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llvm-mirror/test/DebugInfo/X86/sdag-dangling-dbgvalue.ll
Shiva Chen a2029fa58e [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 
In order to set breakpoints on labels and list source code around
labels, we need collect debug information for labels, i.e., label
name, the function label belong, line number in the file, and the
address label located. In order to keep these information in LLVM
IR and to allow backend to generate debug information correctly.
We create a new kind of metadata for labels, DILabel. The format
of DILabel is

!DILabel(scope: !1, name: "foo", file: !2, line: 3)

We hope to keep debug information as much as possible even the
code is optimized. So, we create a new kind of intrinsic for label
metadata to avoid the metadata is eliminated with basic block.
The intrinsic will keep existing if we keep it from optimized out.
The format of the intrinsic is

llvm.dbg.label(metadata !1)

It has only one argument, that is the DILabel metadata. The
intrinsic will follow the label immediately. Backend could get the
label metadata through the intrinsic's parameter.

We also create DIBuilder API for labels to be used by Frontend.
Frontend could use createLabel() to allocate DILabel objects, and use
insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR.

Differential Revision: https://reviews.llvm.org/D45024

Patch by Hsiangkai Wang.

llvm-svn: 331841
2018-05-09 02:40:45 +00:00

196 lines
9.5 KiB
LLVM
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; RUN: llc %s -stop-before expand-isel-pseudos -o - | FileCheck %s
;--------------------------------------------------------------------
; This test case is basically generated from the following C code.
; Compiled with "--target=x86_64-apple-darwin -S -g -O3" to get debug
; info for optimized code.
;
; struct SS {
; int a;
; int b;
; } S = { .a = 23, .b = -17 };
;
; int test1() {
; struct SS* foo1 = &S;
; return (int)foo1;
; }
;
; int test2() {
; struct SS* foo2 = &S;
; struct SS* bar2 = &S;
; return (int)foo2 + (int)bar2;
; }
;
; int test3() {
; struct SS* bar3 = &S;
; struct SS* foo3 = &S;
; return (int)foo3 + (int)bar3;
; }
;
; int test4() {
; struct SS* foo4 = &S;
; struct SS* bar4 = &S;
; foo = 0;
; return (int)foo4 + (int)bar4;
; }
;
; int test5() {
; struct SS* bar5 = &S;
; struct SS* foo5 = &S;
; foo5 = 0;
; return (int)foo5 + (int)bar5;
; }
;--------------------------------------------------------------------
; CHECK: ![[FOO1:.*]] = !DILocalVariable(name: "foo1"
; CHECK: ![[BAR1:.*]] = !DILocalVariable(name: "bar1"
; CHECK: ![[FOO2:.*]] = !DILocalVariable(name: "foo2"
; CHECK: ![[BAR2:.*]] = !DILocalVariable(name: "bar2"
; CHECK: ![[FOO3:.*]] = !DILocalVariable(name: "bar3"
; CHECK: ![[BAR3:.*]] = !DILocalVariable(name: "foo3"
; CHECK: ![[FOO4:.*]] = !DILocalVariable(name: "foo4"
; CHECK: ![[BAR4:.*]] = !DILocalVariable(name: "bar4"
; CHECK: ![[BAR5:.*]] = !DILocalVariable(name: "bar5"
; CHECK: ![[FOO5:.*]] = !DILocalVariable(name: "foo5"
source_filename = "sdag-dangling-dbgvalue.c"
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.4.0"
%struct.SS = type { i32, i32 }
@S = global %struct.SS { i32 23, i32 -17 }, align 4, !dbg !0
; Verify that the def comes before the debug-use for foo1.
; TODO: Currently dbg.value for bar1 is dropped(?), is that expected?
define i32 @test1() local_unnamed_addr #0 !dbg !17 {
; CHECK-LABEL: bb.0.entry1
; CHECK-NEXT: [[REG1:%[0-9]+]]:gr64 =
; CHECK-NEXT: DBG_VALUE debug-use [[REG1]], debug-use $noreg, ![[FOO1]], !DIExpression()
entry1:
call void @llvm.dbg.value(metadata %struct.SS* @S, metadata !20, metadata !DIExpression()), !dbg !23
call void @llvm.dbg.value(metadata %struct.SS* null, metadata !22, metadata !DIExpression()), !dbg !24
ret i32 ptrtoint (%struct.SS* @S to i32), !dbg !25
}
; Verify that the def comes before the debug-use for foo2 and bar2.
define i32 @test2() local_unnamed_addr #0 !dbg !26 {
; CHECK-LABEL: bb.0.entry2
; CHECK-NEXT: [[REG2:%[0-9]+]]:gr64 =
; CHECK-NEXT: DBG_VALUE debug-use [[REG2]], debug-use $noreg, ![[FOO2]], !DIExpression()
; CHECK-NEXT: DBG_VALUE debug-use [[REG2]], debug-use $noreg, ![[BAR2]], !DIExpression()
entry2:
call void @llvm.dbg.value(metadata %struct.SS* @S, metadata !28, metadata !DIExpression()), !dbg !30
call void @llvm.dbg.value(metadata %struct.SS* @S, metadata !29, metadata !DIExpression()), !dbg !31
ret i32 add (i32 ptrtoint (%struct.SS* @S to i32), i32 ptrtoint (%struct.SS* @S to i32)), !dbg !32
}
; Verify that the def comes before the debug-use for foo3 and bar3.
define i32 @test3() local_unnamed_addr #0 !dbg !33 {
; CHECK-LABEL: bb.0.entry3
; CHECK-NEXT: [[REG3:%[0-9]+]]:gr64 =
; CHECK-NEXT: DBG_VALUE debug-use [[REG3]], debug-use $noreg, ![[BAR3]], !DIExpression()
; CHECK-NEXT: DBG_VALUE debug-use [[REG3]], debug-use $noreg, ![[FOO3]], !DIExpression()
entry3:
call void @llvm.dbg.value(metadata %struct.SS* @S, metadata !36, metadata !DIExpression()), !dbg !38
call void @llvm.dbg.value(metadata %struct.SS* @S, metadata !35, metadata !DIExpression()), !dbg !37
ret i32 add (i32 ptrtoint (%struct.SS* @S to i32), i32 ptrtoint (%struct.SS* @S to i32)), !dbg !39
}
; Verify that the def comes before the debug-use for bar4.
; TODO: Currently dbg.value for foo4 is dropped. It is set to null and not
; used. Just like in test1 it can be discussed if there should be a
; DBG_VALUE for foo4 here.
define i32 @test4() local_unnamed_addr #0 !dbg !40 {
; CHECK-LABEL: bb.0.entry4
; CHECK-NEXT: [[REG4:%[0-9]+]]:gr64 =
; CHECK-NEXT: DBG_VALUE debug-use [[REG4]], debug-use $noreg, ![[BAR4]], !DIExpression()
entry4:
call void @llvm.dbg.value(metadata %struct.SS* @S, metadata !42, metadata !DIExpression()), !dbg !44
call void @llvm.dbg.value(metadata %struct.SS* @S, metadata !43, metadata !DIExpression()), !dbg !45
call void @llvm.dbg.value(metadata %struct.SS* null, metadata !42, metadata !DIExpression()), !dbg !44
ret i32 ptrtoint (%struct.SS* @S to i32), !dbg !46
}
; Verify that we do not get a DBG_VALUE that maps foo5 to @S here.
; TODO: foo5 is set to null, and it is not really used. Just like in test1 it
; can be discussed if there should be a DBG_VALUE for foo5 here.
define i32 @test5() local_unnamed_addr #0 !dbg !47 {
; CHECK-LABEL: bb.0.entry5:
; CHECK-NEXT: [[REG5:%[0-9]+]]:gr64 =
; CHECK-NEXT: DBG_VALUE debug-use [[REG5]], debug-use $noreg, ![[BAR5]], !DIExpression()
; CHECK-NOT: DBG_VALUE debug-use [[REG5]], debug-use $noreg, ![[FOO5]], !DIExpression()
; CHECK: RET
entry5:
call void @llvm.dbg.value(metadata %struct.SS* @S, metadata !49, metadata !DIExpression()), !dbg !51
call void @llvm.dbg.value(metadata %struct.SS* @S, metadata !50, metadata !DIExpression()), !dbg !52
call void @llvm.dbg.value(metadata %struct.SS* null, metadata !50, metadata !DIExpression()), !dbg !52
ret i32 ptrtoint (%struct.SS* @S to i32), !dbg !53
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #0 = { nounwind readnone uwtable }
attributes #1 = { nounwind readnone speculatable }
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!12, !13, !14, !15}
!llvm.ident = !{!16}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "S", scope: !2, file: !3, line: 4, type: !8, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 7.0.0 (trunk 327229) (llvm/trunk 327239)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !5, globals: !7)
