1; RUN: llc -O0 -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s
2
3; Verify that we have correct debug info for local variables in code
4; instrumented with AddressSanitizer.
5
6; Generated from the source file test.cc:
7; int bar(int y) {
8;   return y + 2;
9; }
10; with "clang++ -S -emit-llvm -mllvm -asan-skip-promotable-allocas=0 -fsanitize=address -O0 -g test.cc"
11
12; The address of the (potentially now malloc'ed) alloca ends up
13; in RDI, after which it is spilled to the stack. We record the
14; spill OFFSET on the stack for checking the debug info below.
15; CHECK: #DEBUG_VALUE: bar:y <- [%RDI+0]
16; CHECK: movq %rdi, [[OFFSET:[0-9]+]](%rsp)
17; CHECK-NEXT: [[START_LABEL:.Ltmp[0-9]+]]
18; This location should be valid until the end of the function.
19
20; CHECK: .Ldebug_loc{{[0-9]+}}:
21; We expect two location ranges for the variable.
22
23; First, its address is stored in %rdi:
24; CHECK:      .quad .Lfunc_begin0-.Lfunc_begin0
25; CHECK-NEXT: .quad [[START_LABEL]]-.Lfunc_begin0
26; CHECK: DW_OP_breg5
27
28; Then it's addressed via %rsp:
29; CHECK:      .quad [[START_LABEL]]-.Lfunc_begin0
30; CHECK-NEXT: .Lfunc_end0-.Lfunc_begin0
31; CHECK: DW_OP_breg7
32; CHECK-NEXT: [[OFFSET]]
33; CHECK: DW_OP_deref
34
35; ModuleID = 'test.cc'
36target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
37target triple = "x86_64-unknown-linux-gnu"
38
39@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 1, void ()* @asan.module_ctor }]
40@__asan_option_detect_stack_use_after_return = external global i32
41@__asan_gen_ = private unnamed_addr constant [16 x i8] c"1 32 4 6 y.addr\00", align 1
42
43; Function Attrs: nounwind sanitize_address uwtable
44define i32 @_Z3bari(i32 %y) #0 !dbg !4 {
45entry:
46  %MyAlloca = alloca [64 x i8], align 32
47  %0 = ptrtoint [64 x i8]* %MyAlloca to i64
48  %1 = load i32, i32* @__asan_option_detect_stack_use_after_return
49  %2 = icmp ne i32 %1, 0
50  br i1 %2, label %3, label %5
51
52; <label>:3                                       ; preds = %entry
53  %4 = call i64 @__asan_stack_malloc_0(i64 64, i64 %0)
54  br label %5
55
56; <label>:5                                       ; preds = %entry, %3
57  %6 = phi i64 [ %0, %entry ], [ %4, %3 ]
58  %7 = add i64 %6, 32
59  %8 = inttoptr i64 %7 to i32*
60  %9 = inttoptr i64 %6 to i64*
61  store i64 1102416563, i64* %9
62  %10 = add i64 %6, 8
63  %11 = inttoptr i64 %10 to i64*
64  store i64 ptrtoint ([16 x i8]* @__asan_gen_ to i64), i64* %11
65  %12 = add i64 %6, 16
66  %13 = inttoptr i64 %12 to i64*
67  store i64 ptrtoint (i32 (i32)* @_Z3bari to i64), i64* %13
68  %14 = lshr i64 %6, 3
69  %15 = add i64 %14, 2147450880
70  %16 = add i64 %15, 0
71  %17 = inttoptr i64 %16 to i64*
72  store i64 -868083100587789839, i64* %17
73  %18 = ptrtoint i32* %8 to i64
74  %19 = lshr i64 %18, 3
75  %20 = add i64 %19, 2147450880
76  %21 = inttoptr i64 %20 to i8*
77  %22 = load i8, i8* %21
78  %23 = icmp ne i8 %22, 0
79  call void @llvm.dbg.declare(metadata i32* %8, metadata !12, metadata !14), !dbg !DILocation(scope: !4)
80  br i1 %23, label %24, label %30
81
82; <label>:24                                      ; preds = %5
83  %25 = and i64 %18, 7
84  %26 = add i64 %25, 3
85  %27 = trunc i64 %26 to i8
86  %28 = icmp sge i8 %27, %22
87  br i1 %28, label %29, label %30
88
89; <label>:29                                      ; preds = %24
90  call void @__asan_report_store4(i64 %18)
