[llvm] 709c52b - [DebugInfo][DWARF] Emit a single location instead of a location list
via llvm-commits
llvm-commits at lists.llvm.org
Mon May 18 01:50:20 PDT 2020
Author: OCHyams
Date: 2020-05-18T09:43:32+01:00
New Revision: 709c52b9553f4ba83ab901a873392f8a7f2c56a5
URL: https://github.com/llvm/llvm-project/commit/709c52b9553f4ba83ab901a873392f8a7f2c56a5
DIFF: https://github.com/llvm/llvm-project/commit/709c52b9553f4ba83ab901a873392f8a7f2c56a5.diff
LOG: [DebugInfo][DWARF] Emit a single location instead of a location list
for variables in nested scopes (including inlined functions) if there is a
single location which covers the entire scope and the scope is contained in a
single block.
Based on work by @jmorse.
Reviewed By: vsk, aprantl
Differential Revision: https://reviews.llvm.org/D79571
Added:
llvm/test/DebugInfo/X86/single-location-inlined-param.mir
llvm/test/DebugInfo/X86/single-location-interrupted-scope.mir
llvm/test/DebugInfo/X86/single-location.mir
Modified:
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
Removed:
################################################################################
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index befda85a2ac3..17fcf692d913 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1479,10 +1479,6 @@ static bool validThroughout(LexicalScopes &LScopes,
if (LSRange.size() == 0)
return false;
- // If this range is neither open ended nor a constant, then it is not a
- // candidate for being validThroughout.
- if (RangeEnd && !DbgValue->getOperand(0).isImm())
- return false;
// Determine if the DBG_VALUE is valid at the beginning of its lexical block.
const MachineInstr *LScopeBegin = LSRange.front().first;
@@ -1524,7 +1520,28 @@ static bool validThroughout(LexicalScopes &LScopes,
if (DbgValue->getOperand(0).isImm() && MBB->pred_empty())
return true;
- return false;
+ // Now check for situations where an "open-ended" DBG_VALUE isn't enough to
+ // determine eligibility for a single location, e.g. nested scopes, inlined
+ // functions.
+ // FIXME: For now we just handle a simple (but common) case where the scope
+ // is contained in MBB. We could be smarter here.
+ //
+ // At this point we know that our scope ends in MBB. So, if RangeEnd exists
+ // outside of the block we can ignore it; the location is just leaking outside
+ // its scope.
+ assert(LScopeEnd->getParent() == MBB && "Scope ends outside MBB");
+ if (RangeEnd->getParent() != DbgValue->getParent())
+ return true;
+
+ // The location range and variable's enclosing scope are both contained within
+ // MBB, test if location terminates before end of scope.
+ for (auto I = RangeEnd->getIterator(); I != MBB->end(); ++I)
+ if (&*I == LScopeEnd)
+ return false;
+
+ // There's a single location which starts at the scope start, and ends at or
+ // after the scope end.
+ return true;
}
/// Build the location list for all DBG_VALUEs in the function that
diff --git a/llvm/test/DebugInfo/X86/single-location-inlined-param.mir b/llvm/test/DebugInfo/X86/single-location-inlined-param.mir
new file mode 100644
index 000000000000..b15c3634e2ed
--- /dev/null
+++ b/llvm/test/DebugInfo/X86/single-location-inlined-param.mir
@@ -0,0 +1,114 @@
+# RUN: llc -start-after=livedebugvalues --filetype=obj %s -o - \
+# RUN: | llvm-dwarfdump -v -name=param - | FileCheck %s
+#
+# Generated with opt -sroa -inline, llc -stop-after=livedebugvalues, with some
+# metadata removed by hand.
