1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
; RUN: llc -mtriple=x86_64-pc-linux-gnu -start-before=stack-protector \
; RUN: -stop-after=stack-protector -o - < %s | FileCheck %s
; Bugs 42238/43308: Test some additional situations not caught previously.
define void @store_captures() #0 {
; CHECK-LABEL: @store_captures(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[STACKGUARDSLOT:%.*]] = alloca ptr
; CHECK-NEXT: [[STACKGUARD:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
; CHECK-NEXT: call void @llvm.stackprotector(ptr [[STACKGUARD]], ptr [[STACKGUARDSLOT]])
; CHECK-NEXT: [[RETVAL:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[J:%.*]] = alloca ptr, align 8
; CHECK-NEXT: store i32 0, ptr [[RETVAL]]
; CHECK-NEXT: [[LOAD:%.*]] = load i32, ptr [[A]], align 4
; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[LOAD]], 1
; CHECK-NEXT: store i32 [[ADD]], ptr [[A]], align 4
; CHECK-NEXT: store ptr [[A]], ptr [[J]], align 8
; CHECK-NEXT: [[STACKGUARD1:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
; CHECK-NEXT: [[TMP0:%.*]] = load volatile ptr, ptr [[STACKGUARDSLOT]]
; CHECK-NEXT: [[TMP1:%.*]] = icmp eq ptr [[STACKGUARD1]], [[TMP0]]
; CHECK-NEXT: br i1 [[TMP1]], label [[SP_RETURN:%.*]], label [[CALLSTACKCHECKFAILBLK:%.*]], !prof !0
; CHECK: SP_return:
; CHECK-NEXT: ret void
; CHECK: CallStackCheckFailBlk:
; CHECK-NEXT: call void @__stack_chk_fail()
; CHECK-NEXT: unreachable
;
entry:
%retval = alloca i32, align 4
%a = alloca i32, align 4
%j = alloca ptr, align 8
store i32 0, ptr %retval
%load = load i32, ptr %a, align 4
%add = add nsw i32 %load, 1
store i32 %add, ptr %a, align 4
store ptr %a, ptr %j, align 8
ret void
}
define ptr @non_captures() #0 {
; load, atomicrmw, and ret do not trigger a stack protector.
; CHECK-LABEL: @non_captures(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[LOAD:%.*]] = load i32, ptr [[A]], align 4
; CHECK-NEXT: [[ATOM:%.*]] = atomicrmw add ptr [[A]], i32 1 seq_cst
; CHECK-NEXT: ret ptr [[A]]
;
entry:
%a = alloca i32, align 4
%load = load i32, ptr %a, align 4
%atom = atomicrmw add ptr %a, i32 1 seq_cst
ret ptr %a
}
define void @store_addrspacecast_captures() #0 {
; CHECK-LABEL: @store_addrspacecast_captures(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[STACKGUARDSLOT:%.*]] = alloca ptr
; CHECK-NEXT: [[STACKGUARD:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
; CHECK-NEXT: call void @llvm.stackprotector(ptr [[STACKGUARD]], ptr [[STACKGUARDSLOT]])
; CHECK-NEXT: [[RETVAL:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[J:%.*]] = alloca ptr addrspace(1), align 8
; CHECK-NEXT: store i32 0, ptr [[RETVAL]]
; CHECK-NEXT: [[LOAD:%.*]] = load i32, ptr [[A]], align 4
; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[LOAD]], 1
; CHECK-NEXT: store i32 [[ADD]], ptr [[A]], align 4
; CHECK-NEXT: [[A_ADDRSPACECAST:%.*]] = addrspacecast ptr [[A]] to ptr addrspace(1)
; CHECK-NEXT: store ptr addrspace(1) [[A_ADDRSPACECAST]], ptr [[J]], align 8
; CHECK-NEXT: [[STACKGUARD1:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
; CHECK-NEXT: [[TMP0:%.*]] = load volatile ptr, ptr [[STACKGUARDSLOT]]
; CHECK-NEXT: [[TMP1:%.*]] = icmp eq ptr [[STACKGUARD1]], [[TMP0]]
; CHECK-NEXT: br i1 [[TMP1]], label [[SP_RETURN:%.*]], label [[CALLSTACKCHECKFAILBLK:%.*]], !prof !0
; CHECK: SP_return:
; CHECK-NEXT: ret void
; CHECK: CallStackCheckFailBlk:
; CHECK-NEXT: call void @__stack_chk_fail()
; CHECK-NEXT: unreachable
;
entry:
%retval = alloca i32, align 4
%a = alloca i32, align 4
%j = alloca ptr addrspace(1), align 8
store i32 0, ptr %retval
%load = load i32, ptr %a, align 4
%add = add nsw i32 %load, 1
store i32 %add, ptr %a, align 4
%a.addrspacecast = addrspacecast ptr %a to ptr addrspace(1)
store ptr addrspace(1) %a.addrspacecast, ptr %j, align 8
ret void
}
define void @cmpxchg_captures() #0 {
; CHECK-LABEL: @cmpxchg_captures(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[STACKGUARDSLOT:%.*]] = alloca ptr
; CHECK-NEXT: [[STACKGUARD:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
; CHECK-NEXT: call void @llvm.stackprotector(ptr [[STACKGUARD]], ptr [[STACKGUARDSLOT]])
; CHECK-NEXT: [[RETVAL:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[J:%.*]] = alloca ptr, align 8
; CHECK-NEXT: store i32 0, ptr [[RETVAL]]
; CHECK-NEXT: [[LOAD:%.*]] = load i32, ptr [[A]], align 4
; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[LOAD]], 1
