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a2029fa58e
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
115 lines
5.7 KiB
LLVM
115 lines
5.7 KiB
LLVM
; RUN: llc < %s -filetype=obj | llvm-dwarfdump -v -debug-info - | FileCheck %s
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; RUN: llc < %s -filetype=obj -regalloc=basic | llvm-dwarfdump -v -debug-info - | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-darwin10.0.0"
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; Check debug info for variable z_s
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; CHECK: DW_TAG_subprogram
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; CHECK: DW_TAG_subprogram
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; CHECK: DW_TAG_variable
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_location
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; CHECK-NOT: DW_{{TAG|AT}}
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; CHECK: DW_AT_name {{.*}} "z_s"
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; CHECK-NEXT: DW_AT_decl_file
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; CHECK-NEXT: DW_AT_decl_line
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; CHECK-NEXT: DW_AT_type{{.*}}{[[TYPE:.*]]}
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; CHECK: [[TYPE]]:
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; CHECK-NEXT: DW_AT_name {{.*}} "int"
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@.str1 = private unnamed_addr constant [14 x i8] c"m=%u, z_s=%d\0A\00"
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@str = internal constant [21 x i8] c"Failing test vector:\00"
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define i64 @gcd(i64 %a, i64 %b) nounwind readnone optsize noinline ssp !dbg !0 {
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entry:
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tail call void @llvm.dbg.value(metadata i64 %a, i64 0, metadata !10, metadata !DIExpression()), !dbg !18
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tail call void @llvm.dbg.value(metadata i64 %b, i64 0, metadata !11, metadata !DIExpression()), !dbg !19
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br label %while.body, !dbg !20
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while.body: ; preds = %while.body, %entry
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%b.addr.0 = phi i64 [ %b, %entry ], [ %rem, %while.body ]
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%a.addr.0 = phi i64 [ %a, %entry ], [ %b.addr.0, %while.body ]
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%rem = srem i64 %a.addr.0, %b.addr.0, !dbg !21
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%cmp = icmp eq i64 %rem, 0, !dbg !23
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br i1 %cmp, label %if.then, label %while.body, !dbg !23
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if.then: ; preds = %while.body
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tail call void @llvm.dbg.value(metadata i64 %rem, i64 0, metadata !12, metadata !DIExpression()), !dbg !21
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ret i64 %b.addr.0, !dbg !23
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}
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define i32 @main() nounwind optsize ssp !dbg !6 {
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entry:
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%call = tail call i32 @rand() nounwind optsize, !dbg !24
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tail call void @llvm.dbg.value(metadata i32 %call, i64 0, metadata !14, metadata !DIExpression()), !dbg !24
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%cmp = icmp ugt i32 %call, 21, !dbg !25
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br i1 %cmp, label %cond.true, label %cond.end, !dbg !25
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cond.true: ; preds = %entry
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%call1 = tail call i32 @rand() nounwind optsize, !dbg !25
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br label %cond.end, !dbg !25
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cond.end: ; preds = %entry, %cond.true
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%cond = phi i32 [ %call1, %cond.true ], [ %call, %entry ], !dbg !25
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tail call void @llvm.dbg.value(metadata i32 %cond, i64 0, metadata !17, metadata !DIExpression()), !dbg !25
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%conv = sext i32 %cond to i64, !dbg !26
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%conv5 = zext i32 %call to i64, !dbg !26
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%call6 = tail call i64 @gcd(i64 %conv, i64 %conv5) optsize, !dbg !26
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%cmp7 = icmp eq i64 %call6, 0
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br i1 %cmp7, label %return, label %if.then, !dbg !26
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if.then: ; preds = %cond.end
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%puts = tail call i32 @puts(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @str, i64 0, i64 0))
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%call12 = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str1, i64 0, i64 0), i32 %call, i32 %cond) nounwind optsize, !dbg !26
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ret i32 1, !dbg !27
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return: ; preds = %cond.end
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ret i32 0, !dbg !27
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}
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declare i32 @rand() optsize
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declare i32 @printf(i8* nocapture, ...) nounwind optsize
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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declare i32 @puts(i8* nocapture) nounwind
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!33}
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!0 = distinct !DISubprogram(name: "gcd", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !2, file: !31, scope: !1, type: !3, retainedNodes: !29)
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!1 = !DIFile(filename: "rem_small.c", directory: "/private/tmp")
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.9 (trunk 124117)", isOptimized: true, emissionKind: FullDebug, file: !31, enums: !32, retainedTypes: !32, imports: null)
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!3 = !DISubroutineType(types: !4)
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!4 = !{!5}
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!5 = !DIBasicType(tag: DW_TAG_base_type, name: "long int", size: 64, align: 64, encoding: DW_ATE_signed)
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!6 = distinct !DISubprogram(name: "main", line: 25, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !2, file: !31, scope: !1, type: !7, retainedNodes: !30)
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9}
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = !DILocalVariable(name: "a", line: 5, arg: 1, scope: !0, file: !1, type: !5)
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!11 = !DILocalVariable(name: "b", line: 5, arg: 2, scope: !0, file: !1, type: !5)
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!12 = !DILocalVariable(name: "c", line: 6, scope: !13, file: !1, type: !5)
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!13 = distinct !DILexicalBlock(line: 5, column: 52, file: !31, scope: !0)
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!14 = !DILocalVariable(name: "m", line: 26, scope: !15, file: !1, type: !16)
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!15 = distinct !DILexicalBlock(line: 25, column: 12, file: !31, scope: !6)
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!16 = !DIBasicType(tag: DW_TAG_base_type, name: "unsigned int", size: 32, align: 32, encoding: DW_ATE_unsigned)
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!17 = !DILocalVariable(name: "z_s", line: 27, scope: !15, file: !1, type: !9)
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!18 = !DILocation(line: 5, column: 41, scope: !0)
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!19 = !DILocation(line: 5, column: 49, scope: !0)
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!20 = !DILocation(line: 7, column: 5, scope: !13)
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!21 = !DILocation(line: 8, column: 9, scope: !22)
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!22 = distinct !DILexicalBlock(line: 7, column: 14, file: !31, scope: !13)
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!23 = !DILocation(line: 9, column: 9, scope: !22)
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!24 = !DILocation(line: 26, column: 38, scope: !15)
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!25 = !DILocation(line: 27, column: 38, scope: !15)
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!26 = !DILocation(line: 28, column: 9, scope: !15)
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!27 = !DILocation(line: 30, column: 1, scope: !15)
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!29 = !{!10, !11, !12}
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!30 = !{!14, !17}
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!31 = !DIFile(filename: "rem_small.c", directory: "/private/tmp")
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!32 = !{}
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!33 = !{i32 1, !"Debug Info Version", i32 3}
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