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062efd8b18
LiveDebugVariables unconditionally propagates all DBG_VALUE down the dominator tree, which happens to work fine if there already is another DBG_VALUE or the DBG_VALUE happends to describe a single-assignment vreg but is otherwise wrong if the DBG_VALUE is coming from only one of the predecessors. In r255759 we introduced a proper data flow analysis scheduled after LiveDebugVariables that correctly propagates DBG_VALUEs across basic block boundaries. With the new pass in place, the incorrect propagation in LiveDebugVariables can be retired witout loosing any of the benefits where LiveDebugVariables happened to do the right thing. llvm-svn: 256188
153 lines
6.4 KiB
LLVM
153 lines
6.4 KiB
LLVM
; RUN: llc -filetype=asm %s -o - | 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 -emit-llvm -c LiveDebugValues.c -S -o live-debug-values.ll
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; This case will also produce multiple locations but only the debug range
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; extension is tested here.
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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: .LBB0_5:
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; CHECK-NEXT: #DEBUG_VALUE: main:n <- %EBX
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; CHECK-NEXT: #DEBUG_VALUE: main:argv <- %RSI
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; ModuleID = 'LiveDebugValues.c'
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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
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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 = %entry, %if.else
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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: 1, enums: !2, subprograms: !3, 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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!3 = !{!4}
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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, variables: !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 = !DIGlobalVariable(name: "m", scope: !0, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true, variable: i32* @m)
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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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