6d353348e5
Summary: Most DIExpressions are empty or very simple. When they are complex, they tend to be unique, so checking them inline is reasonable. This also avoids the need for CodeGen passes to append to the llvm.dbg.mir named md node. See also PR22780, for making DIExpression not be an MDNode. Reviewers: aprantl, dexonsmith, dblaikie Subscribers: qcolombet, javed.absar, eraman, hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D37075 llvm-svn: 311594
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, variables: !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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