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[llvm-dwarfdump][test] Add a --statistics test for a DW_AT_artificial variable

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There is an untested but useful case: `this` (even if not written) is counted as a
source variable.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D86044
This commit is contained in:
Fangrui Song 2020-08-18 09:07:38 -07:00
parent 831953d6d2
commit af8011f23e
1 changed files with 37 additions and 7 deletions
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44
test/tools/llvm-dwarfdump/X86/statistics.ll
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@ -23,6 +23,11 @@
;
; int boo(int, int) {}
; struct T {
; void empty();
; };
; void T::empty() {}
; Following variables/arguments/members should be counted:
; - GlobalConst,
; - Global,
@ -30,16 +35,17 @@
; - square::i,
; - cube::i, cube::squared
; - boo::1, boo::2
; - this in T::empty()
; Skipped entities:
; - declaration of test::a,
; - non-constant member S:fn,
; - arguments of S:fn.
; CHECK: "#unique source variables":9
; CHECK: "#unique source variables":10
; +1 extra inline i.
; CHECK: "#source variables":10
; CHECK: "#source variables":11
; -1 square::i
; CHECK: "#source variables with location":9
; CHECK: "#source variables with location":10
; CHECK: "sum_all_local_vars(#bytes in parent scope)":[[BYTES:[0-9]+]]
; Because of the dbg.value in the middle of the function, the pc range coverage
; must be below 100%.
@ -48,11 +54,11 @@
; CHECK: "sum_all_local_vars(#bytes in parent scope covered by DW_AT_location)":
; CHECK: "#bytes witin functions":[[FUNCSIZE:[0-9]+]]
; CHECK: "#bytes witin inlined functions":[[INLINESIZE:[0-9]+]]
; CHECK: "#bytes in __debug_info":380
; CHECK: "#bytes in __debug_info":459
; CHECK: "#bytes in __debug_loc":35
; CHECK: "#bytes in __debug_abbrev":303
; CHECK: "#bytes in __debug_line":117
; CHECK: "#bytes in __debug_str":204
; CHECK: "#bytes in __debug_abbrev":384
; CHECK: "#bytes in __debug_line":126
; CHECK: "#bytes in __debug_str":231
; ModuleID = '/tmp/quality.cpp'
source_filename = "/tmp/quality.cpp"
@ -118,6 +124,17 @@ entry:
ret i32 0, !dbg !58
}
%struct.T = type { i8 }
define void @_ZN1T5emptyEv(%struct.T* %this) #2 !dbg !59 {
entry:
%this.addr = alloca %struct.T*, align 8
store %struct.T* %this, %struct.T** %this.addr, align 8
call void @llvm.dbg.declare(metadata %struct.T** %this.addr, metadata !67, metadata !DIExpression()), !dbg !69
%this1 = load %struct.T*, %struct.T** %this.addr, align 8
ret void, !dbg !70
}
attributes #0 = { alwaysinline nounwind ssp uwtable }
attributes #1 = { nounwind readnone speculatable }
attributes #2 = { noinline nounwind optnone ssp uwtable }
@ -185,3 +202,16 @@ attributes #2 = { noinline nounwind optnone ssp uwtable }
!56 = !DILocation(line: 10, column: 12, scope: !52)
!57 = !DILocalVariable(arg: 2, scope: !52, file: !3, line: 10, type: !8)
!58 = !DILocation(line: 10, column: 17, scope: !52)
!59 = distinct !DISubprogram(name: "empty", linkageName: "_ZN1T5emptyEv", scope: !60, file: !3, line: 25, type: !63, scopeLine: 25, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !2, declaration: !62, retainedNodes: !4)
!60 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "T", file: !3, line: 22, size: 8, flags: DIFlagTypePassByValue, elements: !61, identifier: "_ZTS1T")
!61 = !{!62}
!62 = !DISubprogram(name: "empty", linkageName: "_ZN1T5emptyEv", scope: !60, file: !3, line: 23, type: !63, scopeLine: 23, flags: DIFlagPrototyped, spFlags: 0)
!63 = !DISubroutineType(types: !64)
!64 = !{!65, !66}
!65 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
!66 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !60, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
!67 = !DILocalVariable(name: "this", arg: 1, scope: !59, type: !68, flags: DIFlagArtificial | DIFlagObjectPointer)
!68 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !60, size: 64)
!69 = !DILocation(line: 0, scope: !59)
!70 = !DILocation(line: 25, column: 19, scope: !59)