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llvm-project/llvm/test/DebugInfo/X86/dwarf-no-source-loc.ll

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Recommit r288212: Emit 'no line' information for interesting 'orphan' instructions. DWARF specifies that "line 0" really means "no appropriate source location" in the line table. By default, use this for branch targets and some other cases that have no specified source location, to prevent inheriting unfortunate line numbers from physically preceding instructions (which might be from completely unrelated source). Updated patch allows enabling or suppressing this behavior for all unspecified source locations. Differential Revision: http://reviews.llvm.org/D24180 llvm-svn: 289468
2016-12-13 04:49:11 +08:00
; Verify "no source location" directives appear in appropriate places,
; but don't appear when we explicitly suppress them.
; RUN: llc < %s -o - | FileCheck %s
; RUN: llc < %s -o - -use-unknown-locations=Disable | FileCheck %s --check-prefix=DISABLE
; Generated from this .cpp targeting linux using -g
; and then removed function attributes as clutter.
;
; void bar(int *);
; void baz(int *);
; # 5 "no-source-loc.cpp"
; void foo(int x) {
; int z;
; if (x)
; # 20 "include.h"
; bar(&z);
; # 10 "no-source-loc.cpp"
; baz(&z);
; }
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: uwtable
define void @_Z3fooi(i32 %x) !dbg !6 {
entry:
%x.addr = alloca i32, align 4
%z = alloca i32, align 4
store i32 %x, i32* %x.addr, align 4
%0 = load i32, i32* %x.addr, align 4, !dbg !8
%tobool = icmp ne i32 %0, 0, !dbg !8
br i1 %tobool, label %if.then, label %if.end, !dbg !8
if.then: ; preds = %entry
call void @_Z3barPi(i32* %z), !dbg !9
br label %if.end, !dbg !9
if.end: ; preds = %if.then, %entry
call void @_Z3bazPi(i32* %z), !dbg !12
ret void, !dbg !14
}
; CHECK: .loc 1 7 7
; CHECK-NOT: .loc
[DWARF] Preserve column number when emitting 'line 0' record Follow-up to r289256, address a FIXME to avoid resetting the column number. This reduced .debug_line by 2.6% in a RelWithDebInfo self-build of clang. llvm-svn: 289620
2016-12-14 08:27:35 +08:00
; CHECK: .loc 1 0 7 is_stmt 0
Recommit r288212: Emit 'no line' information for interesting 'orphan' instructions. DWARF specifies that "line 0" really means "no appropriate source location" in the line table. By default, use this for branch targets and some other cases that have no specified source location, to prevent inheriting unfortunate line numbers from physically preceding instructions (which might be from completely unrelated source). Updated patch allows enabling or suppressing this behavior for all unspecified source locations. Differential Revision: http://reviews.llvm.org/D24180 llvm-svn: 289468
2016-12-13 04:49:11 +08:00
; CHECK-NOT: .loc
; CHECK: .loc 2 20 5 is_stmt 1
; CHECK: .LBB0_2:
[DWARF] Preserve column number when emitting 'line 0' record Follow-up to r289256, address a FIXME to avoid resetting the column number. This reduced .debug_line by 2.6% in a RelWithDebInfo self-build of clang. llvm-svn: 289620
2016-12-14 08:27:35 +08:00
; CHECK-NEXT: .loc 2 0 5 is_stmt 0
Recommit r288212: Emit 'no line' information for interesting 'orphan' instructions. DWARF specifies that "line 0" really means "no appropriate source location" in the line table. By default, use this for branch targets and some other cases that have no specified source location, to prevent inheriting unfortunate line numbers from physically preceding instructions (which might be from completely unrelated source). Updated patch allows enabling or suppressing this behavior for all unspecified source locations. Differential Revision: http://reviews.llvm.org/D24180 llvm-svn: 289468
2016-12-13 04:49:11 +08:00
; CHECK-NOT: .loc
; CHECK: .loc 1 10 3 is_stmt 1
;
; DISABLE-NOT: .loc 1 0
declare void @_Z3barPi(i32*)
declare void @_Z3bazPi(i32*)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!llvm.ident = !{!5}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 4.0.0 (trunk 278782)", isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
!1 = !DIFile(filename: "no-source-loc.cpp", directory: "/tests")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{!"clang version 4.0.0 (trunk 278782)"}
!6 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 5, type: !7, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!7 = !DISubroutineType(types: !2)
!8 = !DILocation(line: 7, column: 7, scope: !6)
!9 = !DILocation(line: 20, column: 5, scope: !10)
!10 = !DILexicalBlockFile(scope: !6, file: !11, discriminator: 0)
!11 = !DIFile(filename: "include.h", directory: "/tests")
!12 = !DILocation(line: 10, column: 3, scope: !13)
!13 = !DILexicalBlockFile(scope: !6, file: !1, discriminator: 0)
!14 = !DILocation(line: 11, column: 1, scope: !13)