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
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
| ; RUN: opt < %s -winehprepare -demote-catchswitch-only -wasmehprepare -S | FileCheck %s
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"
; CHECK: @__wasm_lpad_context = external global { i32, i8*, i32 }
@_ZTIi = external constant i8*
%struct.Temp = type { i8 }
; A single 'catch (int)' clause.
; A wasm.catch() call, wasm.lsda() call, and personality call to generate a
; selector should all be genereated after the catchpad.
;
; void foo();
; void test0() {
; try {
; foo();
; } catch (int) {
; }
; }
define void @test0() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK-LABEL: @test0()
entry:
invoke void @foo()
to label %try.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [i8* bitcast (i8** @_ZTIi to i8*)]
%2 = call i8* @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch, label %rethrow
; CHECK: catch.start:
; CHECK-NEXT: %[[CATCHPAD:.*]] = catchpad
; CHECK-NEXT: %[[EXN:.*]] = call i8* @llvm.wasm.extract.exception()
; CHECK-NEXT: call void @llvm.wasm.landingpad.index(token %[[CATCHPAD]], i32 0)
; CHECK-NEXT: store i32 0, i32* getelementptr inbounds ({ i32, i8*, i32 }, { i32, i8*, i32 }* @__wasm_lpad_context, i32 0, i32 0)
; CHECK-NEXT: %[[LSDA:.*]] = call i8* @llvm.wasm.lsda()
; CHECK-NEXT: store i8* %[[LSDA]], i8** getelementptr inbounds ({ i32, i8*, i32 }, { i32, i8*, i32 }* @__wasm_lpad_context, i32 0, i32 1)
; CHECK-NEXT: call i32 @_Unwind_CallPersonality(i8* %[[EXN]]) {{.*}} [ "funclet"(token %[[CATCHPAD]]) ]
; CHECK-NEXT: %[[SELECTOR:.*]] = load i32, i32* getelementptr inbounds ({ i32, i8*, i32 }, { i32, i8*, i32 }* @__wasm_lpad_context, i32 0, i32 2)
; CHECK: icmp eq i32 %[[SELECTOR]]
catch: ; preds = %catch.start
%5 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
; CHECK: catch:
; CHECK-NEXT: call i8* @__cxa_begin_catch(i8* %[[EXN]])
rethrow: ; preds = %catch.start
call void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %1) ]
unreachable
try.cont: ; preds = %entry, %catch
ret void
}
; Two try-catches.
; For the catchpad with a single 'catch (...)', only a wasm.catch() call should
; be generated after the catchpad; wasm.landingpad.index() and personality call
; should NOT be generated. For the other catchpad, the argument of
; wasm.landingpad.index() should be not 1 but 0.
;
; void foo();
; void test1() {
; try {
; foo();
; } catch (...) {
; }
; try {
; foo();
; } catch (int) {
; }
; }
define void @test1() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK-LABEL: @test1()
entry:
invoke void @foo()
to label %try.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [i8* null]
%2 = call i8* @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
; CHECK: catch.start:
; CHECK-NEXT: catchpad within %0 [i8* null]
; CHECK-NOT: call void @llvm.wasm.landingpad.index
; CHECK-NOT: store {{.*}} @__wasm_lpad_context
; CHECK-NOT: call i8* @llvm.wasm.lsda()
; CHECK-NOT: call i32 @_Unwind_CallPersonality
; CHECK-NOT: load {{.*}} @__wasm_lpad_context
try.cont: ; preds = %entry, %catch.start
invoke void @foo()
to label %try.cont7 unwind label %catch.dispatch2
catch.dispatch2: ; preds = %try.cont
%5 = catchswitch within none [label %catch.start3] unwind to caller
catch.start3: ; preds = %catch.dispatch2
%6 = catchpad within %5 [i8* bitcast (i8** @_ZTIi to i8*)]
%7 = call i8* @llvm.wasm.get.exception(token %6)
%8 = call i32 @llvm.wasm.get.ehselector(token %6)
%9 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches = icmp eq i32 %8, %9
br i1 %matches, label %catch4, label %rethrow
; CHECK: catch.start3:
; CHECK: call void @llvm.wasm.landingpad.index(token %{{.+}}, i32 0)
catch4: ; preds = %catch.start3
%10 = call i8* @__cxa_begin_catch(i8* %7) [ "funclet"(token %6) ]
call void @__cxa_end_catch() [ "funclet"(token %6) ]
catchret from %6 to label %try.cont7
rethrow: ; preds = %catch.start3
call void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %6) ]
unreachable
try.cont7: ; preds = %try.cont, %catch4
ret void
}
; A nested try-catch within a catch.
