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llvm-mirror/test/DebugInfo/X86/live-debug-values.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

159 lines
6.6 KiB
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; RUN: llc -filetype=asm %s -o - | FileCheck %s
; Test the extension of debug ranges from predecessors.
; Generated from the source file LiveDebugValues.c:
; #include <stdio.h>
; int m;
; extern int inc(int n);
; extern int change(int n);
; extern int modify(int n);
; int main(int argc, char **argv) {
; int n;
; if (argc != 2)
; n = 2;
; else
; n = atoi(argv[1]);
; n = change(n);
; if (n > 10) {
; m = modify(n);
; m = m + n; // var `m' doesn't has a dbg.value
; }
; else
; m = inc(n); // var `m' doesn't has a dbg.value
; printf("m(main): %d\n", m);
; return 0;
; }
; with clang -g -O3 -emit-llvm -c LiveDebugValues.c -S -o live-debug-values.ll
; This case will also produce multiple locations but only the debug range
; extension is tested here.
; DBG_VALUE for variable "n" is extended into %bb.5 from its predecessors %bb.3
; and %bb.4.
; CHECK: .LBB0_5:
; CHECK-NEXT: #DEBUG_VALUE: main:n <- $ebx
; Other register values have been clobbered.
; CHECK-NOT: #DEBUG_VALUE:
; CHECK: movl %ecx, m(%rip)
; ModuleID = 'LiveDebugValues.c'
source_filename = "test/DebugInfo/X86/live-debug-values.ll"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@m = common global i32 0, align 4, !dbg !0
@.str = private unnamed_addr constant [13 x i8] c"m(main): %d\0A\00", align 1
; Function Attrs: nounwind uwtable
define i32 @main(i32 %argc, i8** nocapture readonly %argv) #0 !dbg !10 {
entry:
tail call void @llvm.dbg.value(metadata i32 %argc, metadata !17, metadata !20), !dbg !21
tail call void @llvm.dbg.value(metadata i8** %argv, metadata !18, metadata !20), !dbg !22
%cmp = icmp eq i32 %argc, 2, !dbg !24
br i1 %cmp, label %if.else, label %if.end, !dbg !26
if.else: ; preds = %entry
%arrayidx = getelementptr inbounds i8*, i8** %argv, i64 1, !dbg !27
%0 = load i8*, i8** %arrayidx, align 8, !dbg !27, !tbaa !28
%call = tail call i32 (i8*, ...) bitcast (i32 (...)* @atoi to i32 (i8*, ...)*)(i8* %0) #1, !dbg !32
tail call void @llvm.dbg.value(metadata i32 %call, metadata !19, metadata !20), !dbg !33
br label %if.end
if.end: ; preds = %if.else, %entry
%n.0 = phi i32 [ %call, %if.else ], [ 2, %entry ]
%call1 = tail call i32 @change(i32 %n.0) #1, !dbg !34
tail call void @llvm.dbg.value(metadata i32 %call1, metadata !19, metadata !20), !dbg !33
%cmp2 = icmp sgt i32 %call1, 10, !dbg !35
br i1 %cmp2, label %if.then.3, label %if.else.5, !dbg !37
if.then.3: ; preds = %if.end
%call4 = tail call i32 @modify(i32 %call1) #1, !dbg !38
%add = add nsw i32 %call4, %call1, !dbg !40
br label %if.end.7, !dbg !41
if.else.5: ; preds = %if.end
%call6 = tail call i32 @inc(i32 %call1) #1, !dbg !42
br label %if.end.7
if.end.7: ; preds = %if.else.5, %if.then.3
%storemerge = phi i32 [ %call6, %if.else.5 ], [ %add, %if.then.3 ]
store i32 %storemerge, i32* @m, align 4, !dbg !43, !tbaa !44
%call8 = tail call i32 (i8*, ...) @printf(i8* nonnull getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0), i32 %storemerge) #1, !dbg !46
ret i32 0, !dbg !47
}
; Function Attrs: nounwind
declare i32 @atoi(...) #1
; Function Attrs: nounwind
declare i32 @change(i32) #1
; Function Attrs: nounwind
declare i32 @modify(i32) #1
; Function Attrs: nounwind
declare i32 @inc(i32) #1
; Function Attrs: nounwind
declare i32 @printf(i8* nocapture readonly, ...) #1
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
attributes #0 = { nounwind uwtable }
attributes #1 = { nounwind }
attributes #2 = { nounwind readnone }
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!7, !8}
!llvm.ident = !{!9}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = !DIGlobalVariable(name: "m", scope: !2, file: !3, line: 2, type: !6, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 3.8.0 (trunk 253049) ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
!3 = !DIFile(filename: "LiveDebugValues.c", directory: "/home/vt/julia/test/tvvikram")
!4 = !{}
!5 = !{!0}
!6 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!7 = !{i32 2, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{!"clang version 3.8.0 (trunk 253049) "}
!10 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 6, type: !11, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !16)
!11 = !DISubroutineType(types: !12)
!12 = !{!6, !6, !13}
!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64, align: 64)
!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 64, align: 64)
!15 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
!16 = !{!17, !18, !19}
!17 = !DILocalVariable(name: "argc", arg: 1, scope: !10, file: !3, line: 6, type: !6)
!18 = !DILocalVariable(name: "argv", arg: 2, scope: !10, file: !3, line: 6, type: !13)
!19 = !DILocalVariable(name: "n", scope: !10, file: !3, line: 7, type: !6)
!20 = !DIExpression()
!21 = !DILocation(line: 6, column: 14, scope: !10)
!22 = !DILocation(line: 6, column: 27, scope: !23)
!23 = !DILexicalBlockFile(scope: !10, file: !3, discriminator: 1)
!24 = !DILocation(line: 8, column: 12, scope: !25)
!25 = distinct !DILexicalBlock(scope: !10, file: !3, line: 8, column: 7)
!26 = !DILocation(line: 8, column: 7, scope: !10)
!27 = !DILocation(line: 11, column: 14, scope: !25)
!28 = !{!29, !29, i64 0}
!29 = !{!"any pointer", !30, i64 0}
!30 = !{!"omnipotent char", !31, i64 0}
!31 = !{!"Simple C/C++ TBAA"}
!32 = !DILocation(line: 11, column: 9, scope: !25)
!33 = !DILocation(line: 7, column: 7, scope: !23)
!34 = !DILocation(line: 12, column: 7, scope: !10)
!35 = !DILocation(line: 13, column: 9, scope: !36)
!36 = distinct !DILexicalBlock(scope: !10, file: !3, line: 13, column: 7)
!37 = !DILocation(line: 13, column: 7, scope: !10)
!38 = !DILocation(line: 14, column: 9, scope: !39)
!39 = distinct !DILexicalBlock(scope: !36, file: !3, line: 13, column: 15)
!40 = !DILocation(line: 15, column: 11, scope: !39)
!41 = !DILocation(line: 16, column: 3, scope: !39)
!42 = !DILocation(line: 18, column: 9, scope: !36)
!43 = !DILocation(line: 15, column: 7, scope: !39)
!44 = !{!45, !45, i64 0}
!45 = !{!"int", !30, i64 0}
!46 = !DILocation(line: 19, column: 3, scope: !10)
!47 = !DILocation(line: 20, column: 3, scope: !10)
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