1; RUN: not --crash llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-keep-registers -exception-model=wasm 2; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -exception-model=wasm -mattr=+exception-handling -verify-machineinstrs | FileCheck -allow-deprecated-dag-overlap %s 3; RUN: llc < %s -disable-wasm-fallthrough-return-opt -wasm-keep-registers -exception-model=wasm -mattr=+exception-handling 4 5target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128" 6target triple = "wasm32-unknown-unknown" 7 8%struct.Temp = type { i8 } 9 10@_ZTIi = external constant i8* 11 12; CHECK-LABEL: test_throw: 13; CHECK: throw __cpp_exception, $0 14; CHECK-NOT: unreachable 15define void @test_throw(i8* %p) { 16 call void @llvm.wasm.throw(i32 0, i8* %p) 17 ret void 18} 19 20; Simple test with a try-catch 21; 22; void foo(); 23; void test_catch() { 24; try { 25; foo(); 26; } catch (int) { 27; } 28; } 29 30; CHECK-LABEL: test_catch: 31; CHECK: global.get ${{.+}}=, __stack_pointer 32; CHECK: try 33; CHECK: call foo 34; CHECK: catch $[[EXNREF:[0-9]+]]= 35; CHECK: global.set __stack_pointer 36; CHECK: block i32 37; CHECK: br_on_exn 0, __cpp_exception, $[[EXNREF]] 38; CHECK: rethrow $[[EXNREF]] 39; CHECK: end_block 40; CHECK: extract_exception $[[EXN:[0-9]+]]= 41; CHECK-DAG: i32.store __wasm_lpad_context 42; CHECK-DAG: i32.store __wasm_lpad_context+4 43; CHECK: call $drop=, _Unwind_CallPersonality, $[[EXN]] 44; CHECK: block 45; CHECK: br_if 0 46; CHECK: call $drop=, __cxa_begin_catch 47; CHECK: call __cxa_end_catch 48; CHECK: br 1 49; CHECK: end_block 50; CHECK: rethrow $[[EXNREF]] 51; CHECK: end_try 52define void @test_catch() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { 53entry: 54 invoke void @foo() 55 to label %try.cont unwind label %catch.dispatch 56 57catch.dispatch: ; preds = %entry 58 %0 = catchswitch within none [label %catch.start] unwind to caller 59 60catch.start: ; preds = %catch.dispatch 61 %1 = catchpad within %0 [i8* bitcast (i8** @_ZTIi to i8*)] 62 %2 = call i8* @llvm.wasm.get.exception(token %1) 63 %3 = call i32 @llvm.wasm.get.ehselector(token %1) 64 %4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*)) 65 %matches = icmp eq i32 %3, %4 66 br i1 %matches, label %catch, label %rethrow 67 68catch: ; preds = %catch.start 69 %5 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ] 70 call void @__cxa_end_catch() [ "funclet"(token %1) ] 71 catchret from %1 to label %try.cont 72 73rethrow: ; preds = %catch.start 74 call void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %1) ] 75 unreachable 76 77try.cont: ; preds = %catch, %entry 78 ret void 79} 80 81; Destructor (cleanup) test 82; 83; void foo(); 84; struct Temp { 85; ~Temp() {} 86; }; 87; void test_cleanup() { 88; Temp t; 89; foo(); 90; } 91 92; CHECK-LABEL: test_cleanup: 93; CHECK: try 94; CHECK: call foo 95; CHECK: catch $[[EXNREF:[0-9]+]]= 96; CHECK: global.set __stack_pointer 97; CHECK: call $drop=, _ZN4TempD2Ev 98; CHECK: rethrow $[[EXNREF]] 99; CHECK: end_try 100define void @test_cleanup() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { 101entry: 102 %t = alloca %struct.Temp, align 1 103 invoke void @foo() 104 to label %invoke.cont unwind label %ehcleanup 105 106invoke.cont: ; preds = %entry 107 %call = call %struct.Temp* @_ZN4TempD2Ev(%struct.Temp* %t) 108 ret void 109 110ehcleanup: ; preds = %entry 111 %0 = cleanuppad within none [] 112 %call1 = call %struct.Temp* @_ZN4TempD2Ev(%struct.Temp* %t) [ "funclet"(token %0) ] 113 cleanupret from %0 unwind to caller 114} 115 116; Calling a function that may throw within a 'catch (...)' generates a 117; temrinatepad, because __cxa_end_catch() also can throw within 'catch (...)'. 118; 119; void foo(); 120; void test_terminatepad() { 121; try { 122; foo(); 123; } catch (...) { 124; foo(); 125; } 126; } 127 128; CHECK-LABEL: test_terminatepad 129; CHECK: try 130; CHECK: call foo 131; CHECK: catch 132; CHECK: call $drop=, __cxa_begin_catch 133; CHECK: try 134; CHECK: call foo 135; CHECK: catch 136; CHECK: try 137; CHECK: call __cxa_end_catch 138; CHECK: catch 139; CHECK: block i32 140; CHECK: br_on_exn 0, __cpp_exception 141; CHECK: i32.const ${{.