1; RUN: llc < %s -disable-wasm-fallthrough-return-opt -wasm-keep-registers -wasm-enable-eh -exception-model=wasm -mattr=+exception-handling | FileCheck -allow-deprecated-dag-overlap %s
2
3target triple = "wasm32-unknown-unknown"
4
5@_ZTIi = external constant i8*
6@_ZTIf = external constant i8*
7@_ZTId = external constant i8*
8
9; Single catch (...) does not need an exception table.
10;
11; try {
12;   may_throw();
13; } catch (...) {
14; }
15; CHECK-LABEL: test0:
16; CHECK-NOT: GCC_except_table
17define void @test0() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
18entry:
19  invoke void @may_throw()
20          to label %try.cont unwind label %catch.dispatch
21
22catch.dispatch:                                   ; preds = %entry
23  %0 = catchswitch within none [label %catch.start] unwind to caller
24
25catch.start:                                      ; preds = %catch.dispatch
26  %1 = catchpad within %0 [i8* null]
27  %2 = call i8* @llvm.wasm.get.exception(token %1)
28  %3 = call i32 @llvm.wasm.get.ehselector(token %1)
29  %4 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
30  call void @__cxa_end_catch() [ "funclet"(token %1) ]
31  catchret from %1 to label %try.cont
32
33try.cont:                                         ; preds = %entry, %catch.start
34  ret void
35}
36
37; Exception table generation + shared action test.
38;
39; try {
40;   may_throw();
41; } catch (int) {
42; } catch (float) {
43; } catch (double) {
44; } catch (...) {
45; }
46;
47; try {
48;   may_throw();
49; } catch (double) {
50; } catch (...) {
51; }
52;
53; try {
54;   may_throw();
55; } catch (int) {
56; } catch (float) {
57; }
58;
59; There are three landing pads. The second landing pad should share action table
60; entries with the first landing pad because they end with the same sequence
61; (double -> ...). But the third landing table cannot share action table entries
62; with others, so it should create its own entries.
63; CHECK-LABEL: test1:
64; CHECK: .section  .rodata.gcc_except_table,"",@
65; CHECK-NEXT:   .p2align  2
66; CHECK-NEXT: GCC_except_table[[START:[0-9]+]]:
67; CHECK-NEXT: .Lexception0:
68; CHECK-NEXT:   .int8  255                     # @LPStart Encoding = omit
69; CHECK-NEXT:   .int8  0                       # @TType Encoding = absptr
70; CHECK-NEXT:   .uleb128 .Lttbase0-.Lttbaseref0
71; CHECK-NEXT: .Lttbaseref0:
72; CHECK-NEXT:   .int8  1                       # Call site Encoding = uleb128
73; CHECK-NEXT:   .uleb128 .Lcst_end0-.Lcst_begin0
74; CHECK-NEXT: .Lcst_begin0:
75; CHECK-NEXT:   .int8  0                       # >> Call Site 0 <<
76; CHECK-NEXT:                                  #   On exception at call site 0
77; CHECK-NEXT:   .int8  7                       #   Action: 4
78; CHECK-NEXT:   .int8  1                       # >> Call Site 1 <<
79; CHECK-NEXT:                                  #   On exception at call site 1
80; CHECK-NEXT:   .int8  3                       #   Action: 2
81; CHECK-NEXT:   .int8  2                       # >> Call Site 2 <<
82; CHECK-NEXT:                                  #   On exception at call site 2
83; CHECK-NEXT:   .int8  11                      #   Action: 6
84; CHECK-NEXT: .Lcst_end0:
85; CHECK-NEXT:   .int8  1                       # >> Action Record 1 <<
86; CHECK-NEXT:                                  #   Catch TypeInfo 1
87; CHECK-NEXT:   .int8  0                       #   No further actions
88; CHECK-NEXT:   .int8  2                       # >> Action Record 2 <<
89; CHECK-NEXT:                                  #   Catch TypeInfo 2
90; CHECK-NEXT:   .int8  125                     #   Continue to action 1
91; CHECK-NEXT:   .int8  3                       # >> Action Record 3 <<
92; CHECK-NEXT:                                  #   Catch TypeInfo 3
