mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-24 05:23:45 +02:00
fb3abba237
Currently each Function points to a DISubprogram and DISubprogram has a scope field. For member functions the scope is a DICompositeType. DIScopes point to the DICompileUnit to facilitate type uniquing. Distinct DISubprograms (with isDefinition: true) are not part of the type hierarchy and cannot be uniqued. This change removes the subprograms list from DICompileUnit and instead adds a pointer to the owning compile unit to distinct DISubprograms. This would make it easy for ThinLTO to strip unneeded DISubprograms and their transitively referenced debug info. Motivation ---------- Materializing DISubprograms is currently the most expensive operation when doing a ThinLTO build of clang. We want the DISubprogram to be stored in a separate Bitcode block (or the same block as the function body) so we can avoid having to expensively deserialize all DISubprograms together with the global metadata. If a function has been inlined into another subprogram we need to store a reference the block containing the inlined subprogram. Attached to https://llvm.org/bugs/show_bug.cgi?id=27284 is a python script that updates LLVM IR testcases to the new format. http://reviews.llvm.org/D19034 <rdar://problem/25256815> llvm-svn: 266446
101 lines
4.3 KiB
LLVM
101 lines
4.3 KiB
LLVM
; RUN: opt -adce -S < %s | FileCheck %s
|
|
; Test that debug info intrinsics in dead scopes get eliminated by -adce.
|
|
|
|
; Generated with 'clang -g -S -emit-llvm | opt -mem2reg -inline' at r262899
|
|
; (before -adce was augmented) and then hand-reduced. This was the input:
|
|
;
|
|
;;void sink(void);
|
|
;;
|
|
;;void variable_in_unused_subscope(void) {
|
|
;; { int i = 0; }
|
|
;; sink();
|
|
;;}
|
|
;;
|
|
;;void variable_in_parent_scope(void) {
|
|
;; int i = 0;
|
|
;; { sink(); }
|
|
;;}
|
|
;;
|
|
;;static int empty_function_with_unused_variable(void) {
|
|
;; { int i = 0; }
|
|
;; return 0;
|
|
;;}
|
|
;;
|
|
;;void calls_empty_function_with_unused_variable_in_unused_subscope(void) {
|
|
;; { empty_function_with_unused_variable(); }
|
|
;; sink();
|
|
;;}
|
|
|
|
declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
|
|
|
|
declare void @sink()
|
|
|
|
; CHECK-LABEL: define void @variable_in_unused_subscope(
|
|
define void @variable_in_unused_subscope() !dbg !4 {
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: call void @sink
|
|
; CHECK-NEXT: ret void
|
|
entry:
|
|
call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !15, metadata !17), !dbg !18
|
|
call void @sink(), !dbg !19
|
|
ret void, !dbg !20
|
|
}
|
|
|
|
; CHECK-LABEL: define void @variable_in_parent_scope(
|
|
define void @variable_in_parent_scope() !dbg !7 {
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: call void @llvm.dbg.value
|
|
; CHECK-NEXT: call void @sink
|
|
; CHECK-NEXT: ret void
|
|
entry:
|
|
call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !21, metadata !17), !dbg !22
|
|
call void @sink(), !dbg !23
|
|
ret void, !dbg !25
|
|
}
|
|
|
|
; CHECK-LABEL: define void @calls_empty_function_with_unused_variable_in_unused_subscope(
|
|
define void @calls_empty_function_with_unused_variable_in_unused_subscope() !dbg !8 {
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: call void @sink
|
|
; CHECK-NEXT: ret void
|
|
entry:
|
|
call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !26, metadata !17), !dbg !28
|
|
call void @sink(), !dbg !31
|
|
ret void, !dbg !32
|
|
}
|
|
|
|
!llvm.dbg.cu = !{!0}
|
|
!llvm.module.flags = !{!14}
|
|
|
|
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
|
|
!1 = !DIFile(filename: "t.c", directory: "/path/to/test/Transforms/ADCE")
|
|
!2 = !{}
|
|
!4 = distinct !DISubprogram(name: "variable_in_unused_subscope", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
|
|
!5 = !DISubroutineType(types: !6)
|
|
!6 = !{null}
|
|
!7 = distinct !DISubprogram(name: "variable_in_parent_scope", scope: !1, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
|
|
!8 = distinct !DISubprogram(name: "calls_empty_function_with_unused_variable_in_unused_subscope", scope: !1, file: !1, line: 18, type: !5, isLocal: false, isDefinition: true, scopeLine: 18, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
|
|
!10 = distinct !DISubprogram(name: "empty_function_with_unused_variable", scope: !1, file: !1, line: 13, type: !11, isLocal: true, isDefinition: true, scopeLine: 13, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
|
|
!11 = !DISubroutineType(types: !12)
|
|
!12 = !{!13}
|
|
!13 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
|
|
!14 = !{i32 2, !"Debug Info Version", i32 3}
|
|
!15 = !DILocalVariable(name: "i", scope: !16, file: !1, line: 4, type: !13)
|
|
!16 = distinct !DILexicalBlock(scope: !4, file: !1, line: 4, column: 3)
|
|
!17 = !DIExpression()
|
|
!18 = !DILocation(line: 4, column: 9, scope: !16)
|
|
!19 = !DILocation(line: 5, column: 3, scope: !4)
|
|
!20 = !DILocation(line: 6, column: 1, scope: !4)
|
|
!21 = !DILocalVariable(name: "i", scope: !7, file: !1, line: 9, type: !13)
|
|
!22 = !DILocation(line: 9, column: 7, scope: !7)
|
|
!23 = !DILocation(line: 10, column: 5, scope: !24)
|
|
!24 = distinct !DILexicalBlock(scope: !7, file: !1, line: 10, column: 3)
|
|
!25 = !DILocation(line: 11, column: 1, scope: !7)
|
|
!26 = !DILocalVariable(name: "i", scope: !27, file: !1, line: 14, type: !13)
|
|
!27 = distinct !DILexicalBlock(scope: !10, file: !1, line: 14, column: 3)
|
|
!28 = !DILocation(line: 14, column: 9, scope: !27, inlinedAt: !29)
|
|
!29 = distinct !DILocation(line: 19, column: 5, scope: !30)
|
|
!30 = distinct !DILexicalBlock(scope: !8, file: !1, line: 19, column: 3)
|
|
!31 = !DILocation(line: 20, column: 3, scope: !8)
|
|
!32 = !DILocation(line: 21, column: 1, scope: !8)
|