+#
+# int glob;
+# __attribute__((always_inline))
+# static void inline_me(int param) {
+# {
+# int local = param;
+# glob = local;
+# }
+# }
+# int fun(int number) {
+# inline_me(number);
+# if (number)
+# return 0;
+# return 1;
+# }
+#
+# The inlined parameter 'param' is available for the entirety of its enclosing
+# scope. We expect to see a single location entry despite the fact that the
+# final instruction in that scope belongs to a dominated scope.
+#
+# Except for 'param', all DILocalVariable metadata has been removed.
+#
+# Ignore first entry (abstract), we want to look at the concrete instance.
+# CHECK: DW_TAG_formal_parameter [
+# CHECK: DW_TAG_formal_parameter [
+# CHECK-NEXT: DW_AT_location [DW_FORM_exprloc] (DW_OP_reg5 RDI)
+# CHECK-NEXT: DW_AT_abstract_origin {{.*}} "param"
+
+--- |
+ target triple = "x86_64-unknown-linux-gnu"
+
+ @glob = dso_local global i32 0, align 4, !dbg !0
+ declare void @llvm.dbg.declare(metadata, metadata, metadata)
+ declare void @llvm.dbg.value(metadata, metadata, metadata)
+ define dso_local i32 @fun(i32 %number) !dbg !11 {
+ entry:
+ call void @llvm.dbg.value(metadata i32 %number, metadata !17, metadata !DIExpression()), !dbg !24
+ store i32 %number, i32* @glob, align 4, !dbg !27
+ %tobool = icmp ne i32 %number, 0, !dbg !32
+ br i1 %tobool, label %return, label %if.end, !dbg !34
+
+ if.end: ; preds = %entry
+ br label %return, !dbg !35
+
+ return: ; preds = %entry, %if.end
+ %retval.0 = phi i32 [ 1, %if.end ], [ 0, %entry ], !dbg !16
+ ret i32 %retval.0, !dbg !36
+ }
+
+ !llvm.dbg.cu = !{!2}
+ !llvm.module.flags = !{!7, !8, !9}
+ !llvm.ident = !{!10}
+
+ !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+ !1 = distinct !DIGlobalVariable(name: "glob", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+ !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 11.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
+ !3 = !DIFile(filename: "test.c", directory: "/")
+ !4 = !{}
+ !5 = !{!0}
+ !6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+ !7 = !{i32 7, !"Dwarf Version", i32 4}
+ !8 = !{i32 2, !"Debug Info Version", i32 3}
+ !9 = !{i32 1, !"wchar_size", i32 4}
+ !10 = !{!"clang version 11.0.0"}
+ !11 = distinct !DISubprogram(name: "fun", scope: !3, file: !3, line: 9, type: !12, scopeLine: 9, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !14)
+ !12 = !DISubroutineType(types: !13)
+ !13 = !{!6, !6}
+ !14 = !{}
+ !16 = !DILocation(line: 0, scope: !11)
+ !17 = !DILocalVariable(name: "param", arg: 1, scope: !18, file: !3, line: 3, type: !6)
+ !18 = distinct !DISubprogram(name: "inline_me", scope: !3, file: !3, line: 3, type: !19, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !21)
+ !19 = !DISubroutineType(types: !20)
+ !20 = !{null, !6}
+ !21 = !{!17}
+ !23 = distinct !DILexicalBlock(scope: !18, file: !3, line: 4, column: 3)
+ !24 = !DILocation(line: 0, scope: !18, inlinedAt: !25)
+ !25 = distinct !DILocation(line: 10, column: 3, scope: !11)
+ !26 = !DILocation(line: 0, scope: !23, inlinedAt: !25)
+ !27 = !DILocation(line: 6, column: 10, scope: !23, inlinedAt: !25)
+ !32 = !DILocation(line: 11, column: 7, scope: !33)
+ !33 = distinct !DILexicalBlock(scope: !11, file: !3, line: 11, column: 7)
+ !34 = !DILocation(line: 11, column: 7, scope: !11)
+ !35 = !DILocation(line: 13, column: 3, scope: !11)
+ !36 = !DILocation(line: 14, column: 1, scope: !11)
+
+...