*}}=, 0 142; CHECK: call __clang_call_terminate 143; CHECK: unreachable 144; CHECK: end_block 145; CHECK: call __clang_call_terminate 146; CHECK: unreachable 147; CHECK: end_try 148; CHECK: rethrow 149; CHECK: end_try 150; CHECK: call __cxa_end_catch 151; CHECK: end_try 152define void @test_terminatepad() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { 153entry: 154 invoke void @foo() 155 to label %try.cont unwind label %catch.dispatch 156 157catch.dispatch: ; preds = %entry 158 %0 = catchswitch within none [label %catch.start] unwind to caller 159 160catch.start: ; preds = %catch.dispatch 161 %1 = catchpad within %0 [i8* null] 162 %2 = call i8* @llvm.wasm.get.exception(token %1) 163 %3 = call i32 @llvm.wasm.get.ehselector(token %1) 164 %4 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ] 165 invoke void @foo() [ "funclet"(token %1) ] 166 to label %invoke.cont1 unwind label %ehcleanup 167 168invoke.cont1: ; preds = %catch.start 169 call void @__cxa_end_catch() [ "funclet"(token %1) ] 170 catchret from %1 to label %try.cont 171 172try.cont: ; preds = %invoke.cont1, %entry 173 ret void 174 175ehcleanup: ; preds = %catch.start 176 %5 = cleanuppad within %1 [] 177 invoke void @__cxa_end_catch() [ "funclet"(token %5) ] 178 to label %invoke.cont2 unwind label %terminate 179 180invoke.cont2: ; preds = %ehcleanup 181 cleanupret from %5 unwind to caller 182 183terminate: ; preds = %ehcleanup 184 %6 = cleanuppad within %5 [] 185 %7 = call i8* @llvm.wasm.get.exception(token %6) 186 call void @__clang_call_terminate(i8* %7) [ "funclet"(token %6) ] 187 unreachable 188} 189 190; Tests prologues and epilogues are not generated within EH scopes. 191; They should not be treated as funclets; BBs starting with a catch instruction 192; should not have a prologue, and BBs ending with a catchret/cleanupret should 193; not have an epilogue. This is separate from __stack_pointer restoring 194; instructions after a catch instruction. 195; 196; void bar(int) noexcept; 197; void test_no_prolog_epilog_in_ehpad() { 198; int stack_var = 0; 199; bar(stack_var); 200; try { 201; foo(); 202; } catch (int) { 203; foo(); 204; } 205; } 206 207; CHECK-LABEL: test_no_prolog_epilog_in_ehpad 208; CHECK: try 209; CHECK: call foo 210; CHECK: catch 211; CHECK-NOT: global.get $push{{.+}}=, __stack_pointer 212; CHECK: global.set __stack_pointer 213; CHECK: block 214; CHECK: block 215; CHECK: br_if 0 216; CHECK: call $drop=, __cxa_begin_catch 217; CHECK: try 218; CHECK: call foo 219; CHECK: catch 220; CHECK-NOT: global.get $push{{.+}}=, __stack_pointer 221; CHECK: global.set __stack_pointer 222; CHECK: call __cxa_end_catch 223; CHECK: rethrow 224; CHECK-NOT: global.set __stack_pointer, $pop{{.+}} 225; CHECK: end_try 226; CHECK: end_block 227; CHECK: rethrow 228; CHECK: end_block 229; CHECK-NOT: global.set __stack_pointer, $pop{{.+}} 230; CHECK: call __cxa_end_catch 231; CHECK: end_try 232define void @test_no_prolog_epilog_in_ehpad() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { 233entry: 234 %stack_var = alloca i32, align 4 235 call void @bar(i32* %stack_var) 236 invoke void @foo() 237 to label %try.cont unwind label %catch.dispatch 238 239catch.dispatch: ; preds = %entry 240 %0 = catchswitch within none [label %catch.start] unwind to caller 241 242catch.start: ; preds = %catch.dispatch 243 %1 = catchpad within %0 [i8* bitcast (i8** @_ZTIi to i8*)] 244 %2 = call i8* @llvm.wasm.get.exception(token %1) 245 %3 = call i32 @llvm.wasm.get.ehselector(token %1) 246 %4 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*)) 247 %matches = icmp eq i32 %3, %4 248 br i1 %matches, label %catch, label %rethrow 249 250catch: ; preds = %catch.start 251 %5 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ] 252 %6 = bitcast i8* %5 to float* 253 %7 = load float, float* %6, align 4 254 invoke void @foo() [ "funclet"(token %1) ] 255 to label %invoke.cont1 unwind label %ehcleanup 256 257invoke.cont1: ; preds = %catch 258 call void @__cxa_end_catch() [ "funclet"(token %1) ] 259 catchret from %1 to label %try.cont 260 261rethrow: ; preds = %catch.start 262 call void @llvm.wasm.rethrow.in.catch() [ "funclet"(token %1) ] 263 unreachable 264 265try.cont: ; preds = %invoke.cont1, %entry 266 ret void 267 268ehcleanup: ; preds = %catch 269 %8 = cleanuppad within %1 [] 270 call void @__cxa_end_catch() [ "funclet"(token %8) ] 271 cleanupret from %8 unwind to caller 272} 273 274; When a function does not have stack-allocated objects, it does not need to 275; store SP back to __stack_pointer global at the epilog. 