| ; RUN: opt < %s -wasm-lower-em-ehsjlj -enable-emscripten-cxx-exceptions -enable-emscripten-sjlj -S | FileCheck %s |
| ; RUN: llc < %s -enable-emscripten-cxx-exceptions -enable-emscripten-sjlj -verify-machineinstrs |
| |
| ; Tests for cases when exception handling and setjmp/longjmp handling are mixed. |
| |
| target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128" |
| target triple = "wasm32-unknown-unknown" |
| |
| %struct.__jmp_buf_tag = type { [6 x i32], i32, [32 x i32] } |
| |
| ; There is a function call (@foo) that can either throw an exception or longjmp |
| ; and there is also a setjmp call. When @foo throws, we have to check both for |
| ; exception and longjmp and jump to exception or longjmp handling BB depending |
| ; on the result. |
| define void @setjmp_longjmp_exception() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) { |
| ; CHECK-LABEL: @setjmp_longjmp_exception |
| entry: |
| %buf = alloca [1 x %struct.__jmp_buf_tag], align 16 |
| %arraydecay = getelementptr inbounds [1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* %buf, i32 0, i32 0 |
| %call = call i32 @setjmp(%struct.__jmp_buf_tag* %arraydecay) #0 |
| invoke void @foo() |
| to label %try.cont unwind label %lpad |
| |
| ; CHECK: entry.split.split: |
| ; CHECK: %[[CMP0:.*]] = icmp ne i32 %__THREW__.val, 0 |
| ; CHECK-NEXT: %__threwValue.val = load i32, i32* @__threwValue |
| ; CHECK-NEXT: %[[CMP1:.*]] = icmp ne i32 %__threwValue.val, 0 |
| ; CHECK-NEXT: %[[CMP:.*]] = and i1 %[[CMP0]], %[[CMP1]] |
| ; CHECK-NEXT: br i1 %[[CMP]], label %if.then1, label %if.else1 |
| |
| ; This is exception checking part. %if.else1 leads here |
| ; CHECK: entry.split.split.split: |
| ; CHECK-NEXT: %[[CMP:.*]] = icmp eq i32 %__THREW__.val, 1 |
| ; CHECK-NEXT: br i1 %[[CMP]], label %lpad, label %try.cont |
| |
| ; longjmp checking part |
| ; CHECK: if.then1: |
| ; CHECK: call i32 @testSetjmp |
| |
| lpad: ; preds = %entry |
| %0 = landingpad { i8*, i32 } |
| catch i8* null |
| %1 = extractvalue { i8*, i32 } %0, 0 |
| %2 = extractvalue { i8*, i32 } %0, 1 |
| %3 = call i8* @__cxa_begin_catch(i8* %1) #2 |
| call void @__cxa_end_catch() |
| br label %try.cont |
| |
| try.cont: ; preds = %lpad, %entry |
| ret void |
| } |
| |
| ; @foo can either throw an exception or longjmp. Because this function doesn't |
| ; have any setjmp calls, we only handle exceptions in this function. But because |
| ; sjlj is enabled, we check if the thrown value is longjmp and if so rethrow it |
| ; by calling @emscripten_longjmp. |
| define void @rethrow_longjmp() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) { |
| ; CHECK-LABEL: @rethrow_longjmp |
| entry: |
| invoke void @foo() |
| to label %try.cont unwind label %lpad |
| ; CHECK: entry: |
| ; CHECK: %cmp.eq.one = icmp eq i32 %__THREW__.val, 1 |
| ; CHECK-NEXT: %cmp.eq.zero = icmp eq i32 %__THREW__.val, 0 |
| ; CHECK-NEXT: %or = or i1 %cmp.eq.zero, %cmp.eq.one |
| ; CHECK-NEXT: br i1 %or, label %tail, label %rethrow.longjmp |
| |
| ; CHECK: try.cont: |
| ; CHECK-NEXT: %phi = phi i32 [ undef, %tail ], [ undef, %lpad ] |
| ; CHECK-NEXT: ret void |
