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llvm-6502/test/DebugInfo/PR20038.ll
Duncan P. N. Exon Smith 88e419d66e DebugInfo: Remove 'inlinedAt:' field from MDLocalVariable 
Remove 'inlinedAt:' from MDLocalVariable.  Besides saving some memory
(variables with it seem to be single largest `Metadata` contributer to
memory usage right now in -g -flto builds), this stops optimization and
backend passes from having to change local variables.

The 'inlinedAt:' field was used by the backend in two ways:

 1. To tell the backend whether and into what a variable was inlined.
 2. To create a unique id for each inlined variable.

Instead, rely on the 'inlinedAt:' field of the intrinsic's `!dbg`
attachment, and change the DWARF backend to use a typedef called
`InlinedVariable` which is `std::pair<MDLocalVariable*, MDLocation*>`.
This `DebugLoc` is already passed reliably through the backend (as
verified by r234021).

This commit removes the check from r234021, but I added a new check
(that will survive) in r235048, and changed the `DIBuilder` API in
r235041 to require a `!dbg` attachment whose 'scope:` is in the same
`MDSubprogram` as the variable's.

If this breaks your out-of-tree testcases, perhaps the script I used
(mdlocalvariable-drop-inlinedat.sh) will help; I'll attach it to PR22778
in a moment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235050 91177308-0d34-0410-b5e6-96231b3b80d8
2015-04-15 22:29:27 +00:00

