2c864551df
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
101 lines
4.1 KiB
LLVM
101 lines
4.1 KiB
LLVM
; RUN: llc -mtriple=x86_64-apple-macosx10.9.0 %s -stop-after=livedebugvars \
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; RUN: -o - | FileCheck %s
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; Generated from:
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; void g(int *);
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; int f() {
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; int x = 23;
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; g(&x);
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; if (x == 42)
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; ++x;
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; return x; // check that x is not a constant here.
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; }
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; CHECK: ![[X:.*]] = !DILocalVariable(name: "x",
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; CHECK: bb.0.entry:
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; CHECK: DBG_VALUE 23, debug-use $noreg, ![[X]],
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; CHECK: DBG_VALUE $rsp, 0, ![[X]], !DIExpression(DW_OP_plus_uconst, 4, DW_OP_deref),
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; CHECK: bb.1.if.then:
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; CHECK: DBG_VALUE 43, debug-use $noreg, ![[X]],
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; CHECK: bb.2.if.end:
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; CHECK-NOT: DBG_VALUE 23, debug-use $noreg, ![[X]],
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; CHECK: RETQ $eax
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.11.0"
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; Function Attrs: nounwind ssp uwtable
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define i32 @f() #0 !dbg !4 {
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entry:
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%x = alloca i32, align 4
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%0 = bitcast i32* %x to i8*, !dbg !14
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call void @llvm.lifetime.start(i64 4, i8* %0) #4, !dbg !14
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tail call void @llvm.dbg.value(metadata i32 23, metadata !9, metadata !15), !dbg !16
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store i32 23, i32* %x, align 4, !dbg !16, !tbaa !17
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tail call void @llvm.dbg.value(metadata i32* %x, metadata !9, metadata !DIExpression(DW_OP_deref)), !dbg !16
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call void @g(i32* nonnull %x) #4, !dbg !21
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call void @llvm.dbg.value(metadata i32* %x, metadata !9, metadata !DIExpression(DW_OP_deref)), !dbg !16
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%1 = load i32, i32* %x, align 4, !dbg !22, !tbaa !17
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%cmp = icmp eq i32 %1, 42, !dbg !24
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br i1 %cmp, label %if.then, label %if.end, !dbg !25
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if.then: ; preds = %entry
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call void @llvm.dbg.value(metadata i32 43, metadata !9, metadata !15), !dbg !16
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store i32 43, i32* %x, align 4, !dbg !26, !tbaa !17
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br label %if.end, !dbg !26
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if.end: ; preds = %if.then, %entry
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%2 = phi i32 [ 43, %if.then ], [ %1, %entry ], !dbg !27
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call void @llvm.dbg.value(metadata i32* %x, metadata !9, metadata !DIExpression(DW_OP_deref)), !dbg !16
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call void @llvm.lifetime.end(i64 4, i8* %0) #4, !dbg !28
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ret i32 %2, !dbg !29
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.start(i64, i8* nocapture) #1
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declare void @g(i32*) #4
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.end(i64, i8* nocapture) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, metadata, metadata) #3
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attributes #0 = { nounwind ssp uwtable }
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attributes #1 = { argmemonly 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 = !{!10, !11, !12}
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!llvm.ident = !{!13}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 255890) (llvm/trunk 255919)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "constant.c", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 2, type: !5, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: true, unit: !0, retainedNodes: !8)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7}
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !{!9}
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!9 = !DILocalVariable(name: "x", scope: !4, file: !1, line: 3, type: !7)
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!10 = !{i32 2, !"Dwarf Version", i32 2}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{i32 1, !"PIC Level", i32 2}
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!13 = !{!"clang version 3.8.0 (trunk 255890) (llvm/trunk 255919)"}
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!14 = !DILocation(line: 3, column: 3, scope: !4)
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!15 = !DIExpression()
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!16 = !DILocation(line: 3, column: 7, scope: !4)
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!17 = !{!18, !18, i64 0}
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!18 = !{!"int", !19, i64 0}
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!19 = !{!"omnipotent char", !20, i64 0}
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!20 = !{!"Simple C/C++ TBAA"}
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!21 = !DILocation(line: 4, column: 3, scope: !4)
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!22 = !DILocation(line: 5, column: 7, scope: !23)
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!23 = distinct !DILexicalBlock(scope: !4, file: !1, line: 5, column: 7)
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!24 = !DILocation(line: 5, column: 9, scope: !23)
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!25 = !DILocation(line: 5, column: 7, scope: !4)
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!26 = !DILocation(line: 6, column: 5, scope: !23)
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!27 = !DILocation(line: 7, column: 10, scope: !4)
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!28 = !DILocation(line: 8, column: 1, scope: !4)
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!29 = !DILocation(line: 7, column: 3, scope: !4)
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