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|
; RUN: llc < %s -asm-verbose=false -wasm-enable-eh -wasm-use-legacy-eh=false -exception-model=wasm -mattr=+exception-handling -verify-machineinstrs | FileCheck --implicit-check-not=ehgcr -allow-deprecated-dag-overlap %s
; RUN: llc < %s -asm-verbose=false -wasm-enable-eh -wasm-use-legacy-eh=false -exception-model=wasm -mattr=+exception-handling -verify-machineinstrs -O0
; RUN: llc < %s -wasm-enable-eh -wasm-use-legacy-eh=false -exception-model=wasm -mattr=+exception-handling
; RUN: llc < %s -wasm-enable-eh -wasm-use-legacy-eh=false -exception-model=wasm -mattr=+exception-handling -filetype=obj
; RUN: llc < %s -mtriple=wasm64-unknown-unknown -wasm-enable-eh -wasm-use-legacy-eh=false -exception-model=wasm -mattr=+exception-handling -verify-machineinstrs | FileCheck --implicit-check-not=ehgcr -allow-deprecated-dag-overlap %s --check-prefix=WASM64
target triple = "wasm32-unknown-unknown"
%struct.Temp = type { i8 }
@_ZTIi = external dso_local constant ptr
; CHECK: .tagtype __cpp_exception i32
; CHECK-LABEL: throw:
; CHECK: throw __cpp_exception
; CHECK-NOT: unreachable
define void @throw(ptr %p) {
call void @llvm.wasm.throw(i32 0, ptr %p)
ret void
}
; Simple test with a try-catch
;
; void foo();
; void catch() {
; try {
; foo();
; } catch (int) {
; }
; }
; CHECK-LABEL: catch:
; WASM64-LABEL: catch:
; CHECK: global.get __stack_pointer
; CHECK: local.set 0
; CHECK: block
; CHECK: block () -> (i32, exnref)
; CHECK: try_table (catch_ref __cpp_exception 0)
; WASM64: block () -> (i64, exnref)
; CHECK: call foo
; CHECK: br 2
; CHECK: end_try_table
; CHECK: unreachable
; CHECK: end_block
; CHECK: local.set 2
; CHECK: local.get 0
; CHECK: global.set __stack_pointer
; CHECK: i32.store __wasm_lpad_context
; CHECK: call _Unwind_CallPersonality
; CHECK: block
; CHECK: br_if 0
; CHECK: call __cxa_begin_catch
; CHECK: call __cxa_end_catch
; CHECK: br 1
; CHECK: end_block
; CHECK: local.get 2
; CHECK: throw_ref
; CHECK: end_block
define void @catch() personality ptr @__gxx_wasm_personality_v0 {
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 [ptr @_ZTIi]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi)
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch, label %rethrow
catch: ; preds = %catch.start
%5 = call ptr @__cxa_begin_catch(ptr %2) [ "funclet"(token %1) ]
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
rethrow: ; preds = %catch.start
call void @llvm.wasm.rethrow() [ "funclet"(token %1) ]
unreachable
try.cont: ; preds = %catch, %entry
ret void
}
; Destructor (cleanup) test
;
; void foo();
; struct Temp {
; ~Temp() {}
; };
; void cleanup() {
; Temp t;
; foo();
; }
; CHECK-LABEL: cleanup:
; CHECK: block
; CHECK: block exnref
; CHECK: try_table (catch_all_ref 0)
; CHECK: call foo
; CHECK: br 2
; CHECK: end_try_table
; CHECK: end_block
; CHECK: local.set 1
; CHECK: global.set __stack_pointer
; CHECK: call _ZN4TempD2Ev
; CHECK: local.get 1
; CHECK: throw_ref
; CHECK: end_block
; CHECK: call _ZN4TempD2Ev
define void @cleanup() personality ptr @__gxx_wasm_personality_v0 {
entry:
%t = alloca %struct.Temp, align 1
invoke void @foo()
to label %invoke.cont unwind label %ehcleanup
invoke.cont: ; preds = %entry
%call = call ptr @_ZN4TempD2Ev(ptr %t)
ret void
ehcleanup: ; preds = %entry
%0 = cleanuppad within none []
%call1 = call ptr @_ZN4TempD2Ev(ptr %t) [ "funclet"(token %0) ]
cleanupret from %0 unwind to caller
}
; Calling a function that may throw within a 'catch (...)' generates a
; terminatepad, because __cxa_end_catch() also can throw within 'catch (...)'.
