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llvm-mirror/test/DebugInfo/COFF/lexicalblock.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

329 lines
13 KiB
LLVM
Raw Blame History

; RUN: llc < %s -filetype=obj | llvm-readobj - -codeview | FileCheck %s
;
; -- lexicablock.cxx begin ----------------------------------------------------
; int main(int argc, char *argv[]) {
; int localA = 1;
;
; { // S_BLOCK32 not emitted because it has multiple address ranges.
; int localB = 2;
;
; if (__builtin_expect(argc != 1, 0)) { // S_BLOCK32 containing 'localC'
; int localC = 3;
; }
; }
;
; { // S_BLOCK32 containing 'localD'
; int localD = 4;
; localA = localD;
; }
;
; { // S_BLOCK32 not emitted
; { // S_BLOCK32 containing 'localE'
; int localE = 5;
; localA = localE;
; }
; }
;
; { // S_BLOCK32 containing 'localF'
; int localF = 6;
; localA = localF;
;
; { // S_BLOCK32 containing 'localG'
; int localG = 7;
; localA = localG;
; }
; }
;
; if (localA == 7) { // S_BLOCK32 containing 'localH'
; int localH = 8;
; localA = localH;
; }
;
; return localA != 8 ? -1 : 0;
; }
; -- lexicalblock.cxx end -----------------------------------------------------
;
; To regenerate the IR below:
; $ clang -cc1 -triple i686-pc-windows -emit-llvm -o lexicalblock.tmp -debug-info-kind=limited -gcodeview lexicablock.cxx -O1 -disable-llvm-passes
; $ opt -lower-expect -S -o lexicalblock.ll < lexicalblock.tmp
;
; The commands above split the lexical block containing localB and localC into
; two parts, thus creating multiple ranges for the containing lexical block
; without optimizing out the whole thing.
;
; CHECK: {{.*}}Proc{{.*}}Sym {
; CHECK: DisplayName: main
; CHECK: }
; CHECK: LocalSym {
; CHECK: VarName: argc
; CHECK: }
; CHECK: LocalSym {
; CHECK: VarName: argv
; CHECK: }
; CHECK: LocalSym {
; CHECK: VarName: localA
; CHECK: }
; CHECK: LocalSym {
; CHECK: VarName: localB
; CHECK: }
; CHECK: BlockSym {
; CHECK: Kind: S_BLOCK32 {{.*}}
; CHECK: BlockName:
; CHECK: }
; CHECK: LocalSym {
; CHECK: VarName: localC
; CHECK: }
; CHECK: ScopeEndSym {
; CHECK: Kind: S_END {{.*}}
; CHECK: }
; CHECK: BlockSym {
; CHECK: Kind: S_BLOCK32 {{.*}}
; CHECK: BlockName:
; CHECK: }
; CHECK: LocalSym {
; CHECK: VarName: localD
; CHECK: }
; CHECK: ScopeEndSym {
; CHECK: Kind: S_END {{.*}}
; CHECK: }
; CHECK: BlockSym {
; CHECK: Kind: S_BLOCK32 {{.*}}
; CHECK: BlockName:
; CHECK: }
; CHECK: LocalSym {
; CHECK: VarName: localE
; CHECK: }
; CHECK: ScopeEndSym {
; CHECK: }
; CHECK: BlockSym {
; CHECK: Kind: S_BLOCK32 {{.*}}
; CHECK: BlockName:
; CHECK: }
; CHECK: LocalSym {
; CHECK: VarName: localF
; CHECK: }
; CHECK: BlockSym {
; CHECK: Kind: S_BLOCK32 {{.*}}
; CHECK: BlockName:
; CHECK: }
; CHECK: LocalSym {
; CHECK: VarName: localG
; CHECK: }
; CHECK: ScopeEndSym {
; CHECK: Kind: S_END {{.*}}
; CHECK: }
; CHECK: ScopeEndSym {
; CHECK: Kind: S_END {{.*}}
; CHECK: }
; CHECK: BlockSym {
; CHECK: Kind: S_BLOCK32 {{.*}}
; CHECK: BlockName:
; CHECK: }
; CHECK: LocalSym {
; CHECK: VarName: localH
; CHECK: }
; CHECK: ScopeEndSym {
; CHECK: Kind: S_END {{.*}}
; CHECK: }
; CHECK: ProcEnd {
; CHECK: }
;
; ModuleID = 'lexicalblock.cxx'
source_filename = "lexicalblock.cxx"
