2c864551df
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
258 lines
11 KiB
YAML
258 lines
11 KiB
YAML
# RUN: llc -run-pass=livedebugvalues -march=x86-64 -o - %s | FileCheck %s
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# Test the extension of debug ranges from predecessors.
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# Generated from the source file LiveDebugValues.c:
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# #include <stdio.h>
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# int m;
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# extern int inc(int n);
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# extern int change(int n);
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# extern int modify(int n);
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# int main(int argc, char **argv) {
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# int n;
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# if (argc != 2)
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# n = 2;
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# else
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# n = atoi(argv[1]);
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# n = change(n);
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# if (n > 10) {
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# m = modify(n);
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# m = m + n; // var `m' doesn't has a dbg.value
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# }
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# else
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# m = inc(n); // var `m' doesn't has a dbg.value
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# printf("m(main): %d\n", m);
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# return 0;
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# }
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# with clang -g -O3 -c -emit-llvm LiveDebugValues.c -S -o live-debug-values.ll
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# then llc -stop-after stackmap-liveness live-debug-values.ll -o /dev/null > live-debug-values.mir
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# This case will also produce multiple locations but only the debug range
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# extension is tested here. This test case is tested with DWARF information under
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# llvm/test/DebugInfo/live-debug-values.ll and present here for testing under
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# MIR->MIR serialization.
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# DBG_VALUE for variable "n" is extended into %bb.5 from its predecessors %bb.3
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# and %bb.4.
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# CHECK: ![[N_VAR:[0-9]+]] = !DILocalVariable(name: "n",{{.*}})
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#
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# CHECK: bb.5.if.end.7:
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# CHECK: DBG_VALUE debug-use $ebx, debug-use $noreg, ![[N_VAR]], !DIExpression(), debug-location !{{[0-9]+}}
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--- |
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; ModuleID = 'live-debug-values.ll'
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@m = common global i32 0, align 4, !dbg !16
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@.str = private unnamed_addr constant [13 x i8] c"m(main): %d\0A\00", align 1
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; Function Attrs: nounwind uwtable
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define i32 @main(i32 %argc, i8** nocapture readonly %argv) #0 !dbg !4 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %argc, i64 0, metadata !12, metadata !20), !dbg !21
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tail call void @llvm.dbg.value(metadata i8** %argv, i64 0, metadata !13, metadata !20), !dbg !22
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%cmp = icmp eq i32 %argc, 2, !dbg !24
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br i1 %cmp, label %if.else, label %if.end, !dbg !26
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if.else: ; preds = %entry
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%arrayidx = getelementptr inbounds i8*, i8** %argv, i64 1, !dbg !27
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%0 = load i8*, i8** %arrayidx, align 8, !dbg !27, !tbaa !28
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%call = tail call i32 (i8*, ...) bitcast (i32 (...)* @atoi to i32 (i8*, ...)*)(i8* %0) #4, !dbg !32
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tail call void @llvm.dbg.value(metadata i32 %call, i64 0, metadata !14, metadata !20), !dbg !33
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br label %if.end
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if.end: ; preds = %if.else, %entry
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%n.0 = phi i32 [ %call, %if.else ], [ 2, %entry ]
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%call1 = tail call i32 @change(i32 %n.0) #4, !dbg !34
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tail call void @llvm.dbg.value(metadata i32 %call1, i64 0, metadata !14, metadata !20), !dbg !33
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%cmp2 = icmp sgt i32 %call1, 10, !dbg !35
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br i1 %cmp2, label %if.then.3, label %if.else.5, !dbg !37
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if.then.3: ; preds = %if.end
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%call4 = tail call i32 @modify(i32 %call1) #4, !dbg !38
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%add = add nsw i32 %call4, %call1, !dbg !40
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br label %if.end.7, !dbg !41
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if.else.5: ; preds = %if.end
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%call6 = tail call i32 @inc(i32 %call1) #4, !dbg !42
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br label %if.end.7
