maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/test/DebugInfo/X86/single-dbg_value.ll

72 lines
2.5 KiB
LLVM
Raw Normal View History

Fix PR26585 by improving the promotion of DBG_VALUEs to DW_AT_locations. When a variable is described by a single DBG_VALUE instruction we can often use a more efficient inline DW_AT_location instead of using a location list. This commit makes the heuristic that decides when to apply this optimization stricter by also verifying that the DBG_VALUE is live at the entry of the function (instead of just checking that it is valid until the end of the function). <rdar://problem/24611008> llvm-svn: 262247
2016-03-01 03:49:46 +08:00
; RUN: %llc_dwarf -stop-after=livedebugvalues -o /dev/null %s 2>&1 \
; RUN: | FileCheck %s --check-prefix=SANITY
; RUN: %llc_dwarf -march=x86-64 -o - %s -filetype=obj \
; RUN: | llvm-dwarfdump -debug-dump=all - | FileCheck %s
;
; CHECK: .debug_info contents:
; CHECK: DW_TAG_variable
; CHECK-NEXT: DW_AT_location [DW_FORM_data4]
; CHECK-NEXT: DW_AT_name{{.*}}"a"
; CHECK: .debug_loc contents:
; rax, piece 0x00000004
; CHECK: Location description: 50 93 04
; SANITY: DBG_VALUE
; SANITY-NOT: DBG_VALUE
; ModuleID = 'test.ll'
; Compiled with -O:
; void h(int);
; int g();
; void f() {
; h(0);
; int a = g();
; h(a);
; }
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx"
; Function Attrs: nounwind ssp uwtable
define void @f() #0 !dbg !4 {
entry:
tail call void @h(i32 0) #2, !dbg !14
%call = tail call i32 (...) @g() #2, !dbg !15
tail call void @llvm.dbg.value(metadata i32 %call, i64 0, metadata !8, metadata !16), !dbg !17
tail call void @h(i32 %call) #2, !dbg !18
ret void, !dbg !19
}
declare void @h(i32)
declare i32 @g(...)
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
attributes #0 = { nounwind ssp uwtable "no-frame-pointer-elim"="true" }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!10, !11, !12}
!llvm.ident = !{!13}
testcase gardening: update the emissionKind enum to the new syntax. (NFC) llvm-svn: 265081
2016-04-01 08:16:49 +08:00
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, subprograms: !3)
Fix PR26585 by improving the promotion of DBG_VALUEs to DW_AT_locations. When a variable is described by a single DBG_VALUE instruction we can often use a more efficient inline DW_AT_location instead of using a location list. This commit makes the heuristic that decides when to apply this optimization stricter by also verifying that the DBG_VALUE is live at the entry of the function (instead of just checking that it is valid until the end of the function). <rdar://problem/24611008> llvm-svn: 262247
2016-03-01 03:49:46 +08:00
!1 = !DIFile(filename: "test.c", directory: "/Volumes/Data/llvm")
!2 = !{}
!3 = !{!4}
!4 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, variables: !7)
!5 = !DISubroutineType(types: !6)
!6 = !{null}
!7 = !{!8}
!8 = !DILocalVariable(name: "a", scope: !4, file: !1, line: 5, type: !9)
!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!10 = !{i32 2, !"Dwarf Version", i32 2}
!11 = !{i32 2, !"Debug Info Version", i32 3}
!12 = !{i32 1, !"PIC Level", i32 2}
!13 = !{!"clang version 3.9.0 "}
!14 = !DILocation(line: 4, column: 3, scope: !4)
!15 = !DILocation(line: 5, column: 11, scope: !4)
!16 = !DIExpression()
!17 = !DILocation(line: 5, column: 7, scope: !4)
!18 = !DILocation(line: 6, column: 3, scope: !4)
!19 = !DILocation(line: 7, column: 1, scope: !4)