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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
84 lines
4.8 KiB
LLVM
84 lines
4.8 KiB
LLVM
; Checks that llvm.dbg.declare -> llvm.dbg.value conversion utility
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; (here exposed through the SROA) pass, properly inserts bit_piece expressions
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; if it only describes part of the variable.
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; RUN: opt -S -sroa %s | FileCheck %s
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; Built from:
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; struct foo { bool b; long i; };
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; void f(bool b, bool expr, foo g) {
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; }
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; And modifying the frag dbg.declare to use a fragmented DIExpression (with offset: 0, size: 4)
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; to test the dbg.declare+fragment case here.
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; Expect two fragments:
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; * first starting at bit 0, 8 bits (for the bool)
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; * second starting at bit 32, 32 bits (for the long)
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; (this happens to create/demonstrate a gap from bits [7, 32))
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; But also check that a complex expression is not used for a lone bool
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; parameter. It can reference the register it's in directly without masking off
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; high bits or anything
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; CHECK: call void @llvm.dbg.value(metadata i8 %g.coerce0, metadata ![[VAR_STRUCT:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 8))
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; CHECK: call void @llvm.dbg.value(metadata i64 %g.coerce1, metadata ![[VAR_STRUCT]], metadata !DIExpression(DW_OP_LLVM_fragment, 32, 64))
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; CHECK: call void @llvm.dbg.value(metadata i1 %b, metadata ![[VAR_BOOL:[0-9]+]], metadata !DIExpression())
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; CHECK: call void @llvm.dbg.value(metadata i1 %frag, metadata ![[VAR_FRAG:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 1))
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%struct.foo = type { i8, i64 }
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; Function Attrs: noinline nounwind uwtable
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define void @_Z1fbb3foo(i1 zeroext %b, i1 zeroext %frag, i8 %g.coerce0, i64 %g.coerce1) #0 !dbg !6 {
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entry:
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%g = alloca %struct.foo, align 8
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%b.addr = alloca i8, align 1
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%frag.addr = alloca i8, align 1
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%0 = bitcast %struct.foo* %g to { i8, i64 }*
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%1 = getelementptr inbounds { i8, i64 }, { i8, i64 }* %0, i32 0, i32 0
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store i8 %g.coerce0, i8* %1, align 8
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%2 = getelementptr inbounds { i8, i64 }, { i8, i64 }* %0, i32 0, i32 1
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store i64 %g.coerce1, i64* %2, align 8
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%frombool = zext i1 %b to i8
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store i8 %frombool, i8* %b.addr, align 1
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call void @llvm.dbg.declare(metadata i8* %b.addr, metadata !15, metadata !16), !dbg !17
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%frombool1 = zext i1 %frag to i8
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store i8 %frombool1, i8* %frag.addr, align 1
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call void @llvm.dbg.declare(metadata i8* %frag.addr, metadata !18, metadata !23), !dbg !19
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call void @llvm.dbg.declare(metadata %struct.foo* %g, metadata !20, metadata !16), !dbg !21
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ret void, !dbg !22
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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attributes #0 = { noinline nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 5.0.0 (trunk 303077) (llvm/trunk 303098)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "foo.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{!"clang version 5.0.0 (trunk 303077) (llvm/trunk 303098)"}
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!6 = distinct !DISubprogram(name: "f", linkageName: "_Z1fbb3foo", scope: !1, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!7 = !DISubroutineType(types: !8)
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!8 = !{null, !9, !9, !10}
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!9 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
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!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "foo", file: !1, line: 1, size: 128, elements: !11, identifier: "_ZTS3foo")
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!11 = !{!12, !13}
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!12 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !10, file: !1, line: 1, baseType: !9, size: 8)
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !10, file: !1, line: 1, baseType: !14, size: 64, offset: 64)
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!14 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
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!15 = !DILocalVariable(name: "b", arg: 1, scope: !6, file: !1, line: 2, type: !9)
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!16 = !DIExpression()
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!17 = !DILocation(line: 2, column: 13, scope: !6)
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!18 = !DILocalVariable(name: "frag", arg: 2, scope: !6, file: !1, line: 2, type: !9)
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!19 = !DILocation(line: 2, column: 21, scope: !6)
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!20 = !DILocalVariable(name: "g", arg: 3, scope: !6, file: !1, line: 2, type: !10)
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!21 = !DILocation(line: 2, column: 31, scope: !6)
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!22 = !DILocation(line: 3, column: 1, scope: !6)
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!23 = !DIExpression(DW_OP_LLVM_fragment, 0, 4)
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