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i686-pc-windows-msvc"
; Function Attrs: norecurse nounwind
define i32 @main(i32 %argc, i8** %argv) #0 !dbg !8 {
entry:
%retval = alloca i32, align 4
%argv.addr = alloca i8**, align 4
%argc.addr = alloca i32, align 4
%localA = alloca i32, align 4
%localB = alloca i32, align 4
%localC = alloca i32, align 4
%localD = alloca i32, align 4
%localE = alloca i32, align 4
%localF = alloca i32, align 4
%localG = alloca i32, align 4
%localH = alloca i32, align 4
store i32 0, i32* %retval, align 4
store i8** %argv, i8*** %argv.addr, align 4, !tbaa !37
call void @llvm.dbg.declare(metadata i8*** %argv.addr, metadata !17, metadata !DIExpression()), !dbg !41
store i32 %argc, i32* %argc.addr, align 4, !tbaa !42
call void @llvm.dbg.declare(metadata i32* %argc.addr, metadata !18, metadata !DIExpression()), !dbg !41
%0 = bitcast i32* %localA to i8*, !dbg !44
call void @llvm.lifetime.start.p0i8(i64 4, i8* %0) #4, !dbg !44
call void @llvm.dbg.declare(metadata i32* %localA, metadata !19, metadata !DIExpression()), !dbg !44
store i32 1, i32* %localA, align 4, !dbg !44, !tbaa !42
%1 = bitcast i32* %localB to i8*, !dbg !45
call void @llvm.lifetime.start.p0i8(i64 4, i8* %1) #4, !dbg !45
call void @llvm.dbg.declare(metadata i32* %localB, metadata !20, metadata !DIExpression()), !dbg !45
store i32 2, i32* %localB, align 4, !dbg !45, !tbaa !42
%2 = load i32, i32* %argc.addr, align 4, !dbg !46, !tbaa !42
%cmp = icmp ne i32 %2, 1, !dbg !46
%conv = zext i1 %cmp to i32, !dbg !46
%tobool = icmp ne i32 %conv, 0, !dbg !46
br i1 %tobool, label %if.then, label %if.end, !dbg !46, !prof !47
if.then: ; preds = %entry
%3 = bitcast i32* %localC to i8*, !dbg !48
call void @llvm.lifetime.start.p0i8(i64 4, i8* %3) #4, !dbg !48
call void @llvm.dbg.declare(metadata i32* %localC, metadata !22, metadata !DIExpression()), !dbg !48
store i32 3, i32* %localC, align 4, !dbg !48, !tbaa !42
%4 = bitcast i32* %localC to i8*, !dbg !49
call void @llvm.lifetime.end.p0i8(i64 4, i8* %4) #4, !dbg !49
br label %if.end, !dbg !49
if.end: ; preds = %if.then, %entry
%5 = bitcast i32* %localB to i8*, !dbg !50
call void @llvm.lifetime.end.p0i8(i64 4, i8* %5) #4, !dbg !50
%6 = bitcast i32* %localD to i8*, !dbg !51
call void @llvm.lifetime.start.p0i8(i64 4, i8* %6) #4, !dbg !51
call void @llvm.dbg.declare(metadata i32* %localD, metadata !25, metadata !DIExpression()), !dbg !51
store i32 4, i32* %localD, align 4, !dbg !51, !tbaa !42
%7 = load i32, i32* %localD, align 4, !dbg !52, !tbaa !42
store i32 %7, i32* %localA, align 4, !dbg !52, !tbaa !42
%8 = bitcast i32* %localD to i8*, !dbg !53
call void @llvm.lifetime.end.p0i8(i64 4, i8* %8) #4, !dbg !53
%9 = bitcast i32* %localE to i8*, !dbg !54
call void @llvm.lifetime.start.p0i8(i64 4, i8* %9) #4, !dbg !54
call void @llvm.dbg.declare(metadata i32* %localE, metadata !27, metadata !DIExpression()), !dbg !54
store i32 5, i32* %localE, align 4, !dbg !54, !tbaa !42
%10 = load i32, i32* %localE, align 4, !dbg !55, !tbaa !42
store i32 %10, i32* %localA, align 4, !dbg !55, !tbaa !42
%11 = bitcast i32* %localE to i8*, !dbg !56
call void @llvm.lifetime.end.p0i8(i64 4, i8* %11) #4, !dbg !56
