1; Test dwarf codegen of DW_OP_minus.
2; RUN: llc -O0 -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s
3
4; This was built by compiling the following source with SafeStack and
5; simplifying the result a little.
6; extern "C" {
7; void Capture(int *);
8; void f() {
9;   int buf[100];
10;   Capture(buf);
11; }
12; }
13; The interesting part is !DIExpression(DW_OP_deref, DW_OP_minus, 400)
14
15target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
16target triple = "x86_64-unknown-linux-gnu"
17
18@__safestack_unsafe_stack_ptr = external thread_local(initialexec) global i8*
19
20define void @f() !dbg !4 {
21entry:
22  %unsafe_stack_ptr = load i8*, i8** @__safestack_unsafe_stack_ptr
23  %unsafe_stack_static_top = getelementptr i8, i8* %unsafe_stack_ptr, i32 -400
24  store i8* %unsafe_stack_static_top, i8** @__safestack_unsafe_stack_ptr
25  %0 = getelementptr i8, i8* %unsafe_stack_ptr, i32 -400
26  %buf = bitcast i8* %0 to [100 x i32]*
27  %1 = bitcast [100 x i32]* %buf to i8*, !dbg !16
28  call void @llvm.dbg.declare(metadata i8* %unsafe_stack_ptr, metadata !8, metadata !17), !dbg !18
29  %arraydecay = getelementptr inbounds [100 x i32], [100 x i32]* %buf, i64 0, i64 0, !dbg !19
30  call void @Capture(i32* %arraydecay), !dbg !20
31  store i8* %unsafe_stack_ptr, i8** @__safestack_unsafe_stack_ptr, !dbg !21
32  ret void, !dbg !21
33}
34
35; Function Attrs: nounwind readnone
36declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
37
38declare void @Capture(i32*)
39
40!llvm.dbg.cu = !{!0}
41!llvm.module.flags = !{!13, !14}
42
43!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 248518) (llvm/trunk 248512)", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, subprograms: !3)
44!1 = !DIFile(filename: "1.cc", directory: "/tmp")
45!2 = !{}
46!3 = !{!4}
47!4 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 4, type: !5, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, variables: !7)
48!5 = !DISubroutineType(types: !6)
49!6 = !{null}
50!7 = !{!8}
51!8 = !DILocalVariable(name: "buf", scope: !4, file: !1, line: 5, type: !9)
52!9 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, size: 3200, align: 32, elements: !11)
53!10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
54!11 = !{!12}
55!12 = !DISubrange(count: 100)
56!13 = !{i32 2, !"Dwarf Version", i32 4}
57!14 = !{i32 2, !"Debug Info Version", i32 3}
58!15 = !{!"clang version 3.8.0 (trunk 248518) (llvm/trunk 248512)"}
59!16 = !DILocation(line: 5, column: 3, scope: !4)
60!17 = !DIExpression(DW_OP_deref, DW_OP_minus, 400)
61!18 = !DILocation(line: 5, column: 7, scope: !4)
62!19 = !DILocation(line: 6, column: 11, scope: !4)
63!20 = !DILocation(line: 6, column: 3, scope: !4)
64!21 = !DILocation(line: 7, column: 1, scope: !4)
65
66; RCX - 400
67; CHECK:      .short	6                       # Loc expr size
68; CHECK-NEXT: .byte	114                     # DW_OP_breg2
69; CHECK-NEXT: .byte	0                       # 0
70; CHECK-NEXT: .byte	16                      # DW_OP_constu
71; CHECK-NEXT: .byte	144                     # 400
72; CHECK-NEXT: .byte	3                       # DW_OP_minus
73; CHECK-NEXT: .byte	28
74
75; RCX is clobbered in call @Capture, but there is a spilled copy.
76; *(RSP + 8) - 400
77; CHECK:      .short	7                       # Loc expr size
78; CHECK-NEXT: .byte	119                     # DW_OP_breg7
79; CHECK-NEXT: .byte	8                       # 8
80; CHECK-NEXT: .byte	6                       # DW_OP_deref
81; CHECK-NEXT: .byte	16                      # DW_OP_constu
82; CHECK-NEXT: .byte	144                     # 400
83; CHECK-NEXT: .byte	3                       # DW_OP_minus
84; CHECK-NEXT: .byte	28
85