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
|
; RUN: llc < %s | FileCheck %s
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i686-pc-windows-msvc"
define void @try_except() #0 personality i8* bitcast (i32 (...)* @_except_handler3 to i8*) {
entry:
%__exception_code = alloca i32, align 4
call void (...) @llvm.localescape(i32* %__exception_code)
invoke void @f(i32 1) #3
to label %invoke.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%cs1 = catchswitch within none [label %__except.ret] unwind to caller
__except.ret: ; preds = %catch.dispatch
%0 = catchpad within %cs1 [i8* bitcast (i32 ()* @try_except_filter_catchall to i8*)]
catchret from %0 to label %__except
__except: ; preds = %__except.ret
call void @f(i32 2)
br label %__try.cont
__try.cont: ; preds = %__except, %invoke.cont
call void @f(i32 3)
ret void
invoke.cont: ; preds = %entry
br label %__try.cont
}
; CHECK-LABEL: _try_except:
; Store state #0
; CHECK: movl $0, -[[state:[0-9]+]](%ebp)
; CHECK: pushl $1
; CHECK: calll _f
; CHECK: movl $-1, -[[state]](%ebp)
; CHECK: pushl $3
; CHECK: calll _f
; CHECK: retl
; __except
; CHECK: movl $-1, -[[state]](%ebp)
; CHECK: pushl $2
; CHECK: calll _f
; CHECK: .section .xdata,"dr"
; CHECK: L__ehtable$try_except:
; CHECK: .long -1 # ToState
; CHECK: .long _try_except_filter_catchall # Filter
; CHECK: .long LBB0_1
define internal i32 @try_except_filter_catchall() #0 {
entry:
%0 = call i8* @llvm.frameaddress(i32 1)
%1 = call i8* @llvm.x86.seh.recoverfp(i8* bitcast (void ()* @try_except to i8*), i8* %0)
%2 = call i8* @llvm.localrecover(i8* bitcast (void ()* @try_except to i8*), i8* %1, i32 0)
%__exception_code = bitcast i8* %2 to i32*
%3 = getelementptr inbounds i8, i8* %0, i32 -20
%4 = bitcast i8* %3 to i8**
%5 = load i8*, i8** %4, align 4
%6 = bitcast i8* %5 to { i32*, i8* }*
%7 = getelementptr inbounds { i32*, i8* }, { i32*, i8* }* %6, i32 0, i32 0
%8 = load i32*, i32** %7, align 4
%9 = load i32, i32* %8, align 4
store i32 %9, i32* %__exception_code, align 4
ret i32 1
}
define void @nested_exceptions() #0 personality i8* bitcast (i32 (...)* @_except_handler3 to i8*) {
entry:
%__exception_code = alloca i32, align 4
call void (...) @llvm.localescape(i32* %__exception_code)
invoke void @crash() #3
to label %__try.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%cs1 = catchswitch within none [label %__except.ret] unwind label %catch.dispatch.11
__except.ret: ; preds = %catch.dispatch
%0 = catchpad within %cs1 [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)]
catchret from %0 to label %__try.cont
__try.cont: ; preds = %entry, %__except.ret
invoke void @crash() #3
to label %__try.cont.9 unwind label %catch.dispatch.5
catch.dispatch.5: ; preds = %__try.cont
%cs2 = catchswitch within none [label %__except.ret.7] unwind label %catch.dispatch.11
__except.ret.7: ; preds = %catch.dispatch.5
%1 = catchpad within %cs2 [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)]
catchret from %1 to label %__try.cont.9
__try.cont.9: ; preds = %__try.cont, %__except.ret.7
invoke void @crash() #3
to label %__try.cont.15 unwind label %catch.dispatch.11
catch.dispatch.11: ; preds = %catchendblock, %catchendblock.6, %__try.cont.9
%cs3 = catchswitch within none [label %__except.ret.13] unwind label %catch.dispatch.17
__except.ret.13: ; preds = %catch.dispatch.11
%2 = catchpad within %cs3 [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)]
catchret from %2 to label %__try.cont.15
__try.cont.15: ; preds = %__try.cont.9, %__except.ret.13
invoke void @crash() #3
to label %__try.cont.35 unwind label %catch.dispatch.17
catch.dispatch.17: ; preds = %catchendblock.12, %__try.cont.15