;
; void foo();
; void terminatepad() {
; try {
; foo();
; } catch (...) {
; foo();
; }
; }
; CHECK-LABEL: terminatepad
; WASM64-LABEL: terminatepad
; CHECK: block
; CHECK: block i32
; WASM64: block i64
; CHECK: try_table (catch __cpp_exception 0)
; CHECK: call foo
; CHECK: br 2
; CHECK: end_try_table
; CHECK: end_block
; CHECK: call __cxa_begin_catch
; CHECK: block
; CHECK: block exnref
; CHECK: try_table (catch_all_ref 0)
; CHECK: call foo
; CHECK: br 2
; CHECK: end_try_table
; CHECK: end_block
; CHECK: local.set 2
; CHECK: block
; CHECK: block
; CHECK: try_table (catch_all 0)
; CHECK: call __cxa_end_catch
; CHECK: br 2
; CHECK: end_try_table
; CHECK: end_block
; CHECK: call _ZSt9terminatev
; CHECK: unreachable
; CHECK: end_block
; CHECK: local.get 2
; CHECK: throw_ref
; CHECK: end_block
; CHECK: call __cxa_end_catch
; CHECK: end_block
define void @terminatepad() personality ptr @__gxx_wasm_personality_v0 {
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 [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) [ "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 = %invoke.cont1, %entry
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 []
call void @_ZSt9terminatev() #2 [ "funclet"(token %6) ]
unreachable
}
; Tests prologues and epilogues are not generated within EH scopes.
; They should not be treated as funclets; BBs starting with a catch instruction
; should not have a prologue, and BBs ending with a catchret/cleanupret should
; not have an epilogue. This is separate from __stack_pointer restoring
; instructions after a catch instruction.
;
; void bar(int) noexcept;
; void no_prolog_epilog_in_ehpad() {
; int stack_var = 0;
; bar(stack_var);
; try {
; foo();
; } catch (int) {
; foo();
; }
; }
; CHECK-LABEL: no_prolog_epilog_in_ehpad
; CHECK: call bar
; CHECK: block
; CHECK: block () -> (i32, exnref)
; CHECK: try_table (catch_ref __cpp_exception 0)
; CHECK: call foo
; CHECK: br 2
; CHECK: end_try_table
; CHECK: end_block
; CHECK: local.set 2
; CHECK-NOT: global.get __stack_pointer
; CHECK: global.set __stack_pointer
; CHECK: block
; CHECK: block
; CHECK: br_if 0
; CHECK: call __cxa_begin_catch
; CHECK: block exnref
; CHECK: try_table (catch_all_ref 0)
; CHECK: call foo
; CHECK: br 3
; CHECK: end_try_table
; CHECK: end_block
; CHECK: local.set 2
; CHECK-NOT: global.get __stack_pointer
; CHECK: global.set __stack_pointer
; CHECK: call __cxa_end_catch
; CHECK: local.get 2
; CHECK: throw_ref
; CHECK-NOT: global.set __stack_pointer
; CHECK: end_block
; CHECK: local.get 2
; CHECK: throw_ref
; CHECK: end_block
; CHECK-NOT: global.set __stack_pointer
; CHECK: call __cxa_end_catch
; CHECK: end_block
define void @no_prolog_epilog_in_ehpad() personality ptr @__gxx_wasm_personality_v0 {
entry:
%stack_var = alloca i32, align 4
call void @bar(ptr %stack_var)
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 [ptr @_ZTIi]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for(ptr @_ZTIi)
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch, label %rethrow
catch: ; preds = %catch.start
%5 = call ptr @__cxa_begin_catch(ptr %2) [ "funclet"(token %1) ]
%6 = load float, ptr %5, align 4
invoke void @foo() [ "funclet"(token %1) ]
to label %invoke.cont1 unwind label %ehcleanup
invoke.cont1: ; preds = %catch
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
rethrow: ; preds = %catch.start
call void @llvm.wasm.rethrow() [ "funclet"(token %1) ]
unreachable
try.cont: ; preds = %invoke.cont1, %entry
ret void
ehcleanup: ; preds = %catch
%7 = cleanuppad within %1 []
call void @__cxa_end_catch() [ "funclet"(token %7) ]
cleanupret from %7 unwind to caller
}
; When a function does not have stack-allocated objects, it does not need to
; store SP back to __stack_pointer global at the epilog.
