1; clang -target aarch64-eabi -O2 -march=armv8.5-a+memtag -fsanitize=memtag -S -emit-llvm test.cc
2; void bar() {
3;   throw 42;
4; }
5
6; void foo() {
7;   int A0;
8;   __asm volatile("" : : "r"(&A0));
9
10;   try {
11;     bar();
12;   } catch (int exc) {
13;   }
14
15;   throw 15532;
16; }
17
18; int main() {
19;   try {
20;     foo();
21;   } catch (int exc) {
22;   }
23
24;   return 0;
25; }
26
27; RUN: opt -S -aarch64-stack-tagging %s -o - | FileCheck %s
28
29target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
30target triple = "aarch64-unknown-unknown-eabi"
31
32@_ZTIi = external dso_local constant i8*
33
34; Function Attrs: noreturn sanitize_memtag
35define dso_local void @_Z3barv() local_unnamed_addr #0 {
36entry:
37  %exception = tail call i8* @__cxa_allocate_exception(i64 4) #4
38  %0 = bitcast i8* %exception to i32*
39  store i32 42, i32* %0, align 16, !tbaa !2
40  tail call void @__cxa_throw(i8* %exception, i8* bitcast (i8** @_ZTIi to i8*), i8* null) #5
41  unreachable
42}
43
44declare dso_local i8* @__cxa_allocate_exception(i64) local_unnamed_addr
45
46declare dso_local void @__cxa_throw(i8*, i8*, i8*) local_unnamed_addr
47
48; Function Attrs: noreturn sanitize_memtag
49define dso_local void @_Z3foov() local_unnamed_addr #0 personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
50entry:
51  %A0 = alloca i32, align 4
52  %0 = bitcast i32* %A0 to i8*
53  call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %0) #4
54  call void asm sideeffect "", "r"(i32* nonnull %A0) #4, !srcloc !6
55  invoke void @_Z3barv()
56          to label %try.cont unwind label %lpad
57
58lpad:                                             ; preds = %entry
59  %1 = landingpad { i8*, i32 }
60          cleanup
61          catch i8* bitcast (i8** @_ZTIi to i8*)
62  %2 = extractvalue { i8*, i32 } %1, 1
63  %3 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*)) #4
64  %matches = icmp eq i32 %2, %3
65  br i1 %matches, label %catch, label %ehcleanup
66
67catch:                                            ; preds = %lpad
68  %4 = extractvalue { i8*, i32 } %1, 0
69  %5 = call i8* @__cxa_begin_catch(i8* %4) #4
70  call void @__cxa_end_catch() #4
71  br label %try.cont
72
73try.cont:                                         ; preds = %entry, %catch
74  %exception = call i8* @__cxa_allocate_exception(i64 4) #4
75  %6 = bitcast i8* %exception to i32*
76  store i32 15532, i32* %6, align 16, !tbaa !2
77  call void @__cxa_throw(i8* %exception, i8* bitcast (i8** @_ZTIi to i8*), i8* null) #5
78  unreachable
79
80ehcleanup:                                        ; preds = %lpad
81  call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %0) #4
82  resume { i8*, i32 } %1
83}
84
85; Function Attrs: argmemonly nounwind willreturn
86declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1
87
88declare dso_local i32 @__gxx_personality_v0(...)