; CHECK-NEXT: store i32 [[ADD]], ptr [[A]], align 4
; CHECK-NEXT: [[TMP0:%.*]] = cmpxchg ptr [[J]], ptr null, ptr [[A]] seq_cst monotonic
; CHECK-NEXT: [[STACKGUARD1:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
; CHECK-NEXT: [[TMP1:%.*]] = load volatile ptr, ptr [[STACKGUARDSLOT]]
; CHECK-NEXT: [[TMP2:%.*]] = icmp eq ptr [[STACKGUARD1]], [[TMP1]]
; CHECK-NEXT: br i1 [[TMP2]], label [[SP_RETURN:%.*]], label [[CALLSTACKCHECKFAILBLK:%.*]], !prof !0
; CHECK: SP_return:
; CHECK-NEXT: ret void
; CHECK: CallStackCheckFailBlk:
; CHECK-NEXT: call void @__stack_chk_fail()
; CHECK-NEXT: unreachable
;
entry:
%retval = alloca i32, align 4
%a = alloca i32, align 4
%j = alloca ptr, align 8
store i32 0, ptr %retval
%load = load i32, ptr %a, align 4
%add = add nsw i32 %load, 1
store i32 %add, ptr %a, align 4
cmpxchg ptr %j, ptr null, ptr %a seq_cst monotonic
ret void
}
define void @memset_captures(i64 %c) #0 {
; CHECK-LABEL: @memset_captures(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[STACKGUARDSLOT:%.*]] = alloca ptr
; CHECK-NEXT: [[STACKGUARD:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
; CHECK-NEXT: call void @llvm.stackprotector(ptr [[STACKGUARD]], ptr [[STACKGUARDSLOT]])
; CHECK-NEXT: [[CADDR:%.*]] = alloca i64, align 8
; CHECK-NEXT: store i64 %c, ptr [[CADDR]], align 8
; CHECK-NEXT: [[I:%.*]] = alloca i32, align 4
; CHECK-NEXT: [[COUNT:%.*]] = load i64, ptr [[CADDR]], align 8
; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 4 [[I]], i8 0, i64 [[COUNT]], i1 false)
; CHECK-NEXT: [[STACKGUARD1:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
; CHECK-NEXT: [[TMP1:%.*]] = load volatile ptr, ptr [[STACKGUARDSLOT]]
; CHECK-NEXT: [[TMP2:%.*]] = icmp eq ptr [[STACKGUARD1]], [[TMP1]]
; CHECK-NEXT: br i1 [[TMP2]], label [[SP_RETURN:%.*]], label [[CALLSTACKCHECKFAILBLK:%.*]], !prof !0
; CHECK: SP_return:
; CHECK-NEXT: ret void
; CHECK: CallStackCheckFailBlk:
; CHECK-NEXT: call void @__stack_chk_fail()
; CHECK-NEXT: unreachable
;
entry:
%c.addr = alloca i64, align 8
store i64 %c, ptr %c.addr, align 8
%i = alloca i32, align 4
%count = load i64, ptr %c.addr, align 8
call void @llvm.memset.p0.i64(ptr align 4 %i, i8 0, i64 %count, i1 false)
ret void
}
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg)
; Intentionally does not have any fn attrs.
declare dso_local void @foo(ptr)
; @bar_sspstrong and @bar_nossp are the same function, but differ only in
; function attributes. Test that a callee without stack protector function
; attribute does not trigger a stack guard slot in a caller that also does not
; have a stack protector slot.
define dso_local void @bar_sspstrong(i64 %0) #0 {
; CHECK-LABEL: @bar_sspstrong
; CHECK-NEXT: %StackGuardSlot = alloca ptr
%2 = alloca i64, align 8
store i64 %0, ptr %2, align 8
%3 = load i64, ptr %2, align 8
%4 = alloca i8, i64 %3, align 16
call void @foo(ptr %4)
ret void
}
; Intentionally does not have any fn attrs.
define dso_local void @bar_nossp(i64 %0) {
; CHECK-LABEL: @bar_nossp
; CHECK-NEXT: %2 = alloca i64
%2 = alloca i64, align 8
store i64 %0, ptr %2, align 8
%3 = load i64, ptr %2, align 8
%4 = alloca i8, i64 %3, align 16
call void @foo(ptr %4)
ret void
}
; Check stack protect for noreturn call
define dso_local i32 @foo_no_return(i32 %0) #1 {
; CHECK-LABEL: @foo_no_return
entry:
%cmp = icmp sgt i32 %0, 4
br i1 %cmp, label %if.then, label %if.end
; CHECK: if.then: ; preds = %entry
; CHECK-NEXT: %StackGuard1 = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257)), align 8
; CHECK-NEXT: %1 = load volatile ptr, ptr %StackGuardSlot, align 8
; CHECK-NEXT: %2 = icmp eq ptr %StackGuard1, %1
; CHECK-NEXT: br i1 %2, label %SP_return, label %CallStackCheckFailBlk
; CHECK: SP_return: ; preds = %if.then
; CHECK-NEXT: %call = call i32 @foo_no_return(i32 1)
; CHECK-NEXT: br label %return
; CHECK: if.end: ; preds = %entry
; CHECK-NEXT: br label %return
if.then: ; preds = %entry
%call = call i32 @foo_no_return(i32 1)
br label %return
if.end: ; preds = %entry
br label %return
return: ; preds = %if.end, %if.then
ret i32 0
}
declare void @callee() noreturn nounwind
define void @caller() sspstrong {
; Test that a stack protector is NOT inserted when we call nounwind functions.
; CHECK-LABEL: @caller
; CHECK-NEXT: call void @callee
call void @callee() noreturn nounwind
ret void
}
attributes #0 = { sspstrong }
attributes #1 = { noreturn sspreq}
|