;
; void foo();
; void test2() {
; try {
; foo();
; } catch (int) {
; try {
; foo();
; } catch (int) {
; }
; }
; }
; Within the nested catchpad, wasm.lsda() call should NOT be generated.
define void @test2() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK-LABEL: @test2()
entry:
invoke void @foo()
to label %try.cont9 unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [i8* bitcast (i8** @_ZTIi to i8*)]
%2 = call i8* @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch, label %rethrow
; CHECK: catch.start:
; CHECK: call i8* @llvm.wasm.lsda()
catch: ; preds = %catch.start
%5 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
invoke void @foo() [ "funclet"(token %1) ]
to label %try.cont unwind label %catch.dispatch2
catch.dispatch2: ; preds = %catch
%6 = catchswitch within %1 [label %catch.start3] unwind label %ehcleanup
catch.start3: ; preds = %catch.dispatch2
%7 = catchpad within %6 [i8* bitcast (i8** @_ZTIi to i8*)]
%8 = call i8* @llvm.wasm.get.exception(token %7)
%9 = call i32 @llvm.wasm.get.ehselector(token %7)
%10 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
%matches4 = icmp eq i32 %9, %10
br i1 %matches4, label %catch6, label %rethrow5
; CHECK: catch.start3:
; CHECK-NOT: call i8* @llvm.wasm.lsda()
catch6: ; preds = %catch.start3
%11 = call i8* @__cxa_begin_catch(i8* %8) [ "funclet"(token %7) ]
call void @__cxa_end_catch() [ "funclet"(token %7) ]
catchret from %7 to label %try.cont
rethrow5: ; preds = %catch.start3
invoke void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %7) ]
to label %unreachable unwind label %ehcleanup
try.cont: ; preds = %catch, %catch6
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont9
rethrow: ; preds = %catch.start
call void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %1) ]
unreachable
try.cont9: ; preds = %entry, %try.cont
ret void
ehcleanup: ; preds = %rethrow5, %catch.dispatch2
%12 = cleanuppad within %1 []
call void @__cxa_end_catch() [ "funclet"(token %12) ]
cleanupret from %12 unwind to caller
; CHECK: ehcleanup:
; CHECK-NEXT: cleanuppad
; CHECK-NOT: call void @llvm.wasm.landingpad.index
; CHECK-NOT: store {{.*}} @__wasm_lpad_context
; CHECK-NOT: call i8* @llvm.wasm.lsda()
; CHECK-NOT: call i32 @_Unwind_CallPersonality
; CHECK-NOT: load {{.*}} @__wasm_lpad_context
unreachable: ; preds = %rethrow5
unreachable
}
; A cleanuppad with a call to __clang_call_terminate().
; A call to wasm.catch() should be generated after the cleanuppad.
;
; void foo();
; void test3() {
; try {
; foo();
; } catch (...) {
; foo();
; }
; }
define void @test3() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK-LABEL: @test3
entry:
invoke void @foo()
to label %try.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [i8* null]
%2 = call i8* @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
invoke void @foo() [ "funclet"(token %1) ]
to label %invoke.cont1 unwind label %ehcleanup
invoke.cont1: ; preds = %catch.start
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
try.cont: ; preds = %entry, %invoke.cont1
ret void
ehcleanup: ; preds = %catch.start
%5 = cleanuppad within %1 []
invoke void @__cxa_end_catch() [ "funclet"(token %5) ]
to label %invoke.cont2 unwind label %terminate
invoke.cont2: ; preds = %ehcleanup
cleanupret from %5 unwind to caller
terminate: ; preds = %ehcleanup
%6 = cleanuppad within %5 []
%7 = call i8* @llvm.wasm.get.exception(token %6)
call void @__clang_call_terminate(i8* %7) [ "funclet"(token %6) ]
unreachable
; CHECK: terminate:
; CHECK-NEXT: cleanuppad
; CHECK-NEXT: %[[EXN:.*]] = call i8* @llvm.wasm.extract.exception
; CHECK-NEXT: call void @__clang_call_terminate(i8* %[[EXN]])
}
; PHI demotion test. Only the phi before catchswitch should be demoted; the phi
; before cleanuppad should NOT.