+---
+name: fun
+body: |
+ bb.0.entry:
+ successors: %bb.2(0x50000000), %bb.1(0x30000000)
+ liveins: $edi
+
+ DBG_VALUE $edi, $noreg, !17, !DIExpression(), debug-location !24
+ MOV32mr $rip, 1, $noreg, @glob, $noreg, renamable $edi, debug-location !27 :: (store 4 into @glob)
+ renamable $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags
+ TEST32rr killed renamable $edi, renamable $edi, implicit-def $eflags, debug-location !32
+ JCC_1 %bb.1, 4, implicit $eflags, debug-location !34
+
+ bb.2.return:
+ liveins: $eax
+
+ RETQ $eax, debug-location !36
+
+ bb.1.if.end:
+ renamable $eax = MOV32ri 1
+ RETQ $eax, debug-location !36
+
+...
diff --git a/llvm/test/DebugInfo/X86/single-location-interrupted-scope.mir b/llvm/test/DebugInfo/X86/single-location-interrupted-scope.mir
new file mode 100644
index 000000000000..3d7c3469802d
--- /dev/null
+++ b/llvm/test/DebugInfo/X86/single-location-interrupted-scope.mir
@@ -0,0 +1,182 @@
+# RUN: llc -start-after=livedebugvalues --filetype=obj %s -o - \
+# RUN: | llvm-dwarfdump -v -name=parama - | FileCheck %s
+#
+# Generated with -O2, llc -stop-after=livedebugvalues, with IR modified from
+# this source:
+#
+# int globa, globb;
+# void ext();
+# static void set(int parama, int paramb) {
+# globa = parama;
+# globb = paramb;
+# }
+# void funone(int one, int two) {
+# two = two + one;
+# // 'two = ...' sunk between the inlined assignments to globa and globa.
+# set(one, two);
+# if (two > 0)
+# return ext();
+# }
+# void funtwo(int one, int two) {
+# two = one + two;
+# // 'two = ...' sunk between the inlined assignments to globa and globa,
+# // and rdi is clobbered by the sunk 'two = ...'.
+# set(one, two);
+# if (one < two)
+# return ext();
+# }
+#
+# Check that the 'parama' is available for the entire inlined scope in funone,
+# and that it is unavailable in the second DW_AT_ranges segment of the inlined
+# scope in funtwo. In both cases the inlined scope 'set' is intrerrupted by an
+# instruction from the calling function.
+#
+# Except for 'parama', all DILocalVariable metadata has been removed.
+#
+# Ignore first entry (abstract), we want to look at the concrete instances.
+# CHECK: DW_TAG_formal_parameter [
+# CHECK: DW_TAG_formal_parameter [
+# CHECK-NEXT: DW_AT_location [DW_FORM_exprloc] (DW_OP_reg5 RDI)
+# CHECK-NEXT: DW_AT_abstract_origin {{.*}} "parama"
+# CHECK: DW_TAG_formal_parameter [
+# CHECK-NEXT: DW_AT_location [DW_FORM_sec_offset]
+# CHECK-NEXT: [0x{{[0-9a-b]+}}, 0x{{[0-9a-b]+}})
+# CHECK-NEXT: DW_AT_abstract_origin {{.*}} "parama"
+
+--- |
+ target triple = "x86_64-unknown-linux-gnu"
+
+ @globa = dso_local local_unnamed_addr global i32 0, align 4, !dbg !0
+ @globb = dso_local local_unnamed_addr global i32 0, align 4, !dbg !10
+
+ declare !dbg !6 dso_local void @ext(...) local_unnamed_addr
+ declare void @llvm.dbg.value(metadata, metadata, metadata)
+
+ define dso_local void @funone(i32 %one, i32 %two) local_unnamed_addr !dbg !17 {
+ entry:
+ call void @llvm.dbg.value(metadata i32 %one, metadata !20, metadata !DIExpression()), !dbg !23
+ store i32 %one, i32* @globa, align 4, !dbg !25
+ %add = add nsw i32 %two, %one, !dbg !30
