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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
85 lines
3.6 KiB
LLVM
85 lines
3.6 KiB
LLVM
; RUN: llc -filetype=asm -asm-verbose=0 < %s | FileCheck %s
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; "1" from line 09 in the snippet below shouldn't be marked with location of "1"
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; from line 04. Instead it will have location inside main() (real location is
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; just erased, so it won't be perfectly accurate).
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; options: -g -O3
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; 01 volatile int x;
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; 02 int y;
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; 03 static __attribute__((always_inline)) int f1() {
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; 04 if (x * 3 < 14) return 1;
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; 05 return 2;
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; 06 }
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; 07 int main() {
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; 08 x = f1();
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; 09 x = x ? 1 : 2;
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; 10 }
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source_filename = "test/DebugInfo/X86/inlined-indirect-value.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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@x = common global i32 0, align 4, !dbg !0
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@y = common global i32 0, align 4, !dbg !6
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define i32 @main() !dbg !12 {
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; CHECK: .loc 1 {{[89]}}
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; CHECK-NOT: .loc
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; CHECK: movl $1
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entry:
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%0 = load volatile i32, i32* @x, align 4, !dbg !15, !tbaa !19
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%mul.i = mul nsw i32 %0, 3, !dbg !23
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%cmp.i = icmp slt i32 %mul.i, 14, !dbg !24
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%..i = select i1 %cmp.i, i32 1, i32 2, !dbg !25
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store volatile i32 %..i, i32* @x, align 4, !dbg !27, !tbaa !19
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%1 = load volatile i32, i32* @x, align 4, !dbg !28, !tbaa !19
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%tobool = icmp ne i32 %1, 0, !dbg !28
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br i1 %tobool, label %select.end, label %select.mid
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select.mid: ; preds = %entry
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br label %select.end
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select.end: ; preds = %select.mid, %entry
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%cond = phi i32 [ 1, %entry ], [ 2, %select.mid ]
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store volatile i32 %cond, i32* @x, align 4, !dbg !29, !tbaa !19
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ret i32 0, !dbg !30
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}
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!10, !11}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = !DIGlobalVariable(name: "x", scope: !2, file: !3, line: 1, type: !9, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !4, globals: !5, imports: !4)
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!3 = !DIFile(filename: "inline-break.c", directory: "/build/dir")
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!4 = !{}
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!5 = !{!0, !6}
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!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
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!7 = !DIGlobalVariable(name: "y", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
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!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !8)
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!10 = !{i32 2, !"Dwarf Version", i32 4}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 7, type: !13, isLocal: false, isDefinition: true, scopeLine: 7, isOptimized: true, unit: !2, retainedNodes: !4)
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!13 = !DISubroutineType(types: !14)
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!14 = !{!8}
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!15 = !DILocation(line: 4, column: 9, scope: !16, inlinedAt: !18)
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!16 = distinct !DILexicalBlock(scope: !17, file: !3, line: 4, column: 9)
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!17 = distinct !DISubprogram(name: "f1", scope: !3, file: !3, line: 3, type: !13, isLocal: true, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !2, retainedNodes: !4)
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!18 = distinct !DILocation(line: 8, column: 9, scope: !12)
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!19 = !{!20, !20, i64 0}
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!20 = !{!"int", !21, i64 0}
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!21 = !{!"omnipotent char", !22, i64 0}
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!22 = !{!"Simple C/C++ TBAA"}
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!23 = !DILocation(line: 4, column: 11, scope: !16, inlinedAt: !18)
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!24 = !DILocation(line: 4, column: 15, scope: !16, inlinedAt: !18)
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!25 = !DILocation(line: 4, column: 21, scope: !26, inlinedAt: !18)
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!26 = !DILexicalBlockFile(scope: !16, file: !3, discriminator: 1)
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!27 = !DILocation(line: 8, column: 7, scope: !12)
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!28 = !DILocation(line: 9, column: 9, scope: !12)
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!29 = !DILocation(line: 9, column: 7, scope: !12)
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!30 = !DILocation(line: 10, column: 1, scope: !12)
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