;
; void foo();
; void no_sp_writeback() {
; try {
; foo();
; } catch (...) {
; }
; }
; CHECK-LABEL: no_sp_writeback
; CHECK: block
; CHECK: block i32
; CHECK: try_table (catch __cpp_exception 0)
; CHECK: call foo
; CHECK: br 2
; CHECK: end_try_table
; CHECK: end_block
; CHECK: call __cxa_begin_catch
; CHECK: call __cxa_end_catch
; CHECK: end_block
; CHECK-NOT: global.set __stack_pointer
; CHECK: end_function
define void @no_sp_writeback() personality ptr @__gxx_wasm_personality_v0 {
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 [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) [ "funclet"(token %1) ]
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
try.cont: ; preds = %catch.start, %entry
ret void
}
; When the result of @llvm.wasm.get.exception is not used. This is created to
; fix a bug in LateEHPrepare and this should not crash.
define void @get_exception_wo_use() personality ptr @__gxx_wasm_personality_v0 {
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 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
catchret from %1 to label %try.cont
try.cont: ; preds = %catch.start, %entry
ret void
}
; Tests a case when a cleanup region (cleanuppad ~ clanupret) contains another
; catchpad
define void @complex_cleanup_region() personality ptr @__gxx_wasm_personality_v0 {
entry:
invoke void @foo()
to label %invoke.cont unwind label %ehcleanup
invoke.cont: ; preds = %entry
ret void
ehcleanup: ; preds = %entry
%0 = cleanuppad within none []
invoke void @foo() [ "funclet"(token %0) ]
to label %ehcleanupret unwind label %catch.dispatch
catch.dispatch: ; preds = %ehcleanup
%1 = catchswitch within %0 [label %catch.start] unwind label %ehcleanup.1
catch.start: ; preds = %catch.dispatch
%2 = catchpad within %1 [ptr null]
%3 = call ptr @llvm.wasm.get.exception(token %2)
%4 = call i32 @llvm.wasm.get.ehselector(token %2)
catchret from %2 to label %ehcleanupret
ehcleanup.1: ; preds = %catch.dispatch
%5 = cleanuppad within %0 []
unreachable
ehcleanupret: ; preds = %catch.start, %ehcleanup
cleanupret from %0 unwind to caller
}
; Regression test for the bug that 'rethrow' was not treated correctly as a
; terminator in isel.
define void @rethrow_terminator() personality ptr @__gxx_wasm_personality_v0 {
entry:
invoke void @foo()
to label %try.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind label %ehcleanup
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [ptr @_ZTIi]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call i32 @llvm.wasm.get.ehselector(token %1)
%4 = call i32 @llvm.eh.typeid.for.p0(ptr @_ZTIi)
%matches = icmp eq i32 %3, %4
br i1 %matches, label %catch, label %rethrow
catch: ; preds = %catch.start
%5 = call ptr @__cxa_begin_catch(ptr %2) [ "funclet"(token %1) ]
%6 = load i32, ptr %5, align 4
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
rethrow: ; preds = %catch.start
invoke void @llvm.wasm.rethrow() #1 [ "funclet"(token %1) ]
to label %unreachable unwind label %ehcleanup
try.cont: ; preds = %entry, %catch
ret void
ehcleanup: ; preds = %rethrow, %catch.dispatch
; 'rethrow' BB is this BB's predecessor, and its
; 'invoke void @llvm.wasm.rethrow()' is lowered down to a 'RETHROW' in Wasm
; MIR. And this 'phi' creates 'CONST_I32' instruction in the predecessor
; 'rethrow' BB. If 'RETHROW' is not treated correctly as a terminator, it can
; create a BB like
; bb.3.rethrow:
; RETHROW 0
; %0 = CONST_I32 20
; BR ...