%12 = bitcast i32* %localF to i8*, !dbg !57
call void @llvm.lifetime.start.p0i8(i64 4, i8* %12) #4, !dbg !57
call void @llvm.dbg.declare(metadata i32* %localF, metadata !30, metadata !DIExpression()), !dbg !57
store i32 6, i32* %localF, align 4, !dbg !57, !tbaa !42
%13 = load i32, i32* %localF, align 4, !dbg !58, !tbaa !42
store i32 %13, i32* %localA, align 4, !dbg !58, !tbaa !42
%14 = bitcast i32* %localG to i8*, !dbg !59
call void @llvm.lifetime.start.p0i8(i64 4, i8* %14) #4, !dbg !59
call void @llvm.dbg.declare(metadata i32* %localG, metadata !32, metadata !DIExpression()), !dbg !59
store i32 7, i32* %localG, align 4, !dbg !59, !tbaa !42
%15 = load i32, i32* %localG, align 4, !dbg !60, !tbaa !42
store i32 %15, i32* %localA, align 4, !dbg !60, !tbaa !42
%16 = bitcast i32* %localG to i8*, !dbg !61
call void @llvm.lifetime.end.p0i8(i64 4, i8* %16) #4, !dbg !61
%17 = bitcast i32* %localF to i8*, !dbg !62
call void @llvm.lifetime.end.p0i8(i64 4, i8* %17) #4, !dbg !62
%18 = load i32, i32* %localA, align 4, !dbg !63, !tbaa !42
%cmp1 = icmp eq i32 %18, 7, !dbg !63
br i1 %cmp1, label %if.then2, label %if.end3, !dbg !63
if.then2: ; preds = %if.end
%19 = bitcast i32* %localH to i8*, !dbg !64
call void @llvm.lifetime.start.p0i8(i64 4, i8* %19) #4, !dbg !64
call void @llvm.dbg.declare(metadata i32* %localH, metadata !34, metadata !DIExpression()), !dbg !64
store i32 8, i32* %localH, align 4, !dbg !64, !tbaa !42
%20 = load i32, i32* %localH, align 4, !dbg !65, !tbaa !42
store i32 %20, i32* %localA, align 4, !dbg !65, !tbaa !42
%21 = bitcast i32* %localH to i8*, !dbg !66
call void @llvm.lifetime.end.p0i8(i64 4, i8* %21) #4, !dbg !66
br label %if.end3, !dbg !66
if.end3: ; preds = %if.then2, %if.end
%22 = load i32, i32* %localA, align 4, !dbg !67, !tbaa !42
%cmp4 = icmp ne i32 %22, 8, !dbg !67
%23 = zext i1 %cmp4 to i64, !dbg !67
%cond = select i1 %cmp4, i32 -1, i32 0, !dbg !67
%24 = bitcast i32* %localA to i8*, !dbg !68
call void @llvm.lifetime.end.p0i8(i64 4, i8* %24) #4, !dbg !68
ret i32 %cond, !dbg !67
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #2
; Function Attrs: nounwind readnone
declare i32 @llvm.expect.i32(i32, i32) #3
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #2
attributes #0 = { norecurse nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-features"="+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone speculatable }
attributes #2 = { argmemonly nounwind }
attributes #3 = { nounwind readnone }
attributes #4 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5, !6}
!llvm.ident = !{!7}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 7.0.0 (trunk)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "<stdin>", directory: "C:/path/to/directory", checksumkind: CSK_MD5, checksum: "169b810b4f895de9a9e19d8d0634af5d")
!2 = !{}
!3 = !{i32 1, !"NumRegisterParameters", i32 0}
!4 = !{i32 2, !"CodeView", i32 1}
!5 = !{i32 2, !"Debug Info Version", i32 3}
!6 = !{i32 1, !"wchar_size", i32 2}
!7 = !{!"clang version 7.0.0 (trunk)"}
!8 = distinct !DISubprogram(name: "main", scope: !9, file: !9, line: 1, type: !10, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !16)