93; CHECK-NEXT:   .int8  125                     #   Continue to action 2
94; CHECK-NEXT:   .int8  4                       # >> Action Record 4 <<
95; CHECK-NEXT:                                  #   Catch TypeInfo 4
96; CHECK-NEXT:   .int8  125                     #   Continue to action 3
97; CHECK-NEXT:   .int8  3                       # >> Action Record 5 <<
98; CHECK-NEXT:                                  #   Catch TypeInfo 3
99; CHECK-NEXT:   .int8  0                       #   No further actions
100; CHECK-NEXT:   .int8  4                       # >> Action Record 6 <<
101; CHECK-NEXT:                                  #   Catch TypeInfo 4
102; CHECK-NEXT:   .int8  125                     #   Continue to action 5
103; CHECK-NEXT:   .p2align  2
104; CHECK-NEXT:                                  # >> Catch TypeInfos <<
105; CHECK-NEXT:   .int32  _ZTIi                  # TypeInfo 4
106; CHECK-NEXT:   .int32  _ZTIf                  # TypeInfo 3
107; CHECK-NEXT:   .int32  _ZTId                  # TypeInfo 2
108; CHECK-NEXT:   .int32  0                      # TypeInfo 1
109; CHECK-NEXT: .Lttbase0:
110; CHECK-NEXT:   .p2align  2
111; CHECK-NEXT: .LGCC_except_table_end[[END:[0-9]+]]:
112; CHECK-NEXT:   .size  GCC_except_table[[START]], .LGCC_except_table_end[[END]]-GCC_except_table[[START]]
113define void @test1() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
114entry:
115  invoke void @may_throw()
116          to label %try.cont unwind label %catch.dispatch
117
118catch.dispatch:                                   ; preds = %entry
119  %0 = catchswitch within none [label %catch.start] unwind to caller
120
121catch.start:                                      ; preds = %catch.dispatch
122  %1 = catchpad within %0 [i8* bitcast (i8** @_ZTIi to i8*), i8* bitcast (i8** @_ZTIf to i8*), i8* bitcast (i8** @_ZTId to i8*), i8* null]
123  %2 = call i8* @llvm.wasm.get.exception(token %1)
124  %3 = call i32 @llvm.wasm.get.ehselector(token %1)
125  %4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
126  %matches = icmp eq i32 %3, %4
127  br i1 %matches, label %catch10, label %catch.fallthrough
128
129catch10:                                          ; preds = %catch.start
130  %5 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
131  %6 = bitcast i8* %5 to i32*
132  %7 = load i32, i32* %6, align 4
133  call void @__cxa_end_catch() [ "funclet"(token %1) ]
134  catchret from %1 to label %try.cont
135
136try.cont:                                         ; preds = %entry, %catch, %catch4, %catch7, %catch10
137  invoke void @may_throw()
138          to label %try.cont23 unwind label %catch.dispatch14
139
140catch.dispatch14:                                 ; preds = %try.cont
141  %8 = catchswitch within none [label %catch.start15] unwind to caller
142
143catch.start15:                                    ; preds = %catch.dispatch14
144  %9 = catchpad within %8 [i8* bitcast (i8** @_ZTId to i8*), i8* null]
145  %10 = call i8* @llvm.wasm.get.exception(token %9)
146  %11 = call i32 @llvm.wasm.get.ehselector(token %9)
147  %12 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTId to i8*))
148  %matches16 = icmp eq i32 %11, %12
149  %13 = call i8* @__cxa_begin_catch(i8* %10) [ "funclet"(token %9) ]
150  br i1 %matches16, label %catch20, label %catch17
151
152catch20:                                          ; preds = %catch.start15
153  %14 = bitcast i8* %13 to double*
154  %15 = load double, double* %14, align 8
155  call void @__cxa_end_catch() [ "funclet"(token %9) ]
156  catchret from %9 to label %try.cont23
157
158try.cont23:                                       ; preds = %try.cont, %catch17, %catch20
159  invoke void @may_throw()
160          to label %try.cont36 unwind label %catch.dispatch25
161
