProlog=*/false);
/*InProlog=*/false, InstrNum);
} else {
// Sub
BuildMI(*MBB, I, DL,
Expand Down
44 changes: 31 additions & 13 deletions llvm/lib/Target/X86/X86FrameLowering.cpp
View file
Expand Up @@ -482,10 +482,10 @@ void X86FrameLowering::emitCalleeSavedFrameMoves(
}
}

void X86FrameLowering::emitStackProbe(MachineFunction &MF,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI,
const DebugLoc &DL, bool InProlog) const {
void X86FrameLowering::emitStackProbe(
MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI, const DebugLoc &DL, bool InProlog,
Optional<MachineFunction::DebugInstrOperandPair> InstrNum) const {
const X86Subtarget &STI = MF.getSubtarget<X86Subtarget>();
if (STI.isTargetWindowsCoreCLR()) {
if (InProlog) {
Expand All @@ -495,7 +495,7 @@ void X86FrameLowering::emitStackProbe(MachineFunction &MF,
emitStackProbeInline(MF, MBB, MBBI, DL, false);
}
} else {
emitStackProbeCall(MF, MBB, MBBI, DL, InProlog);
emitStackProbeCall(MF, MBB, MBBI, DL, InProlog, InstrNum);
}
}

Expand Down Expand Up @@ -973,11 +973,10 @@ void X86FrameLowering::emitStackProbeInlineWindowsCoreCLR64(
}
}

void X86FrameLowering::emitStackProbeCall(MachineFunction &MF,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI,
const DebugLoc &DL,
bool InProlog) const {
void X86FrameLowering::emitStackProbeCall(
MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI, const DebugLoc &DL, bool InProlog,
Optional<MachineFunction::DebugInstrOperandPair> InstrNum) const {
bool IsLargeCodeModel = MF.getTarget().getCodeModel() == CodeModel::Large;

// FIXME: Add indirect thunk support and remove this.
Expand Down Expand Up @@ -1017,16 +1016,35 @@ void X86FrameLowering::emitStackProbeCall(MachineFunction &MF,
.addReg(SP, RegState::Define | RegState::Implicit)
.addReg(X86::EFLAGS, RegState::Define | RegState::Implicit);

MachineInstr *ModInst = CI;
if (STI.isTargetWin64() || !STI.isOSWindows()) {
// MSVC x32's _chkstk and cygwin/mingw's _alloca adjust %esp themselves.
// MSVC x64's __chkstk and cygwin/mingw's ___chkstk_ms do not adjust %rsp
// themselves. They also does not clobber %rax so we can reuse it when
// adjusting %rsp.
// All other platforms do not specify a particular ABI for the stack probe
// function, so we arbitrarily define it to not adjust %esp/%rsp itself.
BuildMI(MBB, MBBI, DL, TII.get(getSUBrrOpcode(Uses64BitFramePtr)), SP)
.addReg(SP)
.addReg(AX);
ModInst =
BuildMI(MBB, MBBI, DL, TII.get(getSUBrrOpcode(Uses64BitFramePtr)), SP)
.addReg(SP)
.addReg(AX);
}

// DebugInfo variable locations -- if there's an instruction number for the
// allocation (i.e., DYN_ALLOC_*), substitute it for the instruction that
// modifies SP.
if (InstrNum) {
if (STI.isTargetWin64() || !STI.isOSWindows()) {
// Label destination operand of the subtract.
MF.makeDebugValueSubstitution(*InstrNum,
{ModInst->getDebugInstrNum(), 0});
} else {
// Label the call. The operand number is the penultimate operand, zero
// based.
unsigned SPDefOperand = ModInst->getNumOperands() - 2;
MF.makeDebugValueSubstitution(
*InstrNum, {ModInst->getDebugInstrNum(), SPDefOperand});
}
}

if (InProlog) {
Expand Down
17 changes: 11 additions & 6 deletions llvm/lib/Target/X86/X86FrameLowering.h
View file
Expand Up @@ -13,6 +13,7 @@
#ifndef LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
#define LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H

