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
97 lines
4.8 KiB
LLVM
97 lines
4.8 KiB
LLVM
; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
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; Test llvm.dbg.value for the local variables moved onto the unsafe stack.
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; SafeStack rewrites them relative to the unsafe stack pointer (base address of
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; the unsafe stack frame).
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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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; Function Attrs: noinline safestack uwtable
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define void @f() #0 !dbg !6 {
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entry:
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; CHECK: %[[USP:.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr
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%x1 = alloca i32, align 4
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%x2 = alloca i32, align 4
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%0 = bitcast i32* %x1 to i8*, !dbg !13
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%1 = bitcast i32* %x2 to i8*, !dbg !14
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; Unhandled dbg.value: expression does not start with OP_DW_deref
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; CHECK: call void @llvm.dbg.value(metadata ![[EMPTY:.*]], metadata !{{.*}}, metadata !{{.*}})
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tail call void @llvm.dbg.value(metadata i32* %x1, metadata !10, metadata !23), !dbg !16
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; Unhandled dbg.value: expression does not start with OP_DW_deref
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; CHECK: call void @llvm.dbg.value(metadata ![[EMPTY]], metadata !{{.*}}, metadata !{{.*}})
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tail call void @llvm.dbg.value(metadata i32* %x1, metadata !10, metadata !24), !dbg !16
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; Supported dbg.value: rewritted based on the [[USP]] value.
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; CHECK: call void @llvm.dbg.value(metadata i8* %[[USP]], metadata ![[X1:.*]], metadata !DIExpression(DW_OP_deref, DW_OP_constu, 4, DW_OP_minus))
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tail call void @llvm.dbg.value(metadata i32* %x1, metadata !10, metadata !15), !dbg !16
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call void @capture(i32* nonnull %x1), !dbg !17
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; An extra non-dbg.value metadata use of %x2. Replaced with an empty metadata.
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; CHECK: call void @llvm.random.metadata.use(metadata ![[EMPTY]])
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call void @llvm.random.metadata.use(metadata i32* %x2)
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; CHECK: call void @llvm.dbg.value(metadata i8* %[[USP]], metadata ![[X2:.*]], metadata !DIExpression(DW_OP_deref, DW_OP_constu, 8, DW_OP_minus))
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call void @llvm.dbg.value(metadata i32* %x2, metadata !12, metadata !15), !dbg !18
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call void @capture(i32* nonnull %x2), !dbg !19
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ret void, !dbg !20
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
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declare void @capture(i32*) #2
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.end.p0i8(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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declare void @llvm.random.metadata.use(metadata)
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attributes #0 = { noinline safestack uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-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 = { argmemonly nounwind }
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attributes #2 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-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 #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 = !{!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 3.9.0 (trunk 271022) (llvm/trunk 271027)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "../llvm/2.cc", directory: "/code/build-llvm")
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; CHECK-DAG: ![[EMPTY]] = !{}
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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 3.9.0 (trunk 271022) (llvm/trunk 271027)"}
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!6 = distinct !DISubprogram(name: "f", linkageName: "_Z1fv", scope: !1, file: !1, line: 4, type: !7, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !9)
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!7 = !DISubroutineType(types: !8)
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!8 = !{null}
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!9 = !{!10, !12}
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; CHECK-DAG: ![[X1]] = !DILocalVariable(name: "x1",
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!10 = !DILocalVariable(name: "x1", scope: !6, file: !1, line: 5, type: !11)
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!11 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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; CHECK-DAG: ![[X2]] = !DILocalVariable(name: "x2",
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!12 = !DILocalVariable(name: "x2", scope: !6, file: !1, line: 6, type: !11)
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!13 = !DILocation(line: 5, column: 3, scope: !6)
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!14 = !DILocation(line: 6, column: 3, scope: !6)
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!15 = !DIExpression(DW_OP_deref)
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!16 = !DILocation(line: 5, column: 7, scope: !6)
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!17 = !DILocation(line: 8, column: 3, scope: !6)
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!18 = !DILocation(line: 6, column: 7, scope: !6)
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!19 = !DILocation(line: 9, column: 3, scope: !6)
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!20 = !DILocation(line: 10, column: 1, scope: !6)
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!21 = !DILocation(line: 10, column: 1, scope: !22)
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!22 = !DILexicalBlockFile(scope: !6, file: !1, discriminator: 1)
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!23 = !DIExpression()
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!24 = !DIExpression(DW_OP_constu, 42, DW_OP_minus)
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