!3 = !DIFile(filename: "sdag-dangling-dbgvalue.c", directory: "/repo/uabbpet/llvm-master")
!4 = !{}
!5 = !{!6}
!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!7 = !{!0}
!8 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "SS", file: !3, line: 1, size: 64, elements: !9)
!9 = !{!10, !11}
!10 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !8, file: !3, line: 2, baseType: !6, size: 32)
!11 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !8, file: !3, line: 3, baseType: !6, size: 32, offset: 32)
!12 = !{i32 2, !"Dwarf Version", i32 2}
!13 = !{i32 2, !"Debug Info Version", i32 3}
!14 = !{i32 1, !"wchar_size", i32 4}
!15 = !{i32 7, !"PIC Level", i32 2}
!16 = !{!"clang version 7.0.0 (trunk 327229) (llvm/trunk 327239)"}
!17 = distinct !DISubprogram(name: "test1", scope: !3, file: !3, line: 6, type: !18, isLocal: false, isDefinition: true, scopeLine: 6, isOptimized: true, unit: !2, retainedNodes: !19)
!18 = !DISubroutineType(types: !5)
!19 = !{!20, !22}
!20 = !DILocalVariable(name: "foo1", scope: !17, file: !3, line: 7, type: !21)
!21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64)
!22 = !DILocalVariable(name: "bar1", scope: !17, file: !3, line: 8, type: !21)
!23 = !DILocation(line: 7, column: 14, scope: !17)
!24 = !DILocation(line: 8, column: 14, scope: !17)
!25 = !DILocation(line: 9, column: 3, scope: !17)
!26 = distinct !DISubprogram(name: "test2", scope: !3, file: !3, line: 12, type: !18, isLocal: false, isDefinition: true, scopeLine: 12, isOptimized: true, unit: !2, retainedNodes: !27)
!27 = !{!28, !29}
!28 = !DILocalVariable(name: "foo2", scope: !26, file: !3, line: 13, type: !21)
!29 = !DILocalVariable(name: "bar2", scope: !26, file: !3, line: 14, type: !21)
!30 = !DILocation(line: 13, column: 14, scope: !26)
!31 = !DILocation(line: 14, column: 14, scope: !26)
!32 = !DILocation(line: 15, column: 3, scope: !26)
!33 = distinct !DISubprogram(name: "test3", scope: !3, file: !3, line: 18, type: !18, isLocal: false, isDefinition: true, scopeLine: 18, isOptimized: true, unit: !2, retainedNodes: !34)
!34 = !{!35, !36}
!35 = !DILocalVariable(name: "bar3", scope: !33, file: !3, line: 19, type: !21)
!36 = !DILocalVariable(name: "foo3", scope: !33, file: !3, line: 20, type: !21)
!37 = !DILocation(line: 19, column: 14, scope: !33)
!38 = !DILocation(line: 20, column: 14, scope: !33)
!39 = !DILocation(line: 21, column: 3, scope: !33)
!40 = distinct !DISubprogram(name: "test4", scope: !3, file: !3, line: 24, type: !18, isLocal: false, isDefinition: true, scopeLine: 24, isOptimized: true, unit: !2, retainedNodes: !41)
!41 = !{!42, !43}
!42 = !DILocalVariable(name: "foo4", scope: !40, file: !3, line: 25, type: !21)
!43 = !DILocalVariable(name: "bar4", scope: !40, file: !3, line: 26, type: !21)
!44 = !DILocation(line: 25, column: 14, scope: !40)
!45 = !DILocation(line: 26, column: 14, scope: !40)
!46 = !DILocation(line: 28, column: 3, scope: !40)
!47 = distinct !DISubprogram(name: "test5", scope: !3, file: !3, line: 31, type: !18, isLocal: false, isDefinition: true, scopeLine: 31, isOptimized: true, unit: !2, retainedNodes: !48)
!48 = !{!49, !50}
!49 = !DILocalVariable(name: "bar5", scope: !47, file: !3, line: 32, type: !21)
!50 = !DILocalVariable(name: "foo5", scope: !47, file: !3, line: 33, type: !21)
!51 = !DILocation(line: 32, column: 14, scope: !47)
!52 = !DILocation(line: 33, column: 14, scope: !47)
!53 = !DILocation(line: 35, column: 3, scope: !47)
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