%cs4 = catchswitch within none [label %__except.ret.19] unwind to caller
__except.ret.19: ; preds = %catch.dispatch.17
%3 = catchpad within %cs4 [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)]
catchret from %3 to label %__except.20
__except.20: ; preds = %__except.ret.19
invoke void @crash() #3
to label %__try.cont.27 unwind label %catch.dispatch.23
catch.dispatch.23: ; preds = %__except.20
%cs5 = catchswitch within none [label %__except.ret.25] unwind to caller
__except.ret.25: ; preds = %catch.dispatch.23
%4 = catchpad within %cs5 [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)]
catchret from %4 to label %__try.cont.27
__try.cont.27: ; preds = %__except.20, %__except.ret.25
invoke void @crash() #3
to label %__try.cont.35 unwind label %catch.dispatch.30
catch.dispatch.30: ; preds = %__try.cont.27
%cs6 = catchswitch within none [label %__except.ret.32] unwind to caller
__except.ret.32: ; preds = %catch.dispatch.30
%5 = catchpad within %cs6 [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)]
catchret from %5 to label %__try.cont.35
__try.cont.35: ; preds = %__try.cont.15, %__try.cont.27, %__except.ret.32
ret void
}
; This table is equivalent to the one produced by MSVC, even if it isn't in
; quite the same order.
; CHECK-LABEL: _nested_exceptions:
; CHECK: L__ehtable$nested_exceptions:
; CHECK: .long -1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long 0
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long 1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long 1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long -1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long -1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
declare void @crash() #0
define internal i32 @nested_exceptions_filter_catchall() #0 {
entry:
%0 = call i8* @llvm.frameaddress(i32 1)
%1 = call i8* @llvm.x86.seh.recoverfp(i8* bitcast (void ()* @nested_exceptions to i8*), i8* %0)
%2 = call i8* @llvm.localrecover(i8* bitcast (void ()* @nested_exceptions to i8*), i8* %1, i32 0)
%__exception_code3 = bitcast i8* %2 to i32*
%3 = getelementptr inbounds i8, i8* %0, i32 -20
%4 = bitcast i8* %3 to i8**
%5 = load i8*, i8** %4, align 4
%6 = bitcast i8* %5 to { i32*, i8* }*
%7 = getelementptr inbounds { i32*, i8* }, { i32*, i8* }* %6, i32 0, i32 0
%8 = load i32*, i32** %7, align 4
%9 = load i32, i32* %8, align 4
store i32 %9, i32* %__exception_code3, align 4
ret i32 1
}
define void @code_in_catchpad() #0 personality i8* bitcast (i32 (...)* @_except_handler3 to i8*) {
entry:
invoke void @f(i32 1) #3
to label %__except unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%cs1 = catchswitch within none [label %__except.ret] unwind to caller
__except.ret: ; preds = %catch.dispatch
%0 = catchpad within %cs1 [i8* bitcast (i32 ()* @try_except_filter_catchall to i8*)]
call void @f(i32 2) [ "funclet"(token %0) ]
catchret from %0 to label %__except
__except:
ret void
}
; CHECK-LABEL: _code_in_catchpad:
; CHECK: # %__except.ret
; CHECK-NEXT: movl -24(%ebp), %esp
; CHECK-NEXT: addl $12, %ebp
; CHECK-NEXT: movl $-1, -16(%ebp)
; CHECK-NEXT: pushl $2
; CHECK-NEXT: calll _f
; Function Attrs: nounwind readnone
declare i8* @llvm.frameaddress(i32) #1
; Function Attrs: nounwind readnone
declare i8* @llvm.x86.seh.recoverfp(i8*, i8*) #1
; Function Attrs: nounwind readnone
declare i8* @llvm.localrecover(i8*, i8*, i32) #1
declare void @f(i32) #0
declare i32 @_except_handler3(...)
; Function Attrs: nounwind
declare void @llvm.localescape(...) #2
attributes #0 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind }
attributes #3 = { noinline }
|