#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/TargetFrameLowering.h"
#include "llvm/Support/TypeSize.h"

Expand Down Expand Up @@ -51,9 +52,12 @@ class X86FrameLowering : public TargetFrameLowering {
/// Emit target stack probe code. This is required for all
/// large stack allocations on Windows. The caller is required to materialize
/// the number of bytes to probe in RAX/EAX.
void emitStackProbe(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI, const DebugLoc &DL,
bool InProlog) const;
/// \p InstrNum optionally contains a debug-info instruction number for the
/// new stack pointer.
void emitStackProbe(
MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI, const DebugLoc &DL, bool InProlog,
Optional<MachineFunction::DebugInstrOperandPair> InstrNum = None) const;

bool stackProbeFunctionModifiesSP() const override;

Expand Down Expand Up @@ -200,9 +204,10 @@ class X86FrameLowering : public TargetFrameLowering {
uint64_t calculateMaxStackAlign(const MachineFunction &MF) const;

/// Emit target stack probe as a call to a helper function
void emitStackProbeCall(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI, const DebugLoc &DL,
bool InProlog) const;
void emitStackProbeCall(
MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI, const DebugLoc &DL, bool InProlog,
Optional<MachineFunction::DebugInstrOperandPair> InstrNum) const;

/// Emit target stack probe as an inline sequence.
void emitStackProbeInline(MachineFunction &MF, MachineBasicBlock &MBB,
Expand Down
123 changes: 123 additions & 0 deletions llvm/test/DebugInfo/X86/instr-ref-dyn-alloca-win32.ll
View file
@@ -0,0 +1,123 @@
; RUN: llc %s -o - -stop-after=machine-sink \
; RUN: -experimental-debug-variable-locations=true \
; RUN: | FileCheck %s --check-prefixes=DYN_LABEL
; RUN: llc %s -o - -stop-before=phi-node-elimination \
; RUN: -experimental-debug-variable-locations=true \
; RUN: | FileCheck %s --check-prefixes=DYN_LOWERED

;; This is a copy of DebugInfo/COFF/types-array-advanced.ll, checking that
;; DYN_ALLOCAs correctly have instruction references updated. This is compiled
;; from LLVM-IR because the "hasDynAlloca" flag isn't serialised to MIR, for
;; complicated reasons, that means we can't store as MIR.

;; The alloca instruction should be labelled, and we should refer to operand 2,
;; which happens to be a def of $esp
; DYN_LABEL: DYN_ALLOCA_32 {{.*}} debug-instr-number 1,
; DYN_LABEL: DBG_INSTR_REF 1, 2

;; Once lowered, on win32 _chkstk alters the stack pointer. We should label the
;; call and it's SP operand, plus check for a value substitution.
; DYN_LOWERED: debugValueSubstitutions:
; DYN_LOWERED-NEXT: - { srcinst: 1, srcop: 2, dstinst: 2, dstop: 6, subreg: 0 }
;; Test that it's operand six, and labelled.
; DYN_LOWERED: CALLpcrel32 &_chkstk, implicit $esp, implicit $ssp,
; DYN_LOWERED-SAME: implicit killed $eax, implicit $esp, implicit-def dead $eax,
; DYN_LOWERED-SAME: implicit-def $esp, implicit-def dead $eflags,
; DYN_LOWERED-SAME: debug-instr-number 2,

source_filename = "test/DebugInfo/COFF/types-array-advanced.ll"
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i686-pc-windows-msvc18.0.31101"

%struct.incomplete_struct = type { i32 }

@"\01?multi_dim_arr@@3PAY146DA" = global [2 x [5 x [7 x i8]]] zeroinitializer, align 1, !dbg !0
@"\01?p_incomplete_struct_arr@@3PAY02Uincomplete_struct@@A" = global [3 x i8]* null, align 4, !dbg !6
@"\01?incomplete_struct_arr@@3PAUincomplete_struct@@A" = global [3 x %struct.incomplete_struct] zeroinitializer, align 4, !dbg !16
@"\01?typedef_arr@@3SDHD" = constant [4 x i32] zeroinitializer, align 4, !dbg !18