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if.end.7: ; preds = %if.else.5, %if.then.3
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%storemerge = phi i32 [ %call6, %if.else.5 ], [ %add, %if.then.3 ]
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store i32 %storemerge, i32* @m, align 4, !dbg !43, !tbaa !44
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%call8 = tail call i32 (i8*, ...) @printf(i8* nonnull getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0), i32 %storemerge) #4, !dbg !46
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ret i32 0, !dbg !47
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}
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declare i32 @atoi(...) #1
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declare i32 @change(i32) #1
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declare i32 @modify(i32) #1
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declare i32 @inc(i32) #1
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; Function Attrs: nounwind
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declare i32 @printf(i8* nocapture readonly, ...) #2
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3
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attributes #0 = { nounwind uwtable }
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attributes #1 = { nounwind }
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attributes #2 = { nounwind }
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attributes #3 = { nounwind readnone }
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attributes #4 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!17, !18}
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!llvm.ident = !{!19}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 253049) ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !15)
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!1 = !DIFile(filename: "LiveDebugValues.c", directory: "/home/vt/julia/test/tvvikram")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 6, type: !5, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7, !7, !8}
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64, align: 64)
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!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64, align: 64)
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!10 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!11 = !{!12, !13, !14}
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!12 = !DILocalVariable(name: "argc", arg: 1, scope: !4, file: !1, line: 6, type: !7)
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!13 = !DILocalVariable(name: "argv", arg: 2, scope: !4, file: !1, line: 6, type: !8)
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!14 = !DILocalVariable(name: "n", scope: !4, file: !1, line: 7, type: !7)
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!15 = !{!16}
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!16 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "m", scope: !0, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true), expr: !DIExpression())
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!17 = !{i32 2, !"Dwarf Version", i32 4}
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!18 = !{i32 2, !"Debug Info Version", i32 3}
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!19 = !{!"clang version 3.8.0 (trunk 253049)"}
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!20 = !DIExpression()
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!21 = !DILocation(line: 6, column: 14, scope: !4)
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!22 = !DILocation(line: 6, column: 27, scope: !23)
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!23 = !DILexicalBlockFile(scope: !4, file: !1, discriminator: 1)
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!24 = !DILocation(line: 8, column: 12, scope: !25)
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!25 = distinct !DILexicalBlock(scope: !4, file: !1, line: 8, column: 7)
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!26 = !DILocation(line: 8, column: 7, scope: !4)
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!27 = !DILocation(line: 11, column: 14, scope: !25)
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!28 = !{!29, !29, i64 0}
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!29 = !{!"any pointer", !30, i64 0}
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!30 = !{!"omnipotent char", !31, i64 0}
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!31 = !{!"Simple C/C++ TBAA"}
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!32 = !DILocation(line: 11, column: 9, scope: !25)
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!33 = !DILocation(line: 7, column: 7, scope: !23)
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!34 = !DILocation(line: 12, column: 7, scope: !4)
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!35 = !DILocation(line: 13, column: 9, scope: !36)
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!36 = distinct !DILexicalBlock(scope: !4, file: !1, line: 13, column: 7)
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!37 = !DILocation(line: 13, column: 7, scope: !4)
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!38 = !DILocation(line: 14, column: 9, scope: !39)
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!39 = distinct !DILexicalBlock(scope: !36, file: !1, line: 13, column: 15)
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!40 = !DILocation(line: 15, column: 11, scope: !39)
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!41 = !DILocation(line: 16, column: 3, scope: !39)
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!42 = !DILocation(line: 18, column: 9, scope: !36)
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!43 = !DILocation(line: 15, column: 7, scope: !39)
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!44 = !{!45, !45, i64 0}
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!45 = !{!"int", !30, i64 0}
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!46 = !DILocation(line: 19, column: 3, scope: !4)
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!47 = !DILocation(line: 20, column: 3, scope: !4)
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...