170 lines
8.3 KiB
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; REQUIRES: object-emission
; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
; IR generated from clang -O0 with:
; struct C {
; ~C();
; };
; extern bool b;
; void fun4() { b && (C(), 1); }
; __attribute__((always_inline)) C::~C() { }
; CHECK: DW_TAG_structure_type
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "C"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_subprogram
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "~C"
; CHECK: DW_TAG_subprogram
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_linkage_name {{.*}} "_ZN1CD1Ev"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_formal_parameter
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "this"
; CHECK: DW_TAG_subprogram
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "fun4"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_inlined_subroutine
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_abstract_origin {{.*}} "_ZN1CD1Ev"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_formal_parameter
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_abstract_origin {{.*}} "this"
; FIXME: D2 is actually inlined into D1 but doesn't show up here, possibly due
; to there being no work in D2 (calling another member function from the dtor
; causes D2 to show up, calling a free function doesn't).
; CHECK-NOT: DW_TAG
; CHECK: NULL
; CHECK-NOT: DW_TAG
; CHECK: NULL
%struct.C = type { i8 }
@b = external global i8
; Function Attrs: nounwind
define void @_Z4fun4v() #0 {
entry:
%this.addr.i.i = alloca %struct.C*, align 8, !dbg !21
%this.addr.i = alloca %struct.C*, align 8, !dbg !22
%agg.tmp.ensured = alloca %struct.C, align 1
%cleanup.cond = alloca i1
%0 = load i8, i8* @b, align 1, !dbg !24
%tobool = trunc i8 %0 to i1, !dbg !24
store i1 false, i1* %cleanup.cond
br i1 %tobool, label %land.rhs, label %land.end, !dbg !24
land.rhs: ; preds = %entry
store i1 true, i1* %cleanup.cond, !dbg !25
br label %land.end
land.end: ; preds = %land.rhs, %entry
%1 = phi i1 [ false, %entry ], [ true, %land.rhs ]
%cleanup.is_active = load i1, i1* %cleanup.cond, !dbg !27
br i1 %cleanup.is_active, label %cleanup.action, label %cleanup.done, !dbg !27
cleanup.action: ; preds = %land.end
store %struct.C* %agg.tmp.ensured, %struct.C** %this.addr.i, align 8, !dbg !22
call void @llvm.dbg.declare(metadata %struct.C** %this.addr.i, metadata !129, metadata !MDExpression()), !dbg !31
%this1.i = load %struct.C*, %struct.C** %this.addr.i, !dbg !22
store %struct.C* %this1.i, %struct.C** %this.addr.i.i, align 8, !dbg !21
call void @llvm.dbg.declare(metadata %struct.C** %this.addr.i.i, metadata !132, metadata !MDExpression()), !dbg !33
%this1.i.i = load %struct.C*, %struct.C** %this.addr.i.i, !dbg !21
br label %cleanup.done, !dbg !22
cleanup.done: ; preds = %cleanup.action, %land.end
ret void, !dbg !34
}
; Function Attrs: alwaysinline nounwind
define void @_ZN1CD1Ev(%struct.C* %this) unnamed_addr #1 align 2 {
entry:
%this.addr.i = alloca %struct.C*, align 8, !dbg !37
%this.addr = alloca %struct.C*, align 8
store %struct.C* %this, %struct.C** %this.addr, align 8
call void @llvm.dbg.declare(metadata %struct.C** %this.addr, metadata !29, metadata !MDExpression()), !dbg !38
%this1 = load %struct.C*, %struct.C** %this.addr
store %struct.C* %this1, %struct.C** %this.addr.i, align 8, !dbg !37
call void @llvm.dbg.declare(metadata %struct.C** %this.addr.i, metadata !232, metadata !MDExpression()), !dbg !39
%this1.i = load %struct.C*, %struct.C** %this.addr.i, !dbg !37
ret void, !dbg !37
}
; Function Attrs: alwaysinline nounwind
define void @_ZN1CD2Ev(%struct.C* %this) unnamed_addr #1 align 2 {
entry:
%this.addr = alloca %struct.C*, align 8
store %struct.C* %this, %struct.C** %this.addr, align 8
call void @llvm.dbg.declare(metadata %struct.C** %this.addr, metadata !32, metadata !MDExpression()), !dbg !40
%this1 = load %struct.C*, %struct.C** %this.addr
ret void, !dbg !41
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { alwaysinline nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!18, !19}
!llvm.ident = !{!20}
!0 = !MDCompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !11, globals: !2, imports: !2)
!1 = !MDFile(filename: "<stdin>", directory: "/tmp/dbginfo")
!2 = !{}
!3 = !{!4}
!4 = !MDCompositeType(tag: DW_TAG_structure_type, name: "C", line: 1, size: 8, align: 8, file: !5, elements: !6, identifier: "_ZTS1C")
!5 = !MDFile(filename: "PR20038.cpp", directory: "/tmp/dbginfo")
!6 = !{!7}
!7 = !MDSubprogram(name: "~C", line: 2, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 2, file: !5, scope: !"_ZTS1C", type: !8)
!8 = !MDSubroutineType(types: !9)
!9 = !{null, !10}
!10 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !"_ZTS1C")
!11 = !{!12, !16, !17}
!12 = !MDSubprogram(name: "fun4", linkageName: "_Z4fun4v", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 5, file: !5, scope: !13, type: !14, function: void ()* @_Z4fun4v, variables: !2)
!13 = !MDFile(filename: "PR20038.cpp", directory: "/tmp/dbginfo")
!14 = !MDSubroutineType(types: !15)
!15 = !{null}
!16 = !MDSubprogram(name: "~C", linkageName: "_ZN1CD2Ev", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 6, file: !5, scope: !"_ZTS1C", type: !8, function: void (%struct.C*)* @_ZN1CD2Ev, declaration: !7, variables: !2)
!17 = !MDSubprogram(name: "~C", linkageName: "_ZN1CD1Ev", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 6, file: !5, scope: !"_ZTS1C", type: !8, function: void (%struct.C*)* @_ZN1CD1Ev, declaration: !7, variables: !2)
!18 = !{i32 2, !"Dwarf Version", i32 4}
!19 = !{i32 2, !"Debug Info Version", i32 3}
!20 = !{!"clang version 3.5.0 "}
!21 = !MDLocation(line: 6, scope: !17, inlinedAt: !22)
!22 = !MDLocation(line: 5, scope: !23)
!23 = distinct !MDLexicalBlock(line: 5, column: 0, file: !5, scope: !12)
!24 = !MDLocation(line: 5, scope: !12)
!25 = !MDLocation(line: 5, scope: !26)
!26 = distinct !MDLexicalBlock(line: 5, column: 0, file: !5, scope: !12)
!27 = !MDLocation(line: 5, scope: !28)
!28 = distinct !MDLexicalBlock(line: 5, column: 0, file: !5, scope: !12)
!29 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !17, type: !30)
!30 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !"_ZTS1C")
!31 = !MDLocation(line: 0, scope: !17, inlinedAt: !22)
!32 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !16, type: !30)
!33 = !MDLocation(line: 0, scope: !16, inlinedAt: !21)
!129 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !17, type: !30)
!132 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !16, type: !30)
!232 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !16, type: !30)
!34 = !MDLocation(line: 5, scope: !35)
!35 = distinct !MDLexicalBlock(line: 5, column: 0, file: !5, scope: !36)
!36 = distinct !MDLexicalBlock(line: 5, column: 0, file: !5, scope: !12)
!37 = !MDLocation(line: 6, scope: !17)
!38 = !MDLocation(line: 0, scope: !17)
!39 = !MDLocation(line: 0, scope: !16, inlinedAt: !37)
!40 = !MDLocation(line: 0, scope: !16)
!41 = !MDLocation(line: 6, scope: !16)
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