; Function Attrs: nounwind
define void @"\01?foo@@YAXH@Z"(i32 %x) #0 !dbg !35 {
entry:
%x.addr = alloca i32, align 4
%saved_stack = alloca i8*, align 4
store i32 %x, i32* %x.addr, align 4
call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !38, metadata !39), !dbg !40
%0 = load i32, i32* %x.addr, align 4, !dbg !41
%1 = call i8* @llvm.stacksave(), !dbg !42
store i8* %1, i8** %saved_stack, align 4, !dbg !42
%vla = alloca i32, i32 %0, align 4, !dbg !42
call void @llvm.dbg.declare(metadata i32* %vla, metadata !43, metadata !47), !dbg !48
%arrayidx = getelementptr inbounds i32, i32* %vla, i32 0, !dbg !49
store i32 0, i32* %arrayidx, align 4, !dbg !50
%2 = load i8*, i8** %saved_stack, align 4, !dbg !51
call void @llvm.stackrestore(i8* %2), !dbg !51
ret void, !dbg !51
}

; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata)

; Function Attrs: nounwind
declare i8* @llvm.stacksave()

; Function Attrs: nounwind
declare void @llvm.stackrestore(i8*)

!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!32, !33}
!llvm.ident = !{!34}

!0 = distinct !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = !DIGlobalVariable(name: "multi_dim_arr", linkageName: "\01?multi_dim_arr@@3PAY146DA", scope: !2, file: !3, line: 1, type: !26, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 3.9.0 (trunk 273874)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
!3 = !DIFile(filename: "t.cpp", directory: "/")
!4 = !{}
!5 = !{!0, !6, !16, !18}
!6 = distinct !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
!7 = !DIGlobalVariable(name: "p_incomplete_struct_arr", linkageName: "\01?p_incomplete_struct_arr@@3PAY02Uincomplete_struct@@A", scope: !2, file: !3, line: 3, type: !8, isLocal: false, isDefinition: true)
!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 32, align: 32)
!9 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, elements: !14)
!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "incomplete_struct", file: !3, line: 4, size: 32, align: 32, elements: !11, identifier: ".?AUincomplete_struct@@")
!11 = !{!12}
!12 = !DIDerivedType(tag: DW_TAG_member, name: "s1", scope: !10, file: !3, line: 5, baseType: !13, size: 32, align: 32)
!13 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!14 = !{!15}
!15 = !DISubrange(count: 3)
!16 = distinct !DIGlobalVariableExpression(var: !17, expr: !DIExpression())
!17 = !DIGlobalVariable(name: "incomplete_struct_arr", linkageName: "\01?incomplete_struct_arr@@3PAUincomplete_struct@@A", scope: !2, file: !3, line: 6, type: !9, isLocal: false, isDefinition: true)
!18 = distinct !DIGlobalVariableExpression(var: !19, expr: !DIExpression())
!19 = !DIGlobalVariable(name: "typedef_arr", linkageName: "\01?typedef_arr@@3SDHD", scope: !2, file: !3, line: 14, type: !20, isLocal: false, isDefinition: true)
!20 = !DICompositeType(tag: DW_TAG_array_type, baseType: !21, size: 128, align: 32, elements: !24)
!21 = !DIDerivedType(tag: DW_TAG_typedef, name: "T_INT", file: !3, line: 13, baseType: !22)
!22 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !23)
!23 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !13)
!24 = !{!25}
!25 = !DISubrange(count: 4)
!26 = !DICompositeType(tag: DW_TAG_array_type, baseType: !27, size: 560, align: 8, elements: !28)
!27 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
!28 = !{!29, !30, !31}
!29 = !DISubrange(count: 2)
!30 = !DISubrange(count: 5)
!31 = !DISubrange(count: 7)
!32 = !{i32 2, !"CodeView", i32 1}
!33 = !{i32 2, !"Debug Info Version", i32 3}
!34 = !{!"clang version 3.9.0 (trunk 273874)"}
!35 = distinct !DISubprogram(name: "foo", linkageName: "\01?foo@@YAXH@Z", scope: !3, file: !3, line: 8, type: !36, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !2, retainedNodes: !4)
!36 = !DISubroutineType(types: !37)
!37 = !{null, !13}
!38 = !DILocalVariable(name: "x", arg: 1, scope: !35, file: !3, line: 8, type: !13)
!39 = !DIExpression()
!40 = !DILocation(line: 8, column: 14, scope: !35)
!41 = !DILocation(line: 9, column: 21, scope: !35)
!42 = !DILocation(line: 9, column: 4, scope: !35)
!43 = !DILocalVariable(name: "dyn_size_arr", scope: !35, file: !3, line: 9, type: !44)
!44 = !DICompositeType(tag: DW_TAG_array_type, baseType: !13, align: 32, elements: !45)
!45 = !{!46}
!46 = !DISubrange(count: -1)
!47 = !DIExpression(DW_OP_deref)
!48 = !DILocation(line: 9, column: 8, scope: !35)
!49 = !DILocation(line: 10, column: 4, scope: !35)
!50 = !DILocation(line: 10, column: 20, scope: !35)
!51 = !DILocation(line: 11, column: 1, scope: !35)

