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clang-p2996/llvm/test/CodeGen/WebAssembly/exception-legacy.ll
Heejin Ahn 8b28e2ebb3 [WebAssembly] Rename legacy EH tests (#107166) 
Give each test in `cfg-stackify-eh-legacy.ll` a name rather than
something like `test5`, because I plan to copy many of these test into a
new file that tests for the new EH (exnref) and some of the tests here
are not applicable to the new EH so the numbering will be different,
which can make things confusing.

Also this removes `test_` prefixes in the test function names in
`exception-legacy.ll`, because, well, we all know they are tests.
2024-09-03 21:14:36 -07:00

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; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -wasm-enable-eh -exception-model=wasm -mattr=+exception-handling -verify-machineinstrs | FileCheck --implicit-check-not=ehgcr -allow-deprecated-dag-overlap %s
; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers -wasm-enable-eh -exception-model=wasm -mattr=+exception-handling -verify-machineinstrs -O0
; RUN: llc < %s -disable-wasm-fallthrough-return-opt -wasm-keep-registers -wasm-enable-eh -exception-model=wasm -mattr=+exception-handling
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, $0
; 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:
; CHECK: global.get ${{.+}}=, __stack_pointer
; CHECK: try
; CHECK: call foo
; CHECK: catch $[[EXN:[0-9]+]]=, __cpp_exception
; CHECK: global.set __stack_pointer
; CHECK: i32.{{store|const}} {{.*}} __wasm_lpad_context
; CHECK: call $drop=, _Unwind_CallPersonality, $[[EXN]]
; CHECK: block
; CHECK: br_if 0
; CHECK: call $drop=, __cxa_begin_catch
; CHECK: call __cxa_end_catch
; CHECK: br 1
; CHECK: end_block
; CHECK: rethrow 0
; CHECK: end_try
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: try
; CHECK: call foo
; CHECK: catch_all
; CHECK: global.set __stack_pointer
; CHECK: call $drop=, _ZN4TempD2Ev
; CHECK: rethrow 0
; CHECK: end_try
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
; temrinatepad, because __cxa_end_catch() also can throw within 'catch (...)'.
;
; void foo();
; void terminatepad() {
; try {
; foo();
; } catch (...) {
; foo();
; }
; }
; CHECK-LABEL: terminatepad
; CHECK: try
; CHECK: call foo
; CHECK: catch
; CHECK: call $drop=, __cxa_begin_catch
; CHECK: try
; CHECK: call foo
; CHECK: catch_all
; CHECK: try
; CHECK: call __cxa_end_catch
; CHECK: catch_all
; CHECK: call _ZSt9terminatev
; CHECK: unreachable
; CHECK: end_try
; CHECK: rethrow
; CHECK: end_try
; CHECK: call __cxa_end_catch
; CHECK: end_try
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() [ "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: try
; CHECK: call foo
; CHECK: catch
; CHECK-NOT: global.get $push{{.+}}=, __stack_pointer
; CHECK: global.set __stack_pointer
; CHECK: block
; CHECK: block
; CHECK: br_if 0
; CHECK: call $drop=, __cxa_begin_catch
; CHECK: try
; CHECK: call foo
; CHECK: catch
; CHECK-NOT: global.get $push{{.+}}=, __stack_pointer
; CHECK: global.set __stack_pointer
; CHECK: call __cxa_end_catch
; CHECK: rethrow
; CHECK-NOT: global.set __stack_pointer, $pop{{.+}}
; CHECK: end_try
; CHECK: end_block
; CHECK: rethrow
; CHECK: end_block
; CHECK-NOT: global.set __stack_pointer, $pop{{.+}}
; CHECK: call __cxa_end_catch
; CHECK: end_try
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: try
; CHECK: call foo
; CHECK: catch
; CHECK: call $drop=, __cxa_begin_catch
; CHECK: call __cxa_end_catch
; CHECK: end_try
; CHECK-NOT: global.set __stack_pointer
; CHECK: return
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
}
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
declare ptr @__cxa_begin_catch(ptr)
declare void @__cxa_end_catch()
declare void @_ZSt9terminatev()
declare ptr @_ZN4TempD2Ev(ptr returned)
attributes #0 = { nounwind }
attributes #1 = { noreturn }
; CHECK: __cpp_exception:
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