+ store i32 %add, i32* @globb, align 4, !dbg !31
+ %cmp = icmp sgt i32 %add, 0, !dbg !32
+ br i1 %cmp, label %if.then, label %if.end, !dbg !34
+
+ if.then: ; preds = %entry
+ tail call void (...) @ext(), !dbg !35
+ ret void, !dbg !36
+
+ if.end: ; preds = %entry
+ ret void, !dbg !36
+ }
+
+ define dso_local void @funtwo(i32 %one, i32 %two) local_unnamed_addr !dbg !37 {
+ entry:
+ call void @llvm.dbg.value(metadata i32 %one, metadata !20, metadata !DIExpression()), !dbg !41
+ store i32 %one, i32* @globa, align 4, !dbg !43
+ %add = add nsw i32 %two, %one, !dbg !44
+ store i32 %add, i32* @globb, align 4, !dbg !45
+ %cmp = icmp sgt i32 %two, 0, !dbg !46
+ br i1 %cmp, label %if.then, label %if.end, !dbg !48
+
+ if.then: ; preds = %entry
+ tail call void (...) @ext(), !dbg !49
+ ret void, !dbg !50
+
+ if.end: ; preds = %entry
+ ret void, !dbg !50
+ }
+
+ !llvm.dbg.cu = !{!2}
+ !llvm.module.flags = !{!13, !14, !15}
+ !llvm.ident = !{!16}
+
+ !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+ !1 = distinct !DIGlobalVariable(name: "globa", scope: !2, file: !3, line: 16, type: !12, isLocal: false, isDefinition: true)
+ !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 11.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !5, globals: !9, splitDebugInlining: false, nameTableKind: None)
+ !3 = !DIFile(filename: "test.c", directory: "/")
+ !4 = !{}
+ !5 = !{!6}
+ !6 = !DISubprogram(name: "ext", scope: !3, file: !3, line: 17, type: !7, spFlags: DISPFlagOptimized, retainedNodes: !4)
+ !7 = !DISubroutineType(types: !8)
+ !8 = !{null, null}
+ !9 = !{!0, !10}
+ !10 = !DIGlobalVariableExpression(var: !11, expr: !DIExpression())
+ !11 = distinct !DIGlobalVariable(name: "globb", scope: !2, file: !3, line: 16, type: !12, isLocal: false, isDefinition: true)
+ !12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+ !13 = !{i32 7, !"Dwarf Version", i32 4}
+ !14 = !{i32 2, !"Debug Info Version", i32 3}
+ !15 = !{i32 1, !"wchar_size", i32 4}
+ !16 = !{!"clang version 11.0.0"}
+ !17 = distinct !DISubprogram(name: "funone", scope: !3, file: !3, line: 22, type: !18, scopeLine: 22, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4)
+ !18 = !DISubroutineType(types: !19)
+ !19 = !{null, !12, !12}
+ !20 = !DILocalVariable(name: "parama", arg: 1, scope: !21, file: !3, line: 18, type: !12)
+ !21 = distinct !DISubprogram(name: "set", scope: !3, file: !3, line: 18, type: !18, scopeLine: 18, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !22)
+ !22 = !{!20}
+ !23 = !DILocation(line: 0, scope: !21, inlinedAt: !24)
+ !24 = distinct !DILocation(line: 24, column: 3, scope: !17)
+ !25 = !DILocation(line: 19, column: 9, scope: !21, inlinedAt: !24)
+ !30 = !DILocation(line: 23, column: 13, scope: !17)
+ !31 = !DILocation(line: 20, column: 9, scope: !21, inlinedAt: !24)
+ !32 = !DILocation(line: 25, column: 11, scope: !33)
+ !33 = distinct !DILexicalBlock(scope: !17, file: !3, line: 25, column: 7)
+ !34 = !DILocation(line: 25, column: 7, scope: !17)
+ !35 = !DILocation(line: 26, column: 12, scope: !33)
+ !36 = !DILocation(line: 27, column: 1, scope: !17)
