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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
134 lines
5.6 KiB
LLVM
134 lines
5.6 KiB
LLVM
; RUN: llc -O0 < %s | FileCheck %s
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source_filename = "t.c"
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target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
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target triple = "i386-pc-windows-msvc19.0.24215"
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@str_const = internal unnamed_addr constant [4 x i8] c"str\00", align 1
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declare i32 @puts(i8*)
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declare void @use_i32(i32*)
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declare void @llvm.dbg.value(metadata, metadata, metadata) nounwind readnone
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; We had a line info quality issue where the LEA for the string constant had no
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; location info, so the .cv_loc directive appeared after it. Now we have logic
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; that tries to emit the first valid location to the top of each MBB.
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define void @lea_str_loc(i1 %cond) !dbg !8 {
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entry:
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br i1 %cond, label %if.then, label %if.end, !dbg !17
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if.then: ; preds = %entry
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br label %return, !dbg !18
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if.end: ; preds = %entry
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%call = call i32 @puts(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @str_const, i32 0, i32 0)), !dbg !19
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br label %return, !dbg !20
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return: ; preds = %if.end, %if.then
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ret void, !dbg !20
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}
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; The t.c:5 line marker should appear immediately after the BB label.
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; CHECK-LABEL: _lea_str_loc:
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; CHECK: .cv_loc {{.*}} # t.c:4:5
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; CHECK: jmp LBB{{.*}}
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; CHECK: LBB0_{{.*}}: # %if.end
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; CHECK-NEXT: .cv_loc {{.*}} # t.c:5:3
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; CHECK-NEXT: leal _str_const, %[[reg:[^ ]*]]
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; CHECK-NEXT: movl %[[reg]], (%esp)
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; CHECK-NEXT: calll _puts
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define void @instr_no_loc(i1 %cond) !dbg !21 {
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entry:
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br i1 %cond, label %if.then, label %if.end, !dbg !22
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if.then: ; preds = %entry
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br label %return, !dbg !23
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if.end: ; preds = %entry
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call void asm sideeffect "nop", ""()
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%call = call i32 @puts(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @str_const, i32 0, i32 0)), !dbg !24
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br label %return, !dbg !25
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return: ; preds = %if.end, %if.then
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ret void, !dbg !25
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}
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; CHECK-LABEL: _instr_no_loc:
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; CHECK: .cv_loc {{.*}} # t.c:4:5
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; CHECK: jmp LBB{{.*}}
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; CHECK: LBB1_{{.*}}: # %if.end
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; CHECK-NEXT: .cv_loc {{.*}} # t.c:5:3
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; CHECK-NEXT: #APP
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; CHECK-NEXT: nop
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; CHECK-NEXT: #NO_APP
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; CHECK-NEXT: leal _str_const, %[[reg:[^ ]*]]
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; CHECK-NEXT: movl %[[reg]], (%esp)
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; CHECK-NEXT: calll _puts
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define void @lea_dbg_value(i1 %cond) !dbg !30 {
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entry:
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%value = alloca i32
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store i32 42, i32* %value
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br i1 %cond, label %if.then, label %if.end, !dbg !31
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if.then: ; preds = %entry
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br label %return, !dbg !32
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if.end: ; preds = %entry
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call void @llvm.dbg.value(metadata i32* %value, metadata !35, metadata !13), !dbg !34
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call void @use_i32(i32* %value), !dbg !33
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br label %return, !dbg !34
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return: ; preds = %if.end, %if.then
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ret void, !dbg !34
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}
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; CHECK-LABEL: _lea_dbg_value:
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; CHECK: .cv_loc {{.*}} # t.c:4:5
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; CHECK: jmp LBB{{.*}}
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; CHECK: LBB2_{{.*}}: # %if.end
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; CHECK-NEXT: .cv_loc {{.*}} # t.c:5:3
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; CHECK: leal 4(%esp), %[[reg:[^ ]*]]
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; CHECK: #DEBUG_VALUE: lea_dbg_value:v <- [DW_OP_deref] $[[reg]]
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; CHECK: movl %[[reg]], (%esp)
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; CHECK: calll _use_i32
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 5.0.0 ", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "b32df088e991f1996b4e4deb3855c14b")
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!2 = !{}
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!3 = !{i32 1, !"NumRegisterParameters", i32 0}
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!4 = !{i32 2, !"CodeView", i32 1}
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!5 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = !{i32 1, !"wchar_size", i32 2}
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!7 = !{!"clang version 5.0.0 "}
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!8 = distinct !DISubprogram(name: "lea_str_loc", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null, !11}
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!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!13 = !DIExpression(DW_OP_deref)
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!14 = !DILocation(line: 2, column: 12, scope: !8)
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!15 = !DILocation(line: 3, column: 7, scope: !16)
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!16 = distinct !DILexicalBlock(scope: !8, file: !1, line: 3, column: 7)
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!17 = !DILocation(line: 3, column: 7, scope: !8)
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!18 = !DILocation(line: 4, column: 5, scope: !16)
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!19 = !DILocation(line: 5, column: 3, scope: !8)
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!20 = !DILocation(line: 6, column: 1, scope: !8)
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!21 = distinct !DISubprogram(name: "instr_no_loc", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!22 = !DILocation(line: 3, column: 7, scope: !21)
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!23 = !DILocation(line: 4, column: 5, scope: !21)
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!24 = !DILocation(line: 5, column: 3, scope: !21)
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!25 = !DILocation(line: 6, column: 1, scope: !21)
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!30 = distinct !DISubprogram(name: "lea_dbg_value", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!31 = !DILocation(line: 3, column: 7, scope: !30)
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!32 = !DILocation(line: 4, column: 5, scope: !30)
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!33 = !DILocation(line: 5, column: 3, scope: !30)
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!34 = !DILocation(line: 6, column: 1, scope: !30)
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!35 = !DILocalVariable(name: "v", scope: !30, file: !1, line: 3, type: !11)
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