162catch.dispatch25:                                 ; preds = %try.cont23
163  %16 = catchswitch within none [label %catch.start26] unwind to caller
164
165catch.start26:                                    ; preds = %catch.dispatch25
166  %17 = catchpad within %16 [i8* bitcast (i8** @_ZTIi to i8*), i8* bitcast (i8** @_ZTIf to i8*)]
167  %18 = call i8* @llvm.wasm.get.exception(token %17)
168  %19 = call i32 @llvm.wasm.get.ehselector(token %17)
169  %20 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
170  %matches27 = icmp eq i32 %19, %20
171  br i1 %matches27, label %catch33, label %catch.fallthrough28
172
173catch33:                                          ; preds = %catch.start26
174  %21 = call i8* @__cxa_begin_catch(i8* %18) [ "funclet"(token %17) ]
175  %22 = bitcast i8* %21 to i32*
176  %23 = load i32, i32* %22, align 4
177  call void @__cxa_end_catch() [ "funclet"(token %17) ]
178  catchret from %17 to label %try.cont36
179
180catch.fallthrough28:                              ; preds = %catch.start26
181  %24 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIf to i8*))
182  %matches29 = icmp eq i32 %19, %24
183  br i1 %matches29, label %catch30, label %rethrow
184
185catch30:                                          ; preds = %catch.fallthrough28
186  %25 = call i8* @__cxa_begin_catch(i8* %18) [ "funclet"(token %17) ]
187  %26 = bitcast i8* %25 to float*
188  %27 = load float, float* %26, align 4
189  call void @__cxa_end_catch() [ "funclet"(token %17) ]
190  catchret from %17 to label %try.cont36
191
192rethrow:                                          ; preds = %catch.fallthrough28
193  call void @__cxa_rethrow() [ "funclet"(token %17) ]
194  unreachable
195
196try.cont36:                                       ; preds = %try.cont23, %catch30, %catch33
197  ret void
198
199catch17:                                          ; preds = %catch.start15
200  call void @__cxa_end_catch() [ "funclet"(token %9) ]
201  catchret from %9 to label %try.cont23
202
203catch.fallthrough:                                ; preds = %catch.start
204  %28 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIf to i8*))
205  %matches1 = icmp eq i32 %3, %28
206  br i1 %matches1, label %catch7, label %catch.fallthrough2
207
208catch7:                                           ; preds = %catch.fallthrough
209  %29 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
210  %30 = bitcast i8* %29 to float*
211  %31 = load float, float* %30, align 4
212  call void @__cxa_end_catch() [ "funclet"(token %1) ]
213  catchret from %1 to label %try.cont
214
215catch.fallthrough2:                               ; preds = %catch.fallthrough
216  %32 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTId to i8*))
217  %matches3 = icmp eq i32 %3, %32
218  %33 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ]
219  br i1 %matches3, label %catch4, label %catch
220
221catch4:                                           ; preds = %catch.fallthrough2
222  %34 = bitcast i8* %33 to double*
223  %35 = load double, double* %34, align 8
224  call void @__cxa_end_catch() [ "funclet"(token %1) ]
225  catchret from %1 to label %try.cont
226
227catch:                                            ; preds = %catch.fallthrough2
228  call void @__cxa_end_catch() [ "funclet"(token %1) ]
229  catchret from %1 to label %try.cont
230}
231
232declare void @may_throw()
233; Function Attrs: nounwind
234declare i32 @llvm.eh.typeid.for(i8*) #0
235; Function Attrs: nounwind
236declare i8* @llvm.wasm.get.exception(token) #0
237; Function Attrs: nounwind
238declare i32 @llvm.wasm.get.ehselector(token) #0
239declare void @__cxa_rethrow()
240declare i8* @__cxa_begin_catch(i8*)
241declare void @__cxa_end_catch()
242declare i32 @__gxx_wasm_personality_v0(...)
243
244attributes #0 = { nounwind }
245