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clang-p2996/llvm/test/Transforms/InstCombine/debuginfo.ll
Shiva Chen 2c864551df [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

118 lines
5.7 KiB
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; RUN: opt < %s -instcombine -instcombine-lower-dbg-declare=0 -S \
; RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=NOLOWER
; RUN: opt < %s -instcombine -instcombine-lower-dbg-declare=1 -S | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64--linux"
%struct.TwoRegs = type { i64, i64 }
declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
declare i64 @llvm.objectsize.i64.p0i8(i8*, i1) nounwind readnone
declare i8* @passthru_callee(i8*, i32, i64, i64)
define i8* @passthru(i8* %a, i32 %b, i64 %c) !dbg !1 {
entry:
%a.addr = alloca i8*, align 8
%b.addr = alloca i32, align 4
%c.addr = alloca i64, align 8
store i8* %a, i8** %a.addr, align 8
call void @llvm.dbg.declare(metadata i8** %a.addr, metadata !0, metadata !DIExpression()), !dbg !16
store i32 %b, i32* %b.addr, align 4
call void @llvm.dbg.declare(metadata i32* %b.addr, metadata !7, metadata !DIExpression()), !dbg !18
store i64 %c, i64* %c.addr, align 8
call void @llvm.dbg.declare(metadata i64* %c.addr, metadata !9, metadata !DIExpression()), !dbg !20
%tmp = load i8*, i8** %a.addr, align 8, !dbg !21
%tmp1 = load i32, i32* %b.addr, align 4, !dbg !21
%tmp2 = load i64, i64* %c.addr, align 8, !dbg !21
%tmp3 = load i8*, i8** %a.addr, align 8, !dbg !21
%0 = call i64 @llvm.objectsize.i64.p0i8(i8* %tmp3, i1 false), !dbg !21
%call = call i8* @passthru_callee(i8* %tmp, i32 %tmp1, i64 %tmp2, i64 %0), !dbg !21
ret i8* %call, !dbg !21
}
; CHECK-LABEL: define i8* @passthru(i8* %a, i32 %b, i64 %c)
; CHECK-NOT: alloca
; CHECK-NOT: store
; CHECK-NOT: call void @llvm.dbg.declare
; CHECK: call void @llvm.dbg.value(metadata i8* %a, {{.*}})
; CHECK-NOT: store
; CHECK: call void @llvm.dbg.value(metadata i32 %b, {{.*}})
; CHECK-NOT: store
; CHECK: call void @llvm.dbg.value(metadata i64 %c, {{.*}})
; CHECK-NOT: store
; CHECK: call i8* @passthru_callee(i8* %a, i32 %b, i64 %c, i64 %{{.*}})
declare void @tworegs_callee(i64, i64)
; Lowering dbg.declare in instcombine doesn't handle this case very well.
define void @tworegs(i64 %o.coerce0, i64 %o.coerce1) !dbg !31 {
entry:
%o = alloca %struct.TwoRegs, align 8
%0 = bitcast %struct.TwoRegs* %o to { i64, i64 }*
%1 = getelementptr inbounds { i64, i64 }, { i64, i64 }* %0, i32 0, i32 0
store i64 %o.coerce0, i64* %1, align 8
%2 = getelementptr inbounds { i64, i64 }, { i64, i64 }* %0, i32 0, i32 1
store i64 %o.coerce1, i64* %2, align 8
call void @llvm.dbg.declare(metadata %struct.TwoRegs* %o, metadata !35, metadata !DIExpression()), !dbg !32
%3 = bitcast %struct.TwoRegs* %o to { i64, i64 }*, !dbg !33
%4 = getelementptr inbounds { i64, i64 }, { i64, i64 }* %3, i32 0, i32 0, !dbg !33
%5 = load i64, i64* %4, align 8, !dbg !33
%6 = getelementptr inbounds { i64, i64 }, { i64, i64 }* %3, i32 0, i32 1, !dbg !33
%7 = load i64, i64* %6, align 8, !dbg !33
call void @tworegs_callee(i64 %5, i64 %7), !dbg !33
ret void, !dbg !33
}
; NOLOWER-LABEL: define void @tworegs(i64 %o.coerce0, i64 %o.coerce1)
; NOLOWER-NOT: alloca
; NOLOWER-NOT: store
; NOLOWER-NOT: call void @llvm.dbg.declare
; NOLOWER: call void @llvm.dbg.value(metadata i64 %o.coerce0, {{.*}})
; NOLOWER-NOT: store
; NOLOWER: call void @llvm.dbg.value(metadata i64 %o.coerce1, {{.*}})
; NOLOWER-NOT: store
; NOLOWER: call void @tworegs_callee(i64 %o.coerce0, i64 %o.coerce1)
!llvm.dbg.cu = !{!3}
!llvm.module.flags = !{!30}
!0 = !DILocalVariable(name: "a", line: 78, arg: 1, scope: !1, file: !2, type: !6)
!1 = distinct !DISubprogram(name: "passthru", line: 79, isLocal: true, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !3, scopeLine: 79, file: !27, scope: !2, type: !4, retainedNodes: !25)
!2 = !DIFile(filename: "string.h", directory: "Game")
!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 127710)", isOptimized: true, emissionKind: FullDebug, file: !28, enums: !29, retainedTypes: !29)
!4 = !DISubroutineType(types: !5)
!5 = !{!6}
!6 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, scope: !3, baseType: null)
!7 = !DILocalVariable(name: "b", line: 78, arg: 2, scope: !1, file: !2, type: !8)
!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!9 = !DILocalVariable(name: "c", line: 78, arg: 3, scope: !1, file: !2, type: !12)
!12 = !DIBasicType(tag: DW_TAG_base_type, name: "long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned)
!16 = !DILocation(line: 78, column: 28, scope: !1)
!18 = !DILocation(line: 78, column: 40, scope: !1)
!20 = !DILocation(line: 78, column: 54, scope: !1)
!21 = !DILocation(line: 80, column: 3, scope: !22)
!22 = distinct !DILexicalBlock(line: 80, column: 3, file: !27, scope: !23)
!23 = distinct !DILexicalBlock(line: 79, column: 1, file: !27, scope: !1)
!25 = !{!0, !7, !9}
!27 = !DIFile(filename: "string.h", directory: "Game")
!28 = !DIFile(filename: "bits.c", directory: "Game")
!29 = !{}
!30 = !{i32 1, !"Debug Info Version", i32 3}
!31 = distinct !DISubprogram(name: "tworegs", scope: !28, file: !28, line: 4, type: !4, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !3, retainedNodes: !34)
!32 = !DILocation(line: 4, column: 23, scope: !31)
!33 = !DILocation(line: 5, column: 3, scope: !31)
!34 = !{!35}
!35 = !DILocalVariable(name: "o", arg: 1, scope: !31, file: !28, line: 4, type: !36)
!36 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "TwoRegs", file: !28, line: 1, size: 128, elements: !37)
!37 = !{!38, !39}
!38 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !36, file: !28, line: 1, baseType: !12, size: 64)
!39 = !DIDerivedType(tag: DW_TAG_member, name: "y", scope: !36, file: !28, line: 1, baseType: !12, size: 64)
!40 = !DISubroutineType(types: !41)
!41 = !{!36}
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