d1aca0ae2e
When using other specific exception options in Clang, such as
`-fseh-exceptions` or `-fsjlj-exceptions`, Clang defines a corresponding
preprocessor such as `-D__USING_SJLJ_EXCEPTIONS__`. Emscripten does that
in our own build system:
7dcd7f4074/tools/system_libs.py (L1577-L1578)
But to make Wasm EH usable in non-Emscripten toolchain, this has to be
defined somewhere else. This PR makes Wasm EH consistent with other
exception scheme by letting it defined by Clang depending on the
exception option.
We have been using `__USING_WASM_EXCEPTIONS__` in our current library
code, but this changes it to `__WASM_EXCEPTIONS__` for its conciseness,
and I will update other parts of LLVM as follow-ups. This does not break
anything currently working, because we have not been defining anything
in Clang so far.
417 lines
15 KiB
C++
417 lines
15 KiB
C++
// REQUIRES: webassembly-registered-target
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// RUN: %clang -E -dM %s -target wasm32-unknown-unknown -fwasm-exceptions | FileCheck %s -check-prefix PREPROCESSOR
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// PREPROCESSOR: #define __WASM_EXCEPTIONS__ 1
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// RUN: %clang_cc1 %s -triple wasm32-unknown-unknown -fms-extensions -fexceptions -fcxx-exceptions -mllvm -wasm-enable-eh -exception-model=wasm -target-feature +exception-handling -emit-llvm -o - -std=c++11 | FileCheck %s
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// RUN: %clang_cc1 %s -triple wasm64-unknown-unknown -fms-extensions -fexceptions -fcxx-exceptions -mllvm -wasm-enable-eh -exception-model=wasm -target-feature +exception-handling -emit-llvm -o - -std=c++11 | FileCheck %s
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void may_throw();
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void dont_throw() noexcept;
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struct Cleanup {
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~Cleanup() { dont_throw(); }
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};
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// Multiple catch clauses w/o catch-all
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void test0() {
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try {
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may_throw();
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} catch (int) {
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dont_throw();
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} catch (double) {
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dont_throw();
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}
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}
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// CHECK-LABEL: define void @_Z5test0v() {{.*}} personality ptr @__gxx_wasm_personality_v0
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// CHECK: %[[INT_ALLOCA:.*]] = alloca i32
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// CHECK: invoke void @_Z9may_throwv()
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// CHECK-NEXT: to label %[[NORMAL_BB:.*]] unwind label %[[CATCHDISPATCH_BB:.*]]
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// CHECK: [[CATCHDISPATCH_BB]]:
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// CHECK-NEXT: %[[CATCHSWITCH:.*]] = catchswitch within none [label %[[CATCHSTART_BB:.*]]] unwind to caller
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// CHECK: [[CATCHSTART_BB]]:
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// CHECK-NEXT: %[[CATCHPAD:.*]] = catchpad within %[[CATCHSWITCH]] [ptr @_ZTIi, ptr @_ZTId]
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// CHECK-NEXT: %[[EXN:.*]] = call ptr @llvm.wasm.get.exception(token %[[CATCHPAD]])
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// CHECK-NEXT: store ptr %[[EXN]], ptr %exn.slot
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// CHECK-NEXT: %[[SELECTOR:.*]] = call i32 @llvm.wasm.get.ehselector(token %[[CATCHPAD]])
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// CHECK-NEXT: %[[TYPEID:.*]] = call i32 @llvm.eh.typeid.for.p0(ptr @_ZTIi) #7
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// CHECK-NEXT: %[[MATCHES:.*]] = icmp eq i32 %[[SELECTOR]], %[[TYPEID]]
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// CHECK-NEXT: br i1 %[[MATCHES]], label %[[CATCH_INT_BB:.*]], label %[[CATCH_FALLTHROUGH_BB:.*]]
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// CHECK: [[CATCH_INT_BB]]:
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// CHECK-NEXT: %[[EXN:.*]] = load ptr, ptr %exn.slot
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// CHECK-NEXT: %[[ADDR:.*]] = call ptr @__cxa_begin_catch(ptr %[[EXN]]) {{.*}} [ "funclet"(token %[[CATCHPAD]]) ]
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// CHECK-NEXT: %[[INT_VAL:.*]] = load i32, ptr %[[ADDR]]
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// CHECK-NEXT: store i32 %[[INT_VAL]], ptr %[[INT_ALLOCA]]
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// CHECK-NEXT: call void @_Z10dont_throwv() {{.*}} [ "funclet"(token %[[CATCHPAD]]) ]
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// CHECK-NEXT: call void @__cxa_end_catch() {{.*}} [ "funclet"(token %[[CATCHPAD]]) ]
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// CHECK-NEXT: catchret from %[[CATCHPAD]] to label %[[CATCHRET_DEST_BB0:.*]]
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// CHECK: [[CATCHRET_DEST_BB0]]:
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// CHECK-NEXT: br label %[[TRY_CONT_BB:.*]]
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// CHECK: [[CATCH_FALLTHROUGH_BB]]
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// CHECK-NEXT: %[[TYPEID:.*]] = call i32 @llvm.eh.typeid.for.p0(ptr @_ZTId) #7
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// CHECK-NEXT: %[[MATCHES:.*]] = icmp eq i32 %[[SELECTOR]], %[[TYPEID]]
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// CHECK-NEXT: br i1 %[[MATCHES]], label %[[CATCH_FLOAT_BB:.*]], label %[[RETHROW_BB:.*]]
