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|
; RUN: opt < %s -wasm-lower-em-ehsjlj -wasm-enable-eh -wasm-enable-sjlj -S | FileCheck %s
; RUN: llc < %s -wasm-enable-eh -wasm-enable-sjlj -exception-model=wasm -mattr=+exception-handling -verify-machineinstrs
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] }
%struct.Temp = type { i8 }
@_ZL3buf = internal global [1 x %struct.__jmp_buf_tag] zeroinitializer, align 16
; void test() {
; int jmpval = setjmp(buf);
; if (jmpval != 0)
; return;
; try {
; foo();
; } catch (...) {
; }
; }
define void @setjmp_and_try() personality ptr @__gxx_wasm_personality_v0 {
; CHECK-LABEL: @setjmp_and_try
entry:
%call = call i32 @setjmp(ptr @_ZL3buf) #0
%cmp = icmp ne i32 %call, 0
br i1 %cmp, label %return, label %if.end
if.end: ; preds = %entry
invoke void @foo()
to label %return unwind label %catch.dispatch
catch.dispatch: ; preds = %if.end
%0 = catchswitch within none [label %catch.start] unwind to caller
; CHECK: catch.dispatch:
; CHECK-NEXT: catchswitch within none [label %catch.start] unwind label %catch.dispatch.longjmp
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call ptr @__cxa_begin_catch(ptr %2) #2 [ "funclet"(token %1) ]
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %return
; CHECK: catch.start:
; CHECK: [[T0:%.*]] = catchpad within {{.*}} [ptr null]
; CHECK: invoke void @__cxa_end_catch() [ "funclet"(token [[T0]]) ]
; CHECK-NEXT: to label %.noexc unwind label %catch.dispatch.longjmp
; CHECK: .noexc:
; CHECK-NEXT: catchret from [[T0]] to label {{.*}}
return: ; preds = %catch.start, %if.end, %entry
ret void
; CHECK: catch.dispatch.longjmp:
; CHECK-NEXT: catchswitch within none [label %catch.longjmp] unwind to caller
}
; void setjmp_within_try() {
; try {
; foo();
; int jmpval = setjmp(buf);
; if (jmpval != 0)
; return;
; foo();
; } catch (...) {
; }
; }
define void @setjmp_within_try() personality ptr @__gxx_wasm_personality_v0 {
; CHECK-LABEL: @setjmp_within_try
entry:
%jmpval = alloca i32, align 4
%exn.slot = alloca ptr, align 4
invoke void @foo()
to label %invoke.cont unwind label %catch.dispatch
invoke.cont: ; preds = %entry
%call = invoke i32 @setjmp(ptr @_ZL3buf) #0
to label %invoke.cont1 unwind label %catch.dispatch
invoke.cont1: ; preds = %invoke.cont
store i32 %call, ptr %jmpval, align 4
%0 = load i32, ptr %jmpval, align 4
%cmp = icmp ne i32 %0, 0
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %invoke.cont1
br label %try.cont
if.end: ; preds = %invoke.cont1
invoke void @foo()
to label %invoke.cont2 unwind label %catch.dispatch
catch.dispatch: ; preds = %if.end, %invoke.cont, %entry
%1 = catchswitch within none [label %catch.start] unwind to caller
; CHECK: catch.dispatch:
; CHECK: catchswitch within none [label %catch.start] unwind label %catch.dispatch.longjmp
catch.start: ; preds = %catch.dispatch
%2 = catchpad within %1 [ptr null]
%3 = call ptr @llvm.wasm.get.exception(token %2)
store ptr %3, ptr %exn.slot, align 4
%4 = call i32 @llvm.wasm.get.ehselector(token %2)
br label %catch
catch: ; preds = %catch.start
%exn = load ptr, ptr %exn.slot, align 4
%5 = call ptr @__cxa_begin_catch(ptr %exn) #2 [ "funclet"(token %2) ]
call void @__cxa_end_catch() [ "funclet"(token %2) ]
catchret from %2 to label %catchret.dest
; CHECK: catch: ; preds = %catch.start
; CHECK-NEXT: %exn = load ptr, ptr %exn.slot6, align 4
; CHECK-NEXT: %5 = call ptr @__cxa_begin_catch(ptr %exn) #6 [ "funclet"(token %2) ]
; CHECK-NEXT: invoke void @__cxa_end_catch() [ "funclet"(token %2) ]
; CHECK-NEXT: to label %.noexc unwind label %catch.dispatch.longjmp
catchret.dest: ; preds = %catch
br label %try.cont
