1 files changed, 153 insertions, 0 deletions
diff --git a/llvm/test/DebugInfo/live-debug-values.ll b/llvm/test/DebugInfo/live-debug-values.ll
new file mode 100644
index 00000000000..8a9f16eb6d6
--- /dev/null
+++ b/llvm/test/DebugInfo/live-debug-values.ll
@@ -0,0 +1,153 @@
+; 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:argv <- %RSI
+; CHECK-NEXT:  #DEBUG_VALUE: main:n <- %EBX
+
+
+; ModuleID = 'LiveDebugValues.c'
+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
+@.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 !4 {
+entry:
+  tail call void @llvm.dbg.value(metadata i32 %argc, i64 0, metadata !12, metadata !20), !dbg !21
+  tail call void @llvm.dbg.value(metadata i8** %argv, i64 0, metadata !13, 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) #4, !dbg !32
+  tail call void @llvm.dbg.value(metadata i32 %call, i64 0, metadata !14, metadata !20), !dbg !33
+  br label %if.end
+
+if.end:                                           ; preds = %entry, %if.else
+  %n.0 = phi i32 [ %call, %if.else ], [ 2, %entry ]
+  %call1 = tail call i32 @change(i32 %n.0) #4, !dbg !34
+  tail call void @llvm.dbg.value(metadata i32 %call1, i64 0, metadata !14, 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) #4, !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) #4, !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) #4, !dbg !46
+  ret i32 0, !dbg !47
+}
+
+declare i32 @atoi(...) #1
+
+declare i32 @change(i32) #1
+
+declare i32 @modify(i32) #1
+
+declare i32 @inc(i32) #1
+
+; Function Attrs: nounwind
+declare i32 @printf(i8* nocapture readonly, ...) #2
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3
+
+attributes #0 = { nounwind uwtable }
+attributes #1 = { nounwind }
+attributes #2 = { nounwind }
+attributes #3 = { nounwind readnone }
+attributes #4 = { nounwind }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!17, !18}
+!llvm.ident = !{!19}
+
+!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)
+!1 = !DIFile(filename: "LiveDebugValues.c", directory: "/home/vt/julia/test/tvvikram")
+!2 = !{}
+!3 = !{!4}
+!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)
+!5 = !DISubroutineType(types: !6)
+!6 = !{!7, !7, !8}
+!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64, align: 64)
+!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64, align: 64)
+!10 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
+!11 = !{!12, !13, !14}
+!12 = !DILocalVariable(name: "argc", arg: 1, scope: !4, file: !1, line: 6, type: !7)
+!13 = !DILocalVariable(name: "argv", arg: 2, scope: !4, file: !1, line: 6, type: !8)
+!14 = !DILocalVariable(name: "n", scope: !4, file: !1, line: 7, type: !7)
+!15 = !{!16}
+!16 = !DIGlobalVariable(name: "m", scope: !0, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true, variable: i32* @m)
+!17 = !{i32 2, !"Dwarf Version", i32 4}
+!18 = !{i32 2, !"Debug Info Version", i32 3}
+!19 = !{!"clang version 3.8.0 (trunk 253049) "}
+!20 = !DIExpression()
+!21 = !DILocation(line: 6, column: 14, scope: !4)
+!22 = !DILocation(line: 6, column: 27, scope: !23)
+!23 = !DILexicalBlockFile(scope: !4, file: !1, discriminator: 1)
+!24 = !DILocation(line: 8, column: 12, scope: !25)
+!25 = distinct !DILexicalBlock(scope: !4, file: !1, line: 8, column: 7)
+!26 = !DILocation(line: 8, column: 7, scope: !4)
+!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: !4)
+!35 = !DILocation(line: 13, column: 9, scope: !36)
+!36 = distinct !DILexicalBlock(scope: !4, file: !1, line: 13, column: 7)
+!37 = !DILocation(line: 13, column: 7, scope: !4)
+!38 = !DILocation(line: 14, column: 9, scope: !39)
+!39 = distinct !DILexicalBlock(scope: !36, file: !1, 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: !4)
+!47 = !DILocation(line: 20, column: 3, scope: !4)