91  call void asm sideeffect "", ""()
92  unreachable
93
94; <label>:30                                      ; preds = %24, %5
95  store i32 %y, i32* %8, align 4
96  %31 = ptrtoint i32* %8 to i64, !dbg !13
97  %32 = lshr i64 %31, 3, !dbg !13
98  %33 = add i64 %32, 2147450880, !dbg !13
99  %34 = inttoptr i64 %33 to i8*, !dbg !13
100  %35 = load i8, i8* %34, !dbg !13
101  %36 = icmp ne i8 %35, 0, !dbg !13
102  br i1 %36, label %37, label %43, !dbg !13
103
104; <label>:37                                      ; preds = %30
105  %38 = and i64 %31, 7, !dbg !13
106  %39 = add i64 %38, 3, !dbg !13
107  %40 = trunc i64 %39 to i8, !dbg !13
108  %41 = icmp sge i8 %40, %35, !dbg !13
109  br i1 %41, label %42, label %43
110
111; <label>:42                                      ; preds = %37
112  call void @__asan_report_load4(i64 %31), !dbg !13
113  call void asm sideeffect "", ""()
114  unreachable
115
116; <label>:43                                      ; preds = %37, %30
117  %44 = load i32, i32* %8, align 4, !dbg !13
118  %add = add nsw i32 %44, 2, !dbg !13
119  store i64 1172321806, i64* %9, !dbg !13
120  %45 = icmp ne i64 %6, %0, !dbg !13
121  br i1 %45, label %46, label %53, !dbg !13
122
123; <label>:46                                      ; preds = %43
124  %47 = add i64 %15, 0, !dbg !13
125  %48 = inttoptr i64 %47 to i64*, !dbg !13
126  store i64 -723401728380766731, i64* %48, !dbg !13
127  %49 = add i64 %6, 56, !dbg !13
128  %50 = inttoptr i64 %49 to i64*, !dbg !13
129  %51 = load i64, i64* %50, !dbg !13
130  %52 = inttoptr i64 %51 to i8*, !dbg !13
131  store i8 0, i8* %52, !dbg !13
132  br label %56, !dbg !13
133
134; <label>:53                                      ; preds = %43
135  %54 = add i64 %15, 0, !dbg !13
136  %55 = inttoptr i64 %54 to i64*, !dbg !13
137  store i64 0, i64* %55, !dbg !13
138  br label %56, !dbg !13
139
140; <label>:56                                      ; preds = %53, %46
141  ret i32 %add, !dbg !13
142}
143
144; Function Attrs: nounwind readnone
145declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
146
147define internal void @asan.module_ctor() {
148  call void @__asan_init_v3()
149  ret void
150}
151
152declare void @__asan_init_v3()
153
154declare void @__asan_report_load4(i64)
155
156declare void @__asan_report_store4(i64)
157
158declare i64 @__asan_stack_malloc_0(i64, i64)
159
160attributes #0 = { nounwind sanitize_address uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
161attributes #1 = { nounwind readnone }
162
163!llvm.dbg.cu = !{!0}
164!llvm.module.flags = !{!9, !10}
165!llvm.ident = !{!11}
166
167!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 (209308)", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
168!1 = !DIFile(filename: "test.cc", directory: "/llvm_cmake_gcc")
169!2 = !{}
170!3 = !{!4}
171!4 = distinct !DISubprogram(name: "bar", linkageName: "_Z3bari", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
172!5 = !DIFile(filename: "test.cc", directory: "/llvm_cmake_gcc")
173!6 = !DISubroutineType(types: !7)
174!7 = !{!8, !8}
175!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
176!9 = !{i32 2, !"Dwarf Version", i32 4}
177!10 = !{i32 2, !"Debug Info Version", i32 3}
178!11 = !{!"clang version 3.5.0 (209308)"}
179!12 = !DILocalVariable(name: "y", line: 1, arg: 1, scope: !4, file: !5, type: !8)
180!13 = !DILocation(line: 2, scope: !4)
181!14 = !DIExpression(DW_OP_deref)
182