try.cont: ; preds = %invoke.cont2, %catchret.dest, %if.then
ret void
invoke.cont2: ; preds = %if.end
br label %try.cont
; CHECK: catch.dispatch.longjmp:
; CHECK-NEXT: catchswitch within none [label %catch.longjmp] unwind to caller
}
; void setjmp_and_nested_try() {
; int jmpval = setjmp(buf);
; if (jmpval != 0)
; return;
; try {
; foo();
; try {
; foo();
; } catch (...) {
; foo();
; }
; } catch (...) {
; }
; }
define void @setjmp_and_nested_try() personality ptr @__gxx_wasm_personality_v0 {
; CHECK-LABEL: @setjmp_and_nested_try
entry:
%call = call i32 @setjmp(ptr @_ZL3buf) #0
%cmp = icmp ne i32 %call, 0
br i1 %cmp, label %try.cont10, label %if.end
if.end: ; preds = %entry
invoke void @foo()
to label %invoke.cont unwind label %catch.dispatch5
invoke.cont: ; preds = %if.end
invoke void @foo()
to label %try.cont10 unwind label %catch.dispatch
catch.dispatch: ; preds = %invoke.cont
%0 = catchswitch within none [label %catch.start] unwind label %catch.dispatch5
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call ptr @__cxa_begin_catch(ptr %2) #2 [ "funclet"(token %1) ]
invoke void @foo() [ "funclet"(token %1) ]
to label %invoke.cont2 unwind label %ehcleanup
invoke.cont2: ; preds = %catch.start
invoke void @__cxa_end_catch() [ "funclet"(token %1) ]
to label %invoke.cont3 unwind label %catch.dispatch5
invoke.cont3: ; preds = %invoke.cont2
catchret from %1 to label %try.cont10
ehcleanup: ; preds = %catch.start
%5 = cleanuppad within %1 []
invoke void @__cxa_end_catch() [ "funclet"(token %5) ]
to label %invoke.cont4 unwind label %terminate
; CHECK: ehcleanup:
; CHECK-NEXT: [[T0:%.*]] = cleanuppad within {{.*}} []
; CHECK-NEXT: invoke void @__cxa_end_catch() [ "funclet"(token [[T0]]) ]
; CHECK-NEXT: to label %invoke.cont4 unwind label %terminate
invoke.cont4: ; preds = %ehcleanup
cleanupret from %5 unwind label %catch.dispatch5
; CHECK: invoke.cont4:
; CHECK-NEXT: cleanupret from [[T0]] unwind label %catch.dispatch5
catch.dispatch5: ; preds = %invoke.cont4, %invoke.cont2, %catch.dispatch, %if.end
%6 = catchswitch within none [label %catch.start6] unwind to caller
; CHECK: catch.dispatch5:
; CHECK-NEXT: catchswitch within none [label %catch.start6] unwind label %catch.dispatch.longjmp
catch.start6: ; preds = %catch.dispatch5
%7 = catchpad within %6 [ptr null]
%8 = call ptr @llvm.wasm.get.exception(token %7)
%9 = call i32 @llvm.wasm.get.ehselector(token %7)
%10 = call ptr @__cxa_begin_catch(ptr %8) #2 [ "funclet"(token %7) ]
call void @__cxa_end_catch() [ "funclet"(token %7) ]
catchret from %7 to label %try.cont10
; CHECK: catch.start6:
; CHECK-NEXT: [[T1:%.*]] = catchpad within {{.*}} [ptr null]
; CHECK-NEXT: call ptr @llvm.wasm.get.exception(token [[T1]])
; CHECK-NEXT: call i32 @llvm.wasm.get.ehselector(token [[T1]])
; CHECK-NEXT: call ptr @__cxa_begin_catch(ptr {{.*}}) {{.*}} [ "funclet"(token [[T1]]) ]
; CHECK: invoke void @__cxa_end_catch() [ "funclet"(token [[T1]]) ]
; CHECK-NEXT: to label %.noexc unwind label %catch.dispatch.longjmp
; CHECK: .noexc:
; CHECK-NEXT: catchret from [[T1]] to label {{.*}}
try.cont10: ; preds = %catch.start6, %invoke.cont3, %invoke.cont, %entry
ret void
terminate: ; preds = %ehcleanup
%11 = cleanuppad within %5 []
call void @terminate() #3 [ "funclet"(token %11) ]
unreachable
; CHECK: terminate:
; CHECK-NEXT: [[T2:%.*]] = cleanuppad within [[T0]] []
; Note that this call unwinds not to %catch.dispatch.longjmp but to
; %catch.dispatch5. This call is enclosed in the cleanuppad above, but there is
; no matching catchret, which has the unwind destination. So this checks this
; cleanuppad's parent, which is in 'ehcleanup', and unwinds to its unwind
; destination, %catch.dispatch5.