110 changes: 110 additions & 0 deletions llvm/test/DebugInfo/X86/instr-ref-dyn-alloca.ll
View file
@@ -0,0 +1,110 @@
; RUN: llc %s -o - -stop-before=phi-node-elimination \
; RUN: -experimental-debug-variable-locations=true \
; RUN: | FileCheck %s --check-prefixes=DYN_LOWERED

;; Copy of instr-ref-dyn-alloca-win32.ll, targetting 64 bit Windows. Here,
;; _chkstk doesn't return with a modified stack pointer, instead we have to
;; edit it with our own subtract operation. Check that it's labelled and the
;; substitution is correct. This also covers the code paths for non-Windows on
;; x86.

; DYN_LOWERED: debugValueSubstitutions:
; DYN_LOWERED-NEXT: - { srcinst: 1, srcop: 2, dstinst: 2, dstop: 0, subreg: 0 }
; DYN_LOWERED: SUB64rr $rsp, killed $rax, {{.*}} debug-instr-number 2,

source_filename = "test/DebugInfo/COFF/types-array-advanced.ll"
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc19.0.24210"

%struct.incomplete_struct = type { i32 }

@"\01?multi_dim_arr@@3PAY146DA" = global [2 x [5 x [7 x i8]]] zeroinitializer, align 1, !dbg !0
@"\01?p_incomplete_struct_arr@@3PAY02Uincomplete_struct@@A" = global [3 x i8]* null, align 4, !dbg !6
@"\01?incomplete_struct_arr@@3PAUincomplete_struct@@A" = global [3 x %struct.incomplete_struct] zeroinitializer, align 4, !dbg !16
@"\01?typedef_arr@@3SDHD" = constant [4 x i32] zeroinitializer, align 4, !dbg !18

; Function Attrs: nounwind
define void @"\01?foo@@YAXH@Z"(i32 %x) #0 !dbg !35 {
entry:
%x.addr = alloca i32, align 4
%saved_stack = alloca i8*, align 4
store i32 %x, i32* %x.addr, align 4
call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !38, metadata !39), !dbg !40
%0 = load i32, i32* %x.addr, align 4, !dbg !41
%1 = call i8* @llvm.stacksave(), !dbg !42
store i8* %1, i8** %saved_stack, align 4, !dbg !42
%vla = alloca i32, i32 %0, align 4, !dbg !42
call void @llvm.dbg.declare(metadata i32* %vla, metadata !43, metadata !47), !dbg !48
%arrayidx = getelementptr inbounds i32, i32* %vla, i32 0, !dbg !49
store i32 0, i32* %arrayidx, align 4, !dbg !50
%2 = load i8*, i8** %saved_stack, align 4, !dbg !51
call void @llvm.stackrestore(i8* %2), !dbg !51
ret void, !dbg !51
}

; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata)

; Function Attrs: nounwind
declare i8* @llvm.stacksave()

