1; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
2
3; Test llvm.dbg.value for dynamic allocas moved onto the unsafe stack.
4; In the dynamic alloca case, the dbg.value does not change with the exception
5; of the alloca pointer in the first argument being replaced with the new stack
6; top address.
7
8target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
9target triple = "x86_64-unknown-linux-gnu"
10
11define void @f(i32 %n) safestack !dbg !6 {
12entry:
13  tail call void @llvm.dbg.value(metadata i32 %n, metadata !11, metadata !14), !dbg !15
14  %0 = zext i32 %n to i64, !dbg !16
15
16; CHECK:  store i8* %[[VLA:.*]], i8** @__safestack_unsafe_stack_ptr
17; CHECK:  tail call void @llvm.dbg.value(metadata i8* %[[VLA]], metadata ![[TYPE:.*]], metadata !DIExpression(DW_OP_deref))
18; CHECK:  call void @capture({{.*}} %[[VLA]])
19
20  %vla = alloca i8, i64 %0, align 16, !dbg !16
21  tail call void @llvm.dbg.value(metadata i8* %vla, metadata !12, metadata !17), !dbg !18
22  call void @capture(i8* nonnull %vla), !dbg !19
23  ret void, !dbg !20
24}
25
26declare void @capture(i8*)
27declare void @llvm.dbg.value(metadata, metadata, metadata)
28
29!llvm.dbg.cu = !{!0}
30!llvm.module.flags = !{!3, !4}
31!llvm.ident = !{!5}
32
33!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)
34!1 = !DIFile(filename: "../llvm/1.cc", directory: "/code/build-llvm")
35!2 = !{}
36!3 = !{i32 2, !"Dwarf Version", i32 4}
37!4 = !{i32 2, !"Debug Info Version", i32 3}
38!5 = !{!"clang version 3.9.0 (trunk 272832) (llvm/trunk 272831)"}
39!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, retainedNodes: !10)
40!7 = !DISubroutineType(types: !8)
41!8 = !{null, !9}
42!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
43!10 = !{!11, !12}
44!11 = !DILocalVariable(name: "n", arg: 1, scope: !6, file: !1, line: 2, type: !9)
45
46; CHECK-DAG: ![[TYPE]] = !DILocalVariable(name: "x",
47!12 = !DILocalVariable(name: "x", scope: !6, file: !1, line: 3, type: !13)
48!13 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
49!14 = !DIExpression()
50!15 = !DILocation(line: 2, column: 12, scope: !6)
51!16 = !DILocation(line: 3, column: 3, scope: !6)
52
53!17 = !DIExpression(DW_OP_deref)
54!18 = !DILocation(line: 3, column: 8, scope: !6)
55!19 = !DILocation(line: 4, column: 3, scope: !6)
56!20 = !DILocation(line: 5, column: 1, scope: !6)
57