; This call was originally '_ZSt9terminatev', which is the mangled name for
; 'std::terminate'. But we listed that as "cannot longjmp", we changed
; the name of the function in this test to show the case in which a call has to
; change to an invoke whose unwind destination is determined by its parent
; chain.
; CHECK-NEXT: invoke void @terminate() {{.*}} [ "funclet"(token [[T2]]) ]
; CHECK-NEXT: to label %[[NOEXC:.*]] unwind label %catch.dispatch5
; CHECK: [[NOEXC]]:
; CHECK-NEXT: unreachable
; CHECK: catch.dispatch.longjmp:
; CHECK-NEXT: catchswitch within none [label %catch.longjmp] unwind to caller
}
; void @cleanuppad_no_parent {
; jmp_buf buf;
; Temp t;
; setjmp(buf);
; }
define void @cleanuppad_no_parent() personality ptr @__gxx_wasm_personality_v0 {
; CHECK-LABEL: @cleanuppad_no_parent
entry:
%buf = alloca [1 x %struct.__jmp_buf_tag], align 16
%t = alloca %struct.Temp, align 1
%call = invoke i32 @setjmp(ptr noundef %buf) #0
to label %invoke.cont unwind label %ehcleanup
invoke.cont: ; preds = %entry
%call1 = call noundef ptr @_ZN4TempD2Ev(ptr noundef %t) #2
ret void
ehcleanup: ; preds = %entry
%0 = cleanuppad within none []
; After SjLj transformation, this will be converted to an invoke that
; eventually unwinds to %catch.dispatch.longjmp. But in case a call has a
; "funclet" attribute, we should unwind to the funclet's unwind destination
; first to preserve the scoping structure. But this call's parent is %0
; (cleanuppad), whose parent is 'none', so we should unwind directly to
; %catch.dispatch.longjmp.
%call2 = call noundef ptr @_ZN4TempD2Ev(ptr noundef %t) #2 [ "funclet"(token %0) ]
; CHECK: %call11 = invoke {{.*}} ptr @_ZN4TempD2Ev(ptr
; CHECK-NEXT: to label {{.*}} unwind label %catch.dispatch.longjmp
cleanupret from %0 unwind to caller
}
; This case was adapted from @cleanuppad_no_parent by removing allocas and
; destructor calls, to generate a situation that there's only 'invoke @setjmp'
; and no other longjmpable calls.
define i32 @setjmp_only() personality ptr @__gxx_wasm_personality_v0 {
; CHECK-LABEL: @setjmp_only
entry:
%buf = alloca [1 x %struct.__jmp_buf_tag], align 16
%call = invoke i32 @setjmp(ptr noundef %buf) #0
to label %invoke.cont unwind label %ehcleanup
invoke.cont: ; preds = %entry
ret i32 %call
; CHECK: invoke.cont:
; The remaining setjmp call is converted to constant 0, because setjmp returns 0
; when called directly.
; CHECK: ret i32 0
ehcleanup: ; preds = %entry
%0 = cleanuppad within none []
cleanupret from %0 unwind to caller
}
declare void @foo()
; Function Attrs: nounwind
declare ptr @_ZN4TempD2Ev(ptr %this) #2
; Function Attrs: returns_twice
declare i32 @setjmp(ptr) #0
; Function Attrs: noreturn
declare void @longjmp(ptr, i32) #1
declare i32 @__gxx_wasm_personality_v0(...)
; Function Attrs: nounwind
declare ptr @llvm.wasm.get.exception(token) #2
; Function Attrs: nounwind
declare i32 @llvm.wasm.get.ehselector(token) #2
declare ptr @__cxa_begin_catch(ptr)
declare void @__cxa_end_catch()
declare void @terminate()
attributes #0 = { returns_twice }
attributes #1 = { noreturn }
attributes #2 = { nounwind }
attributes #3 = { noreturn nounwind }
|