; Function Attrs: nounwind
declare void @llvm.stackrestore(i8*)

!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!32, !33}
!llvm.ident = !{!34}

!0 = distinct !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = !DIGlobalVariable(name: "multi_dim_arr", linkageName: "\01?multi_dim_arr@@3PAY146DA", scope: !2, file: !3, line: 1, type: !26, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 3.9.0 (trunk 273874)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
!3 = !DIFile(filename: "t.cpp", directory: "/")
!4 = !{}
!5 = !{!0, !6, !16, !18}
!6 = distinct !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
!7 = !DIGlobalVariable(name: "p_incomplete_struct_arr", linkageName: "\01?p_incomplete_struct_arr@@3PAY02Uincomplete_struct@@A", scope: !2, file: !3, line: 3, type: !8, isLocal: false, isDefinition: true)
!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 32, align: 32)
!9 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, elements: !14)
!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "incomplete_struct", file: !3, line: 4, size: 32, align: 32, elements: !11, identifier: ".?AUincomplete_struct@@")
!11 = !{!12}
!12 = !DIDerivedType(tag: DW_TAG_member, name: "s1", scope: !10, file: !3, line: 5, baseType: !13, size: 32, align: 32)
!13 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!14 = !{!15}
!15 = !DISubrange(count: 3)
!16 = distinct !DIGlobalVariableExpression(var: !17, expr: !DIExpression())
!17 = !DIGlobalVariable(name: "incomplete_struct_arr", linkageName: "\01?incomplete_struct_arr@@3PAUincomplete_struct@@A", scope: !2, file: !3, line: 6, type: !9, isLocal: false, isDefinition: true)
!18 = distinct !DIGlobalVariableExpression(var: !19, expr: !DIExpression())
!19 = !DIGlobalVariable(name: "typedef_arr", linkageName: "\01?typedef_arr@@3SDHD", scope: !2, file: !3, line: 14, type: !20, isLocal: false, isDefinition: true)
!20 = !DICompositeType(tag: DW_TAG_array_type, baseType: !21, size: 128, align: 32, elements: !24)
!21 = !DIDerivedType(tag: DW_TAG_typedef, name: "T_INT", file: !3, line: 13, baseType: !22)
!22 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !23)
!23 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !13)
!24 = !{!25}
!25 = !DISubrange(count: 4)
!26 = !DICompositeType(tag: DW_TAG_array_type, baseType: !27, size: 560, align: 8, elements: !28)
!27 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
!28 = !{!29, !30, !31}
!29 = !DISubrange(count: 2)
!30 = !DISubrange(count: 5)
!31 = !DISubrange(count: 7)
!32 = !{i32 2, !"CodeView", i32 1}
!33 = !{i32 2, !"Debug Info Version", i32 3}
!34 = !{!"clang version 3.9.0 (trunk 273874)"}
!35 = distinct !DISubprogram(name: "foo", linkageName: "\01?foo@@YAXH@Z", scope: !3, file: !3, line: 8, type: !36, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !2, retainedNodes: !4)
!36 = !DISubroutineType(types: !37)
!37 = !{null, !13}
!38 = !DILocalVariable(name: "x", arg: 1, scope: !35, file: !3, line: 8, type: !13)
!39 = !DIExpression()
!40 = !DILocation(line: 8, column: 14, scope: !35)
!41 = !DILocation(line: 9, column: 21, scope: !35)
!42 = !DILocation(line: 9, column: 4, scope: !35)
!43 = !DILocalVariable(name: "dyn_size_arr", scope: !35, file: !3, line: 9, type: !44)
!44 = !DICompositeType(tag: DW_TAG_array_type, baseType: !13, align: 32, elements: !45)
!45 = !{!46}
!46 = !DISubrange(count: -1)
!47 = !DIExpression(DW_OP_deref)
!48 = !DILocation(line: 9, column: 8, scope: !35)
!49 = !DILocation(line: 10, column: 4, scope: !35)
!50 = !DILocation(line: 10, column: 20, scope: !35)
!51 = !DILocation(line: 11, column: 1, scope: !35)

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