| |
| ; CHECK: rethrow.longjmp: |
| ; CHECK-NEXT: %threw.phi = phi i32 [ %__THREW__.val, %entry ] |
| ; CHECK-NEXT: %__threwValue.val = load i32, i32* @__threwValue, align 4 |
| ; CHECK-NEXT: call void @emscripten_longjmp(i32 %threw.phi, i32 %__threwValue.val |
| ; CHECK-NEXT: unreachable |
| |
| ; CHECK: tail: |
| ; CHECK-NEXT: %cmp = icmp eq i32 %__THREW__.val, 1 |
| ; CHECK-NEXT: br i1 %cmp, label %lpad, label %try.cont |
| |
| lpad: ; preds = %entry |
| %0 = landingpad { i8*, i32 } |
| catch i8* null |
| %1 = extractvalue { i8*, i32 } %0, 0 |
| %2 = extractvalue { i8*, i32 } %0, 1 |
| %3 = call i8* @__cxa_begin_catch(i8* %1) #5 |
| call void @__cxa_end_catch() |
| br label %try.cont |
| |
| try.cont: ; preds = %lpad, %entry |
| %phi = phi i32 [ undef, %entry ], [ undef, %lpad ] |
| ret void |
| } |
| |
| ; This function contains a setjmp call and no invoke, so we only handle longjmp |
| ; here. But @foo can also throw an exception, so we check if an exception is |
| ; thrown and if so rethrow it by calling @__resumeException. Also we have to |
| ; free the setjmpTable buffer before calling @__resumeException. |
| define void @rethrow_exception() { |
| ; CHECK-LABEL: @rethrow_exception |
| entry: |
| %buf = alloca [1 x %struct.__jmp_buf_tag], align 16 |
| %arraydecay = getelementptr inbounds [1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* %buf, i32 0, i32 0 |
| %call = call i32 @setjmp(%struct.__jmp_buf_tag* %arraydecay) #0 |
| %cmp = icmp ne i32 %call, 0 |
| br i1 %cmp, label %return, label %if.end |
| |
| if.end: ; preds = %entry |
| call void @foo() |
| br label %return |
| |
| ; CHECK: if.end: |
| ; CHECK: %cmp.eq.one = icmp eq i32 %__THREW__.val, 1 |
| ; CHECK-NEXT: br i1 %cmp.eq.one, label %rethrow.exn, label %normal |
| |
| ; CHECK: rethrow.exn: |
| ; CHECK-NEXT: %exn = call i8* @__cxa_find_matching_catch_2() |
| ; CHECK-NEXT: %[[BUF:.*]] = bitcast i32* %setjmpTable{{.*}} to i8* |
| ; CHECK-NEXT: call void @free(i8* %[[BUF]]) |
| ; CHECK-NEXT: call void @__resumeException(i8* %exn) |
| ; CHECK-NEXT: unreachable |
| |
| ; CHECK: normal: |
| ; CHECK-NEXT: icmp ne i32 %__THREW__.val, 0 |
| |
| return: ; preds = %if.end, %entry |
| ret void |
| } |
| |
| ; The same as 'rethrow_exception' but contains a __cxa_throw call. We have to |
| ; free the setjmpTable buffer before calling __cxa_throw. |
| define void @rethrow_exception2() { |
| ; CHECK-LABEL: @rethrow_exception2 |
| entry: |
| %buf = alloca [1 x %struct.__jmp_buf_tag], align 16 |
| %arraydecay = getelementptr inbounds [1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* %buf, i32 0, i32 0 |
| %call = call i32 @setjmp(%struct.__jmp_buf_tag* %arraydecay) #0 |
| %cmp = icmp ne i32 %call, 0 |
| br i1 %cmp, label %throw, label %if.end |
| |
| if.end: ; preds = %entry |
| call void @foo() |
| br label %throw |
| |
| throw: ; preds = %if.end, %entry |
| call void @__cxa_throw(i8* null, i8* null, i8* null) #1 |
| unreachable |
| |
| ; CHECK: throw: |
| ; CHECK: %[[BUF:.*]] = bitcast i32* %setjmpTable{{.*}} to i8* |
| ; CHECK-NEXT: call void @free(i8* %[[BUF]]) |