;
; void foo();
; int bar(int) noexcept;
; struct Temp {
; ~Temp() {}
; };
;
; void test4() {
; int num;
; try {
; Temp t;
; num = 1;
; foo();
; num = 2;
; foo();
; } catch (...) {
; bar(num);
; }
; try {
; foo();
; num = 1;
; foo();
; num = 2;
; } catch (...) {
; bar(num);
; }
; }
define void @test4() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
; CHECK-LABEL: @test4
entry:
%t = alloca %struct.Temp, align 1
invoke void @foo()
to label %invoke.cont unwind label %ehcleanup
invoke.cont: ; preds = %entry
invoke void @foo()
to label %invoke.cont1 unwind label %ehcleanup
invoke.cont1: ; preds = %invoke.cont
%call = call %struct.Temp* @_ZN4TempD2Ev(%struct.Temp* %t)
br label %try.cont
ehcleanup: ; preds = %invoke.cont, %entry
%num.0 = phi i32 [ 2, %invoke.cont ], [ 1, %entry ]
%0 = cleanuppad within none []
%call2 = call %struct.Temp* @_ZN4TempD2Ev(%struct.Temp* %t) [ "funclet"(token %0) ]
cleanupret from %0 unwind label %catch.dispatch
; CHECK: ehcleanup:
; CHECK-NEXT: = phi
catch.dispatch: ; preds = %ehcleanup
%1 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%2 = catchpad within %1 [i8* null]
%3 = call i8* @llvm.wasm.get.exception(token %2)
%4 = call i32 @llvm.wasm.get.ehselector(token %2)
%5 = call i8* @__cxa_begin_catch(i8* %3) [ "funclet"(token %2) ]
call void @bar(i32 %num.0) [ "funclet"(token %2) ]
call void @__cxa_end_catch() [ "funclet"(token %2) ]
catchret from %2 to label %try.cont
try.cont: ; preds = %catch.start, %invoke.cont1
invoke void @foo()
to label %invoke.cont3 unwind label %catch.dispatch5
invoke.cont3: ; preds = %try.cont
invoke void @foo()
to label %try.cont10 unwind label %catch.dispatch5
catch.dispatch5: ; preds = %invoke.cont3, %try.cont
%num.1 = phi i32 [ 2, %invoke.cont3 ], [ 1, %try.cont ]
%6 = catchswitch within none [label %catch.start6] unwind to caller
; CHECK: catch.dispatch5:
; CHECK-NOT: = phi
catch.start6: ; preds = %catch.dispatch5
%7 = catchpad within %6 [i8* null]
%8 = call i8* @llvm.wasm.get.exception(token %7)
%9 = call i32 @llvm.wasm.get.ehselector(token %7)
%10 = call i8* @__cxa_begin_catch(i8* %8) [ "funclet"(token %7) ]
call void @bar(i32 %num.1) [ "funclet"(token %7) ]
call void @__cxa_end_catch() [ "funclet"(token %7) ]
catchret from %7 to label %try.cont10
try.cont10: ; preds = %invoke.cont3, %catch.start6
ret void
}
; Tests if instructions after a call to @llvm.wasm.throw are deleted and the
; BB's dead children are deleted.
; CHECK-LABEL: @test5
define i32 @test5(i1 %b, i8* %p) {
entry:
br i1 %b, label %bb.true, label %bb.false
; CHECK: bb.true:
; CHECK-NEXT: call void @llvm.wasm.throw(i32 0, i8* %p)
; CHECK-NEXT: unreachable
bb.true: ; preds = %entry
call void @llvm.wasm.throw(i32 0, i8* %p)
br label %bb.true.0
; CHECK-NOT: bb.true.0
bb.true.0: ; preds = %bb.true
br label %merge
; CHECK: bb.false
bb.false: ; preds = %entry
br label %merge
; CHECK: merge
merge: ; preds = %bb.true.0, %bb.false
ret i32 0
}
declare void @foo()
declare void @bar(i32)
declare %struct.Temp* @_ZN4TempD2Ev(%struct.Temp* returned)
declare i32 @__gxx_wasm_personality_v0(...)
declare i8* @llvm.wasm.get.exception(token)
declare i32 @llvm.wasm.get.ehselector(token)
declare i32 @llvm.eh.typeid.for(i8*)
declare void @llvm.wasm.throw(i32, i8*)
declare void @llvm.wasm.rethrow.in.catch()
declare i8* @__cxa_begin_catch(i8*)
declare void @__cxa_end_catch()
declare void @__clang_call_terminate(i8*)
; CHECK-DAG: declare void @llvm.wasm.landingpad.index(token, i32 immarg)
; CHECK-DAG: declare i8* @llvm.wasm.lsda()
; CHECK-DAG: declare i32 @_Unwind_CallPersonality(i8*)
|