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
57 lines
2.6 KiB
LLVM
57 lines
2.6 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 dynamic allocas moved onto the unsafe stack.
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; In the dynamic alloca case, the dbg.value does not change with the exception
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; of the alloca pointer in the first argument being replaced with the new stack
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; top address.
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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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define void @f(i32 %n) safestack !dbg !6 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %n, metadata !11, metadata !14), !dbg !15
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%0 = zext i32 %n to i64, !dbg !16
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; CHECK: store i8* %[[VLA:.*]], i8** @__safestack_unsafe_stack_ptr
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; CHECK: tail call void @llvm.dbg.value(metadata i8* %[[VLA]], metadata ![[TYPE:.*]], metadata !DIExpression(DW_OP_deref))
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; CHECK: call void @capture({{.*}} %[[VLA]])
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%vla = alloca i8, i64 %0, align 16, !dbg !16
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tail call void @llvm.dbg.value(metadata i8* %vla, metadata !12, metadata !17), !dbg !18
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call void @capture(i8* nonnull %vla), !dbg !19
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ret void, !dbg !20
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}
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declare void @capture(i8*)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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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 272832) (llvm/trunk 272831)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "../llvm/1.cc", directory: "/code/build-llvm")
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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 272832) (llvm/trunk 272831)"}
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!6 = distinct !DISubprogram(name: "f", linkageName: "_Z1fi", scope: !1, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !10)
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!7 = !DISubroutineType(types: !8)
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!8 = !{null, !9}
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!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = !{!11, !12}
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!11 = !DILocalVariable(name: "n", arg: 1, scope: !6, file: !1, line: 2, type: !9)
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; CHECK-DAG: ![[TYPE]] = !DILocalVariable(name: "x",
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!12 = !DILocalVariable(name: "x", scope: !6, file: !1, line: 3, type: !13)
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!13 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!14 = !DIExpression()
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!15 = !DILocation(line: 2, column: 12, scope: !6)
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!16 = !DILocation(line: 3, column: 3, scope: !6)
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!17 = !DIExpression(DW_OP_deref)
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!18 = !DILocation(line: 3, column: 8, scope: !6)
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!19 = !DILocation(line: 4, column: 3, scope: !6)
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!20 = !DILocation(line: 5, column: 1, scope: !6)
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