276; 277; void foo(); 278; void test_no_sp_writeback() { 279; try { 280; foo(); 281; } catch (...) { 282; } 283; } 284 285; CHECK-LABEL: test_no_sp_writeback 286; CHECK: try 287; CHECK: call foo 288; CHECK: catch 289; CHECK: call $drop=, __cxa_begin_catch 290; CHECK: call __cxa_end_catch 291; CHECK: end_try 292; CHECK-NOT: global.set __stack_pointer 293; CHECK: return 294define void @test_no_sp_writeback() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { 295entry: 296 invoke void @foo() 297 to label %try.cont unwind label %catch.dispatch 298 299catch.dispatch: ; preds = %entry 300 %0 = catchswitch within none [label %catch.start] unwind to caller 301 302catch.start: ; preds = %catch.dispatch 303 %1 = catchpad within %0 [i8* null] 304 %2 = call i8* @llvm.wasm.get.exception(token %1) 305 %3 = call i32 @llvm.wasm.get.ehselector(token %1) 306 %4 = call i8* @__cxa_begin_catch(i8* %2) [ "funclet"(token %1) ] 307 call void @__cxa_end_catch() [ "funclet"(token %1) ] 308 catchret from %1 to label %try.cont 309 310try.cont: ; preds = %catch.start, %entry 311 ret void 312} 313 314; When the result of @llvm.wasm.get.exception is not used. This is created to 315; fix a bug in LateEHPrepare and this should not crash. 316define void @test_get_exception_wo_use() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { 317entry: 318 invoke void @foo() 319 to label %try.cont unwind label %catch.dispatch 320 321catch.dispatch: ; preds = %entry 322 %0 = catchswitch within none [label %catch.start] unwind to caller 323 324catch.start: ; preds = %catch.dispatch 325 %1 = catchpad within %0 [i8* null] 326 %2 = call i8* @llvm.wasm.get.exception(token %1) 327 %3 = call i32 @llvm.wasm.get.ehselector(token %1) 328 catchret from %1 to label %try.cont 329 330try.cont: ; preds = %catch.start, %entry 331 ret void 332} 333 334; Tests a case when a cleanup region (cleanuppad ~ clanupret) contains another 335; catchpad 336define void @test_complex_cleanup_region() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) { 337entry: 338 invoke void @foo() 339 to label %invoke.cont unwind label %ehcleanup 340 341invoke.cont: ; preds = %entry 342 ret void 343 344ehcleanup: ; preds = %entry 345 %0 = cleanuppad within none [] 346 invoke void @foo() [ "funclet"(token %0) ] 347 to label %ehcleanupret unwind label %catch.dispatch 348 349catch.dispatch: ; preds = %ehcleanup 350 %1 = catchswitch within %0 [label %catch.start] unwind label %ehcleanup.1 351 352catch.start: ; preds = %catch.dispatch 353 %2 = catchpad within %1 [i8* null] 354 %3 = call i8* @llvm.wasm.get.exception(token %2) 355 %4 = call i32 @llvm.wasm.get.ehselector(token %2) 356 catchret from %2 to label %ehcleanupret 357 358ehcleanup.1: ; preds = %catch.dispatch 359 %5 = cleanuppad within %0 [] 360 unreachable 361 362ehcleanupret: ; preds = %catch.start, %ehcleanup 363 cleanupret from %0 unwind to caller 364} 365 366declare void @foo() 367declare void @bar(i32*) 368declare i32 @__gxx_wasm_personality_v0(...) 369declare void @llvm.wasm.throw(i32, i8*) 370declare i8* @llvm.wasm.get.exception(token) 371declare i32 @llvm.wasm.get.ehselector(token) 372declare void @llvm.wasm.rethrow.in.catch() 373declare i32 @llvm.eh.typeid.for(i8*) 374declare i8* @__cxa_begin_catch(i8*) 375declare void @__cxa_end_catch() 376declare void @__clang_call_terminate(i8*) 377declare %struct.Temp* @_ZN4TempD2Ev(%struct.Temp* returned) 378 379; CHECK: __cpp_exception: 380; CHECK: .eventtype __cpp_exception i32 381