%tmp = phi i32 [ 10, %catch.dispatch ], [ 20, %rethrow ]
%7 = cleanuppad within none []
call void @take_i32(i32 %tmp) [ "funclet"(token %7) ]
cleanupret from %7 unwind to caller
unreachable: ; preds = %rethrow
unreachable
}
; The bitcode below is generated when the code below is compiled and
; Temp::~Temp() is inlined into inlined_cleanupret():
;
; void inlined_cleanupret() {
; try {
; Temp t;
; throw 2;
; } catch (...)
; }
;
; Temp::~Temp() {
; try {
; throw 1;
; } catch (...) {
; }
; }
;
; ~Temp() generates cleanupret, which is lowered to a 'throw_ref' later. That
; throw_ref's argument should correctly target the top-level cleanuppad
; (catch_all_ref). This is a regression test for the bug where we did not
; compute throw_ref's argument correctly.
; CHECK-LABEL: inlined_cleanupret:
; CHECK: block exnref
; CHECK: block
; CHECK: block exnref
; CHECK: try_table (catch_all_ref 0)
; CHECK: call __cxa_throw
; CHECK: end_try_table
; CHECK: end_block
; try_table (catch_all_ref 0)'s caught exception is stored in local 2
; CHECK: local.set 2
; CHECK: block
; CHECK: try_table (catch_all 0)
; CHECK: block
; CHECK: block i32
; CHECK: try_table (catch __cpp_exception 0)
; CHECK: call __cxa_throw
; CHECK: end_try_table
; CHECK: end_block
; CHECK: call __cxa_end_catch
; CHECK: block i32
; CHECK: try_table (catch_all_ref 5)
; CHECK: try_table (catch __cpp_exception 1)
; Note that the throw_ref below targets the top-level catch_all_ref (local 2)
; CHECK: local.get 2
; CHECK: throw_ref
; CHECK: end_try_table
; CHECK: end_try_table
; CHECK: end_block
; CHECK: try_table (catch_all_ref 4)
; CHECK: call __cxa_end_catch
; CHECK: end_try_table
; CHECK: return
; CHECK: end_block
; CHECK: end_try_table
; CHECK: end_block
; CHECK: call _ZSt9terminatev
; CHECK: end_block
; CHECK: end_block
; CHECK: throw_ref
define void @inlined_cleanupret() personality ptr @__gxx_wasm_personality_v0 {
entry:
%exception = tail call ptr @__cxa_allocate_exception(i32 4)
store i32 2, ptr %exception, align 16
invoke void @__cxa_throw(ptr nonnull %exception, ptr nonnull @_ZTIi, ptr null)
to label %unreachable unwind label %ehcleanup
ehcleanup: ; preds = %entry
%0 = cleanuppad within none []
%exception.i = call ptr @__cxa_allocate_exception(i32 4) [ "funclet"(token %0) ]
store i32 1, ptr %exception.i, align 16
invoke void @__cxa_throw(ptr nonnull %exception.i, ptr nonnull @_ZTIi, ptr null) [ "funclet"(token %0) ]
to label %unreachable unwind label %catch.dispatch.i
catch.dispatch.i: ; preds = %ehcleanup
%1 = catchswitch within %0 [label %catch.start.i] unwind label %terminate.i
catch.start.i: ; preds = %catch.dispatch.i
%2 = catchpad within %1 [ptr null]
%3 = tail call ptr @llvm.wasm.get.exception(token %2)
%4 = tail call i32 @llvm.wasm.get.ehselector(token %2)
%5 = call ptr @__cxa_begin_catch(ptr %3) [ "funclet"(token %2) ]
invoke void @__cxa_end_catch() [ "funclet"(token %2) ]
to label %invoke.cont.i unwind label %terminate.i
invoke.cont.i: ; preds = %catch.start.i
catchret from %2 to label %_ZN4TempD2Ev.exit
terminate.i: ; preds = %catch.start.i, %catch.dispatch.i
%6 = cleanuppad within %0 []
call void @_ZSt9terminatev() #2 [ "funclet"(token %6) ]
unreachable
_ZN4TempD2Ev.exit: ; preds = %invoke.cont.i
cleanupret from %0 unwind label %catch.dispatch
catch.dispatch: ; preds = %_ZN4TempD2Ev.exit
%7 = catchswitch within none [label %catch.start] unwind to caller
catch.start: ; preds = %catch.dispatch
%8 = catchpad within %7 [ptr null]
%9 = tail call ptr @llvm.wasm.get.exception(token %8)
%10 = tail call i32 @llvm.wasm.get.ehselector(token %8)
%11 = call ptr @__cxa_begin_catch(ptr %9) #8 [ "funclet"(token %8) ]
call void @__cxa_end_catch() [ "funclet"(token %8) ]
catchret from %8 to label %try.cont
try.cont: ; preds = %catch.start
ret void
unreachable: ; preds = %entry
unreachable
}
; This tests whether llvm.wasm.throw intrinsic can invoked and iseled correctly.