89
90; Function Attrs: nounwind readnone
91declare i32 @llvm.eh.typeid.for(i8*) #2
92
93declare dso_local i8* @__cxa_begin_catch(i8*) local_unnamed_addr
94
95declare dso_local void @__cxa_end_catch() local_unnamed_addr
96
97; Function Attrs: argmemonly nounwind willreturn
98declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
99
100; Function Attrs: norecurse sanitize_memtag
101define dso_local i32 @main() local_unnamed_addr #3 personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
102entry:
103; CHECK-LABEL: entry:
104  %A0.i = alloca i32, align 4
105  %0 = bitcast i32* %A0.i to i8*
106  call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %0) #4
107  call void asm sideeffect "", "r"(i32* nonnull %A0.i) #4, !srcloc !6
108; CHECK: call void @llvm.aarch64.settag(i8* %1, i64 16)
109; CHECK-NEXT: call void asm sideeffect
110  %exception.i6 = call i8* @__cxa_allocate_exception(i64 4) #4
111  %1 = bitcast i8* %exception.i6 to i32*
112  store i32 42, i32* %1, align 16, !tbaa !2
113  invoke void @__cxa_throw(i8* %exception.i6, i8* bitcast (i8** @_ZTIi to i8*), i8* null) #5
114          to label %.noexc7 unwind label %lpad.i
115
116.noexc7:                                          ; preds = %entry
117  unreachable
118
119lpad.i:                                           ; preds = %entry
120  %2 = landingpad { i8*, i32 }
121          cleanup
122          catch i8* bitcast (i8** @_ZTIi to i8*)
123  %3 = extractvalue { i8*, i32 } %2, 1
124  %4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*)) #4
125  %matches.i = icmp eq i32 %3, %4
126  br i1 %matches.i, label %catch.i, label %ehcleanup.i
127
128catch.i:                                          ; preds = %lpad.i
129  %5 = extractvalue { i8*, i32 } %2, 0
130  %6 = call i8* @__cxa_begin_catch(i8* %5) #4
131  call void @__cxa_end_catch() #4
132  %exception.i = call i8* @__cxa_allocate_exception(i64 4) #4
133  %7 = bitcast i8* %exception.i to i32*
134  store i32 15532, i32* %7, align 16, !tbaa !2
135  invoke void @__cxa_throw(i8* %exception.i, i8* bitcast (i8** @_ZTIi to i8*), i8* null) #5
136          to label %.noexc unwind label %lpad
137
138.noexc:                                           ; preds = %catch.i
139  unreachable
140
141ehcleanup.i:                                      ; preds = %lpad.i
142  call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %0) #4
143  br label %lpad.body
144
145lpad:                                             ; preds = %catch.i
146  %8 = landingpad { i8*, i32 }
147          catch i8* bitcast (i8** @_ZTIi to i8*)
148  %.pre = extractvalue { i8*, i32 } %8, 1
149  br label %lpad.body
150
151lpad.body:                                        ; preds = %ehcleanup.i, %lpad
152  %.pre-phi = phi i32 [ %3, %ehcleanup.i ], [ %.pre, %lpad ]
153  %eh.lpad-body = phi { i8*, i32 } [ %2, %ehcleanup.i ], [ %8, %lpad ]
154  %matches = icmp eq i32 %.pre-phi, %4
155  br i1 %matches, label %catch, label %eh.resume
156
157catch:                                            ; preds = %lpad.body
158  %9 = extractvalue { i8*, i32 } %eh.lpad-body, 0
159  %10 = call i8* @__cxa_begin_catch(i8* %9) #4
160  call void @__cxa_end_catch() #4
161  ret i32 0
162
163eh.resume:                                        ; preds = %lpad.body
164  resume { i8*, i32 } %eh.lpad-body
165}
166
167attributes #0 = { noreturn sanitize_memtag "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "target-features"="+mte,+neon,+v8.5a" "unsafe-fp-math"="false" "use-soft-float"="false" }
168attributes #1 = { argmemonly nounwind willreturn }
169attributes #2 = { nounwind readnone }
170attributes #3 = { norecurse sanitize_memtag "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "target-features"="+mte,+neon,+v8.5a" "unsafe-fp-math"="false" "use-soft-float"="false" }
171attributes #4 = { nounwind }
172attributes #5 = { noreturn }
173
174!llvm.module.flags = !{!0}
175!llvm.ident = !{!1}
176
177!0 = !{i32 1, !"wchar_size", i32 4}
178!1 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git c38188c5fe41751fda095edde1a878b2a051ae58)"}
179!2 = !{!3, !3, i64 0}
180!3 = !{!"int", !4, i64 0}
181!4 = !{!"omnipotent char", !5, i64 0}
182!5 = !{!"Simple C++ TBAA"}
183!6 = !{i32 70}
184