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---
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name: main
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alignment: 4
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exposesReturnsTwice: false
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tracksRegLiveness: true
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liveins:
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- { reg: '$edi' }
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- { reg: '$rsi' }
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calleeSavedRegisters: [ '$bh', '$bl', '$bp', '$bpl', '$bx', '$ebp', '$ebx',
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'$rbp', '$rbx', '$r12', '$r13', '$r14', '$r15',
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'$r12b', '$r13b', '$r14b', '$r15b', '$r12d', '$r13d',
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'$r14d', '$r15d', '$r12w', '$r13w', '$r14w', '$r15w' ]
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 8
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offsetAdjustment: 0
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maxAlignment: 0
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adjustsStack: true
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hasCalls: true
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maxCallFrameSize: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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fixedStack:
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- { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$rbx' }
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body: |
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bb.0.entry:
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successors: %bb.1.if.else(16), %bb.2.if.end(16)
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liveins: $edi, $rsi, $rbx
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frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp
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CFI_INSTRUCTION def_cfa_offset 16
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CFI_INSTRUCTION offset $rbx, -16
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DBG_VALUE debug-use $edi, debug-use _, !12, !20, debug-location !21
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DBG_VALUE debug-use $rsi, debug-use _, !13, !20, debug-location !22
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$eax = MOV32rr $edi
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DBG_VALUE debug-use $eax, debug-use _, !12, !20, debug-location !21
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$edi = MOV32ri 2
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CMP32ri8 killed $eax, 2, implicit-def $eflags, debug-location !26
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JNE_1 %bb.2.if.end, implicit $eflags
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bb.1.if.else:
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successors: %bb.2.if.end(0)
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liveins: $rsi
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DBG_VALUE debug-use $rsi, debug-use _, !13, !20, debug-location !22
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$rdi = MOV64rm killed $rsi, 1, _, 8, _, debug-location !27 :: (load 8 from %ir.arrayidx, !tbaa !28)
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dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !32
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CALL64pcrel32 @atoi, csr_64, implicit $rsp, implicit $rdi, implicit $al, implicit-def $rsp, implicit-def $eax, debug-location !32
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$edi = MOV32rr $eax, debug-location !32
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DBG_VALUE debug-use $edi, debug-use _, !14, !20, debug-location !33
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bb.2.if.end:
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successors: %bb.3.if.then.3(16), %bb.4.if.else.5(16)
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liveins: $edi
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CALL64pcrel32 @change, csr_64, implicit $rsp, implicit $edi, implicit-def $rsp, implicit-def $eax, debug-location !34
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$ebx = MOV32rr $eax, debug-location !34
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DBG_VALUE debug-use $ebx, debug-use _, !14, !20, debug-location !33
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CMP32ri8 $ebx, 11, implicit-def $eflags, debug-location !37
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JL_1 %bb.4.if.else.5, implicit killed $eflags, debug-location !37
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bb.3.if.then.3:
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successors: %bb.5.if.end.7(0)
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liveins: $ebx
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DBG_VALUE debug-use $ebx, debug-use _, !14, !20, debug-location !33
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$edi = MOV32rr $ebx, debug-location !38
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CALL64pcrel32 @modify, csr_64, implicit $rsp, implicit $edi, implicit-def $rsp, implicit-def $eax, debug-location !38
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$ecx = MOV32rr $eax, debug-location !38
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$ecx = ADD32rr killed $ecx, killed $ebx, implicit-def dead $eflags, debug-location !40
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JMP_1 %bb.5.if.end.7
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bb.4.if.else.5:
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successors: %bb.5.if.end.7(0)
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liveins: $ebx
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DBG_VALUE debug-use $ebx, debug-use _, !14, !20, debug-location !33
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$edi = MOV32rr killed $ebx, debug-location !42
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CALL64pcrel32 @inc, csr_64, implicit $rsp, implicit $edi, implicit-def $rsp, implicit-def $eax, debug-location !42
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$ecx = MOV32rr $eax, debug-location !42
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bb.5.if.end.7:
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liveins: $ecx
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MOV32mr $rip, 1, _, @m, _, $ecx, debug-location !43 :: (store 4 into @m, !tbaa !44)
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dead undef $edi = MOV32ri64 @.str, implicit-def $rdi, debug-location !46
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dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !47
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$esi = MOV32rr killed $ecx, debug-location !46
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CALL64pcrel32 @printf, csr_64, implicit $rsp, implicit $rdi, implicit $esi, implicit $al, implicit-def $rsp, implicit-def dead $eax, debug-location !46
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$eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, debug-location !47
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$rbx = POP64r implicit-def $rsp, implicit $rsp, debug-location !47
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RETQ $eax, debug-location !47
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...
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