+ !37 = distinct !DISubprogram(name: "funtwo", scope: !3, file: !3, line: 28, type: !18, scopeLine: 28, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !38)
+ !38 = !{}
+ !41 = !DILocation(line: 0, scope: !21, inlinedAt: !42)
+ !42 = distinct !DILocation(line: 30, column: 3, scope: !37)
+ !43 = !DILocation(line: 19, column: 9, scope: !21, inlinedAt: !42)
+ !44 = !DILocation(line: 29, column: 13, scope: !37)
+ !45 = !DILocation(line: 20, column: 9, scope: !21, inlinedAt: !42)
+ !46 = !DILocation(line: 31, column: 11, scope: !47)
+ !47 = distinct !DILexicalBlock(scope: !37, file: !3, line: 31, column: 7)
+ !48 = !DILocation(line: 31, column: 7, scope: !37)
+ !49 = !DILocation(line: 32, column: 12, scope: !47)
+ !50 = !DILocation(line: 33, column: 1, scope: !37)
+
+...
+---
+name: funone
+body: |
+ bb.0.entry:
+ successors: %bb.2(0x50000000), %bb.1(0x30000000)
+ liveins: $edi, $esi
+
+ DBG_VALUE $edi, $noreg, !20, !DIExpression(), debug-location !23
+ MOV32mr $rip, 1, $noreg, @globa, $noreg, renamable $edi, debug-location !25 :: (store 4 into @globa)
+ renamable $esi = ADD32rr killed renamable $esi, killed renamable $edi, implicit-def $eflags, debug-location !32
+ MOV32mr $rip, 1, $noreg, @globb, $noreg, killed renamable $esi, debug-location !31 :: (store 4 into @globb)
+ JCC_1 %bb.1, 14, implicit $eflags, debug-location !34
+
+ bb.2.if.then:
+ dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !35
+ TAILJMPd64 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rsp, implicit $ssp, implicit killed $al, debug-location !35
+
+ bb.1.if.end:
+ RETQ debug-location !36
+
+...
+---
+name: funtwo
+body: |
+ bb.0.entry:
+ successors: %bb.2(0x50000000), %bb.1(0x30000000)
+ liveins: $edi, $esi
+
+ DBG_VALUE $edi, $noreg, !20, !DIExpression(), debug-location !41
+ MOV32mr $rip, 1, $noreg, @globa, $noreg, renamable $edi, debug-location !43 :: (store 4 into @globa)
+ renamable $edi = nsw ADD32rr killed renamable $edi, renamable $esi, implicit-def dead $eflags, debug-location !44
+ MOV32mr $rip, 1, $noreg, @globb, $noreg, killed renamable $edi, debug-location !45 :: (store 4 into @globb)
+ TEST32rr killed renamable $esi, renamable $esi, implicit-def $eflags, debug-location !46
+ JCC_1 %bb.1, 14, implicit $eflags, debug-location !48
+
+ bb.2.if.then:
+ dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !49
+ TAILJMPd64 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rsp, implicit $ssp, implicit killed $al, debug-location !49
+
+ bb.1.if.end:
+ RETQ debug-location !50
+
+...
diff --git a/llvm/test/DebugInfo/X86/single-location.mir b/llvm/test/DebugInfo/X86/single-location.mir
new file mode 100644
index 000000000000..e1ff9c066a4f
--- /dev/null
+++ b/llvm/test/DebugInfo/X86/single-location.mir
@@ -0,0 +1,82 @@
+# RUN: llc -start-after=livedebugvalues --filetype=obj %s -o - \
+# RUN: | llvm-dwarfdump -v - | FileCheck %s
+#
+# Generated at -O2, stopped after livedebugvalues, with some metadata removed
+# by hand:
+# int global;
+# void ext();
+# void fun(int p) {
+# {
+# int local = p;
+# global = local;
+# }
+# ext();
+# }
+#
+# The variable 'local' is available for the entirety of its enclosing scope so
+# we expect to see a single location entry.