; CHECK-LABEL: invoke_throw:
; CHECK: try_table (catch __cpp_exception 0)
; CHECK: local.get 0
; CHECK: throw __cpp_exception
; CHECK: end_try_table
define void @invoke_throw(ptr %p) personality ptr @__gxx_wasm_personality_v0 {
entry:
invoke void @llvm.wasm.throw(i32 0, ptr %p)
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 [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) #4 [ "funclet"(token %1) ]
call void @__cxa_end_catch() [ "funclet"(token %1) ]
catchret from %1 to label %try.cont
try.cont: ; preds = %catch, %entry
ret void
}
; Regression test for a bug where, when an invoke unwinds to a catchswitch, the
; catchswitch's unwind destination was not included in the invoke's unwind
; destination when there was no direct link from catch.start to there.
; CHECK-LABEL: unwind_destinations:
; CHECK: block
; CHECK: block
; CHECK: try_table (catch_all 0)
; CHECK: block i32
; CHECK: try_table (catch __cpp_exception 0)
; CHECK: call foo
; CHECK: end_try_table
; CHECK: unreachable
; CHECK: end_block
; CHECK: call _ZSt9terminatev
; CHECK: unreachable
; CHECK: end_try_table
; CHECK: unreachable
; CHECK: end_block
; Note the below is "terminate" BB and should not be DCE'd
; CHECK: call _ZSt9terminatev
; CHECK: unreachable
; CHECK: end_block
define void @unwind_destinations() personality ptr @__gxx_wasm_personality_v0 {
entry:
invoke void @foo()
to label %try.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchswitch within none [label %catch.start] unwind label %terminate
catch.start: ; preds = %catch.dispatch
%1 = catchpad within %0 [ptr null]
%2 = call ptr @llvm.wasm.get.exception(token %1)
%3 = call ptr @__cxa_begin_catch(ptr %2) #5 [ "funclet"(token %1) ]
call void @_ZSt9terminatev() #2 [ "funclet"(token %1) ]
unreachable
; Even if there is no link from catch.start to this terminate BB, when there is
; an exception that catch.start does not catch (e.g. a foreign exception), it
; should end up here, so this BB should NOT be DCE'ed
terminate: ; preds = %catch.dispatch
%4 = cleanuppad within none []
call void @_ZSt9terminatev() #2 [ "funclet"(token %4) ]
unreachable
try.cont: ; preds = %entry
ret void
}
declare void @foo()
declare void @bar(ptr)
declare void @take_i32(i32)
declare i32 @__gxx_wasm_personality_v0(...)
; Function Attrs: noreturn
declare void @llvm.wasm.throw(i32, ptr) #1
; Function Attrs: nounwind
declare ptr @llvm.wasm.get.exception(token) #0
; Function Attrs: nounwind
declare i32 @llvm.wasm.get.ehselector(token) #0
; Function Attrs: noreturn
declare void @llvm.wasm.rethrow() #1
; Function Attrs: nounwind
declare i32 @llvm.eh.typeid.for(ptr) #0
; Function Attrs: nounwind
declare ptr @__cxa_allocate_exception(i32) #0
declare ptr @__cxa_begin_catch(ptr)
declare void @__cxa_end_catch()
; Function Attrs: noreturn
declare void @__cxa_throw(ptr, ptr, ptr) #1
declare void @_ZSt9terminatev()
declare ptr @_ZN4TempD2Ev(ptr returned)
attributes #0 = { nounwind }
attributes #1 = { noreturn }
attributes #2 = { noreturn nounwind }
; CHECK: __cpp_exception:
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