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
|
// RUN: mlir-opt %s --transform-dialect-check-uses --split-input-file --verify-diagnostics
func.func @use_after_free_branching_control_flow() {
// expected-note @below {{allocated here}}
%0 = transform.test_produce_self_handle_or_forward_operand : () -> !transform.any_op
transform.test_transform_op_with_regions {
"transform.test_branching_transform_op_terminator"() : () -> ()
},
{
^bb0:
"transform.test_branching_transform_op_terminator"()[^bb1, ^bb2] : () -> ()
^bb1:
// expected-note @below {{freed here}}
transform.test_consume_operand_of_op_kind_or_fail %0, "transform.test_produce_self_handle_or_forward_operand" : !transform.any_op
"transform.test_branching_transform_op_terminator"()[^bb3] : () -> ()
^bb2:
"transform.test_branching_transform_op_terminator"()[^bb3] : () -> ()
^bb3:
// expected-warning @below {{operand #0 may be used after free}}
transform.sequence %0 : !transform.any_op failures(propagate) {
^bb0(%arg0: !transform.any_op):
}
"transform.test_branching_transform_op_terminator"() : () -> ()
}
return
}
// -----
func.func @use_after_free_in_nested_op() {
// expected-note @below {{allocated here}}
%0 = transform.test_produce_self_handle_or_forward_operand : () -> !transform.any_op
// expected-note @below {{freed here}}
transform.test_transform_op_with_regions {
"transform.test_branching_transform_op_terminator"() : () -> ()
},
{
^bb0:
"transform.test_branching_transform_op_terminator"()[^bb1, ^bb2] : () -> ()
^bb1:
transform.test_consume_operand_of_op_kind_or_fail %0, "transform.test_produce_self_handle_or_forward_operand" : !transform.any_op
"transform.test_branching_transform_op_terminator"()[^bb3] : () -> ()
^bb2:
"transform.test_branching_transform_op_terminator"()[^bb3] : () -> ()
^bb3:
"transform.test_branching_transform_op_terminator"() : () -> ()
}
// expected-warning @below {{operand #0 may be used after free}}
transform.sequence %0 : !transform.any_op failures(propagate) {
^bb0(%arg0: !transform.any_op):
}
return
}
// -----
func.func @use_after_free_recursive_side_effects() {
transform.sequence failures(propagate) {
^bb0(%arg0: !transform.any_op):
// expected-note @below {{allocated here}}
%0 = transform.sequence %arg0 : !transform.any_op -> !transform.any_op failures(propagate) attributes { ord = 1 } {
^bb1(%arg1: !transform.any_op):
yield %arg1 : !transform.any_op
}
transform.sequence %0 : !transform.any_op failures(propagate) attributes { ord = 2 } {
^bb2(%arg2: !transform.any_op):
}
transform.sequence %0 : !transform.any_op failures(propagate) attributes { ord = 3 } {
^bb3(%arg3: !transform.any_op):
}
// `transform.sequence` has recursive side effects so it has the same "free"
// as the child op it contains.
// expected-note @below {{freed here}}
transform.sequence %0 : !transform.any_op failures(propagate) attributes { ord = 4 } {
^bb4(%arg4: !transform.any_op):
test_consume_operand_of_op_kind_or_fail %0, "transform.sequence" : !transform.any_op
}
// expected-warning @below {{operand #0 may be used after free}}
transform.sequence %0 : !transform.any_op failures(propagate) attributes { ord = 5 } {
^bb3(%arg3: !transform.any_op):
}
}
return
}
// -----
func.func @use_after_free() {
transform.sequence failures(propagate) {
^bb0(%arg0: !transform.any_op):
// expected-note @below {{allocated here}}
%0 = transform.sequence %arg0 : !transform.any_op -> !transform.any_op failures(propagate) attributes { ord = 1 } {
^bb1(%arg1: !transform.any_op):
yield %arg1 : !transform.any_op
}
transform.sequence %0 : !transform.any_op failures(propagate) attributes { ord = 2 } {
^bb2(%arg2: !transform.any_op):
}
transform.sequence %0 : !transform.any_op failures(propagate) attributes { ord = 3 } {
^bb3(%arg3: !transform.any_op):
}
// expected-note @below {{freed here}}
test_consume_operand_of_op_kind_or_fail %0, "transform.sequence" : !transform.any_op
// expected-warning @below {{operand #0 may be used after free}}
transform.sequence %0 : !transform.any_op failures(propagate) attributes { ord = 5 } {
^bb3(%arg3: !transform.any_op):
}
}
return
}
// -----
// In the case of a control flow cycle, the operation that uses the value may
// precede the one that frees it in the same block. Both operations should
// be reported as use-after-free.
func.func @use_after_free_self_cycle() {
// expected-note @below {{allocated here}}
%0 = transform.test_produce_self_handle_or_forward_operand : () -> !transform.any_op
transform.test_transform_op_with_regions {
"transform.test_branching_transform_op_terminator"() : () -> ()
},
{
^bb0:
"transform.test_branching_transform_op_terminator"()[^bb1] : () -> ()
^bb1:
// expected-warning @below {{operand #0 may be used after free}}
transform.sequence %0 : !transform.any_op failures(propagate) {
^bb0(%arg0: !transform.any_op):
}
// expected-warning @below {{operand #0 may be used after free}}
// expected-note @below {{freed here}}
transform.test_consume_operand_of_op_kind_or_fail %0, "transform.test_produce_self_handle_or_forward_operand" : !transform.any_op
"transform.test_branching_transform_op_terminator"()[^bb1, ^bb2] : () -> ()
^bb2:
"transform.test_branching_transform_op_terminator"() : () -> ()
}
return
}
// -----
// Check that the "free" that happens in a cycle is also reported as potential
// use-after-free.
func.func @use_after_free_cycle() {
// expected-note @below {{allocated here}}
%0 = transform.test_produce_self_handle_or_forward_operand : () -> !transform.any_op
transform.test_transform_op_with_regions {
"transform.test_branching_transform_op_terminator"() : () -> ()
},
{
^bb0:
"transform.test_branching_transform_op_terminator"()[^bb1, ^bb2] : () -> ()
^bb1:
// expected-warning @below {{operand #0 may be used after free}}
// expected-note @below {{freed here}}
transform.test_consume_operand_of_op_kind_or_fail %0, "transform.test_produce_self_handle_or_forward_operand" : !transform.any_op
"transform.test_branching_transform_op_terminator"()[^bb2, ^bb3] : () -> ()
^bb2:
"transform.test_branching_transform_op_terminator"()[^bb1] : () -> ()
^bb3:
"transform.test_branching_transform_op_terminator"() : () -> ()
}
return
}
// -----
// This should not crash.
transform.sequence failures(propagate) {
^bb0(%arg0: !transform.any_op):
alternatives %arg0 : !transform.any_op {
^bb0(%arg1: !transform.any_op):
}
}
|