+#
+# Except for 'local', all DILocalVariable metadata has been removed.
+#
+# CHECK: DW_TAG_lexical_block [
+# CHECK: DW_TAG_variable
+# CHECK-NEXT: DW_AT_location [DW_FORM_exprloc] (DW_OP_reg5 RDI)
+# CHECK-NEXT: DW_AT_name {{.*}} = "local"
+
+--- |
+ target triple = "x86_64-unknown-linux-gnu"
+ @global = dso_local local_unnamed_addr global i32 0, align 4, !dbg !0
+ define dso_local void @fun(i32 %p) local_unnamed_addr !dbg !15 {
+ entry:
+ call void @llvm.dbg.value(metadata i32 %p, metadata !20, metadata !DIExpression()), !dbg !23
+ store i32 %p, i32* @global, align 4, !dbg !24
+ tail call void (...) @ext(), !dbg !29
+ ret void, !dbg !30
+ }
+
+ declare !dbg !6 dso_local void @ext(...) local_unnamed_addr
+ declare void @llvm.dbg.value(metadata, metadata, metadata)
+
+ !llvm.dbg.cu = !{!2}
+ !llvm.module.flags = !{!11, !12, !13}
+ !llvm.ident = !{!14}
+
+ !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+ !1 = distinct !DIGlobalVariable(name: "global", scope: !2, file: !3, line: 1, type: !10, isLocal: false, isDefinition: true)
+ !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 11.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !5, globals: !9, splitDebugInlining: false, nameTableKind: None)
+ !3 = !DIFile(filename: "test.c", directory: "/")
+ !4 = !{}
+ !5 = !{!6}
+ !6 = !DISubprogram(name: "ext", scope: !3, file: !3, line: 2, type: !7, spFlags: DISPFlagOptimized, retainedNodes: !4)
+ !7 = !DISubroutineType(types: !8)
+ !8 = !{null, null}
+ !9 = !{!0}
+ !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+ !11 = !{i32 7, !"Dwarf Version", i32 4}
+ !12 = !{i32 2, !"Debug Info Version", i32 3}
+ !13 = !{i32 1, !"wchar_size", i32 4}
+ !14 = !{!"clang version 11.0.0"}
+ !15 = distinct !DISubprogram(name: "fun", scope: !3, file: !3, line: 3, type: !16, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !18)
+ !16 = !DISubroutineType(types: !17)
+ !17 = !{null, !10}
+ !18 = !{!20}
+ !20 = !DILocalVariable(name: "local", scope: !21, file: !3, line: 5, type: !10)
+ !21 = distinct !DILexicalBlock(scope: !15, file: !3, line: 4, column: 3)
+ !22 = !DILocation(line: 0, scope: !15)
+ !23 = !DILocation(line: 0, scope: !21)
+ !24 = !DILocation(line: 6, column: 12, scope: !21)
+ !29 = !DILocation(line: 8, column: 3, scope: !15)
+ !30 = !DILocation(line: 9, column: 1, scope: !15)
+
+...
+---
+name: fun
+body: |
+ bb.0.entry:
+ liveins: $edi
+
+ DBG_VALUE $edi, $noreg, !20, !DIExpression(), debug-location !23
+ MOV32mr $rip, 1, $noreg, @global, $noreg, killed renamable $edi, debug-location !24 :: (store 4 into @global)
+ dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !29
+ TAILJMPd64 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rsp, implicit $ssp, implicit killed $al, debug-location !29
+...
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