| ; CHECK-NEXT: call void @__cxa_throw(i8* null, i8* null, i8* null) |
| ; CHECK-NEXT: unreachable |
| } |
| |
| ; The same case with @rethrow_longjmp, but there are multiple function calls |
| ; that can possibly longjmp (instead of throwing exception) so we have to |
| ; rethrow them. Here we test if we correclty generate only one 'rethrow.longjmp' |
| ; BB and share it for multiple calls. |
| define void @rethrow_longjmp_multi() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) { |
| ; CHECK-LABEL: @rethrow_longjmp_multi |
| entry: |
| invoke void @foo() |
| to label %bb unwind label %lpad |
| |
| bb: ; preds = %entry |
| invoke void @foo() |
| to label %try.cont unwind label %lpad |
| |
| lpad: ; preds = %bb, %entry |
| %0 = landingpad { i8*, i32 } |
| catch i8* null |
| %1 = extractvalue { i8*, i32 } %0, 0 |
| %2 = extractvalue { i8*, i32 } %0, 1 |
| %3 = call i8* @__cxa_begin_catch(i8* %1) #5 |
| call void @__cxa_end_catch() |
| br label %try.cont |
| |
| try.cont: ; preds = %lpad, %bb |
| %phi = phi i32 [ undef, %bb ], [ undef, %lpad ] |
| ret void |
| |
| ; CHECK: rethrow.longjmp: |
| ; CHECK-NEXT: %threw.phi = phi i32 [ %__THREW__.val, %entry ], [ %__THREW__.val1, %bb ] |
| ; CHECK-NEXT: %__threwValue.val = load i32, i32* @__threwValue, align 4 |
| ; CHECK-NEXT: call void @emscripten_longjmp(i32 %threw.phi, i32 %__threwValue.val) |
| ; CHECK-NEXT: unreachable |
| } |
| |
| ; The same case with @rethrow_exception, but there are multiple function calls |
| ; that can possibly throw (instead of longjmping) so we have to rethrow them. |
| ; Here we test if correctly we generate only one 'rethrow.exn' BB and share it |
| ; for multiple calls. |
| define void @rethrow_exception_multi() { |
| ; CHECK-LABEL: @rethrow_exception_multi |
| entry: |
| %buf = alloca [1 x %struct.__jmp_buf_tag], align 16 |
| %arraydecay = getelementptr inbounds [1 x %struct.__jmp_buf_tag], [1 x %struct.__jmp_buf_tag]* %buf, i32 0, i32 0 |
| %call = call i32 @setjmp(%struct.__jmp_buf_tag* %arraydecay) #0 |
| %cmp = icmp ne i32 %call, 0 |
| br i1 %cmp, label %return, label %if.end |
| |
| if.end: ; preds = %entry |
| call void @foo() |
| call void @foo() |
| br label %return |
| |
| return: ; preds = %entry, %if.end |
| ret void |
| |
| ; CHECK: rethrow.exn: |
| ; CHECK-NEXT: %setjmpTable{{.*}} = phi i32* [ %setjmpTable{{.*}}, %if.end.split ], [ %setjmpTable{{.*}}, %if.end ] |
| ; CHECK-NEXT: %exn = call i8* @__cxa_find_matching_catch_2() |
| ; CHECK-NEXT: %{{.*}} = bitcast i32* %setjmpTable{{.*}} to i8* |
| ; CHECK-NEXT: tail call void @free(i8* %{{.*}}) |
| ; CHECK-NEXT: call void @__resumeException(i8* %exn) |
| ; CHECK-NEXT: unreachable |
| } |
| |
| declare void @foo() |
| ; Function Attrs: returns_twice |
| declare i32 @setjmp(%struct.__jmp_buf_tag*) |
| ; Function Attrs: noreturn |
| declare void @longjmp(%struct.__jmp_buf_tag*, i32) |
| declare i32 @__gxx_personality_v0(...) |
| declare i8* @__cxa_begin_catch(i8*) |
| declare void @__cxa_end_catch() |
| declare void @__cxa_throw(i8*, i8*, i8*) |
| |
| attributes #0 = { returns_twice } |
| attributes #1 = { noreturn } |