!9 = !DIFile(filename: "lexicalblock.cxx", directory: "C:/path/to/directory", checksumkind: CSK_MD5, checksum: "169b810b4f895de9a9e19d8d0634af5d")
!10 = !DISubroutineType(types: !11)
!11 = !{!12, !12, !13}
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 32)
!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 32)
!15 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!16 = !{!17, !18, !19, !20, !22, !25, !27, !30, !32, !34}
!17 = !DILocalVariable(name: "argv", arg: 2, scope: !8, file: !9, line: 1, type: !13)
!18 = !DILocalVariable(name: "argc", arg: 1, scope: !8, file: !9, line: 1, type: !12)
!19 = !DILocalVariable(name: "localA", scope: !8, file: !9, line: 2, type: !12)
!20 = !DILocalVariable(name: "localB", scope: !21, file: !9, line: 5, type: !12)
!21 = distinct !DILexicalBlock(scope: !8, file: !9, line: 4)
!22 = !DILocalVariable(name: "localC", scope: !23, file: !9, line: 8, type: !12)
!23 = distinct !DILexicalBlock(scope: !24, file: !9, line: 7)
!24 = distinct !DILexicalBlock(scope: !21, file: !9, line: 7)
!25 = !DILocalVariable(name: "localD", scope: !26, file: !9, line: 13, type: !12)
!26 = distinct !DILexicalBlock(scope: !8, file: !9, line: 12)
!27 = !DILocalVariable(name: "localE", scope: !28, file: !9, line: 19, type: !12)
!28 = distinct !DILexicalBlock(scope: !29, file: !9, line: 18)
!29 = distinct !DILexicalBlock(scope: !8, file: !9, line: 17)
!30 = !DILocalVariable(name: "localF", scope: !31, file: !9, line: 25, type: !12)
!31 = distinct !DILexicalBlock(scope: !8, file: !9, line: 24)
!32 = !DILocalVariable(name: "localG", scope: !33, file: !9, line: 29, type: !12)
!33 = distinct !DILexicalBlock(scope: !31, file: !9, line: 28)
!34 = !DILocalVariable(name: "localH", scope: !35, file: !9, line: 35, type: !12)
!35 = distinct !DILexicalBlock(scope: !36, file: !9, line: 34)
!36 = distinct !DILexicalBlock(scope: !8, file: !9, line: 34)
!37 = !{!38, !38, i64 0}
!38 = !{!"any pointer", !39, i64 0}
!39 = !{!"omnipotent char", !40, i64 0}
!40 = !{!"Simple C++ TBAA"}
!41 = !DILocation(line: 1, scope: !8)
!42 = !{!43, !43, i64 0}
!43 = !{!"int", !39, i64 0}
!44 = !DILocation(line: 2, scope: !8)
!45 = !DILocation(line: 5, scope: !21)
!46 = !DILocation(line: 7, scope: !21)
!47 = !{!"branch_weights", i32 1, i32 2000}
!48 = !DILocation(line: 8, scope: !23)
!49 = !DILocation(line: 9, scope: !23)
!50 = !DILocation(line: 10, scope: !21)
!51 = !DILocation(line: 13, scope: !26)
!52 = !DILocation(line: 14, scope: !26)
!53 = !DILocation(line: 15, scope: !26)
!54 = !DILocation(line: 19, scope: !28)
!55 = !DILocation(line: 20, scope: !28)
!56 = !DILocation(line: 21, scope: !28)
!57 = !DILocation(line: 25, scope: !31)
!58 = !DILocation(line: 26, scope: !31)
!59 = !DILocation(line: 29, scope: !33)
!60 = !DILocation(line: 30, scope: !33)
!61 = !DILocation(line: 31, scope: !33)
!62 = !DILocation(line: 32, scope: !31)
!63 = !DILocation(line: 34, scope: !8)
!64 = !DILocation(line: 35, scope: !35)
!65 = !DILocation(line: 36, scope: !35)
!66 = !DILocation(line: 37, scope: !35)
!67 = !DILocation(line: 39, scope: !8)
!68 = !DILocation(line: 40, scope: !8)
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