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// CHECK: [[CATCH_FLOAT_BB]]:
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// CHECK: catchret from %[[CATCHPAD]] to label %[[CATCHRET_DEST_BB1:.*]]
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// CHECK: [[CATCHRET_DEST_BB1]]:
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// CHECK-NEXT: br label %[[TRY_CONT_BB]]
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// CHECK: [[RETHROW_BB]]:
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// CHECK-NEXT: call void @llvm.wasm.rethrow() {{.*}} [ "funclet"(token %[[CATCHPAD]]) ]
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// CHECK-NEXT: unreachable
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// Single catch-all
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void test1() {
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try {
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may_throw();
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} catch (...) {
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dont_throw();
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}
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}
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// CATCH-LABEL: @_Z5test1v()
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// CHECK: %[[CATCHSWITCH:.*]] = catchswitch within none [label %[[CATCHSTART_BB:.*]]] unwind to caller
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// CHECK: [[CATCHSTART_BB]]:
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// CHECK-NEXT: %[[CATCHPAD:.*]] = catchpad within %[[CATCHSWITCH]] [ptr null]
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// CHECK: br label %[[CATCH_ALL_BB:.*]]
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// CHECK: [[CATCH_ALL_BB]]:
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// CHECK: catchret from %[[CATCHPAD]] to label
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// Multiple catch clauses w/ catch-all
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void test2() {
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try {
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may_throw();
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} catch (int) {
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dont_throw();
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} catch (...) {
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dont_throw();
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}
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}
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// CHECK-LABEL: @_Z5test2v()
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// CHECK: %[[CATCHSWITCH:.*]] = catchswitch within none [label %[[CATCHSTART_BB:.*]]] unwind to caller
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// CHECK: [[CATCHSTART_BB]]:
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// CHECK-NEXT: %[[CATCHPAD:.*]] = catchpad within %[[CATCHSWITCH]] [ptr @_ZTIi, ptr null]
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// CHECK: br i1 %{{.*}}, label %[[CATCH_INT_BB:.*]], label %[[CATCH_ALL_BB:.*]]
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// CHECK: [[CATCH_INT_BB]]:
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// CHECK: catchret from %[[CATCHPAD]] to label
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// CHECK: [[CATCH_ALL_BB]]:
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// CHECK: catchret from %[[CATCHPAD]] to label
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// Cleanup
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void test3() {
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Cleanup c;
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may_throw();
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}
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// CHECK-LABEL: @_Z5test3v()
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// CHECK: invoke void @_Z9may_throwv()
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// CHECK-NEXT: to label {{.*}} unwind label %[[EHCLEANUP_BB:.*]]
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// CHECK: [[EHCLEANUP_BB]]:
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// CHECK-NEXT: %[[CLEANUPPAD:.*]] = cleanuppad within none []
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// CHECK-NEXT: call noundef ptr @_ZN7CleanupD1Ev(ptr {{[^,]*}} %{{.*}}) {{.*}} [ "funclet"(token %[[CLEANUPPAD]]) ]
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// CHECK-NEXT: cleanupret from %[[CLEANUPPAD]] unwind to caller
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// Possibly throwing function call within a catch
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void test4() {
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try {
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may_throw();
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} catch (int) {
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may_throw();
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}
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}
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// CHECK-LABEL: @_Z5test4v()
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// CHECK: %[[CATCHSWITCH]] = catchswitch within none [label %[[CATCHSTART_BB]]] unwind to caller
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// CHECK: [[CATCHSTART_BB]]:
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// CHECK: %[[CATCHPAD:.*]] = catchpad within %[[CATCHSWITCH]] [ptr @_ZTIi]
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// CHECK: invoke void @_Z9may_throwv() [ "funclet"(token %[[CATCHPAD]]) ]
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// CHECK-NEXT: to label %[[INVOKE_CONT_BB:.*]] unwind label %[[EHCLEANUP_BB:.*]]
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// CHECK: [[INVOKE_CONT_BB]]:
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// CHECK-NEXT: call void @__cxa_end_catch() {{.*}} [ "funclet"(token %[[CATCHPAD]]) ]
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// CHECK-NEXT: catchret from %[[CATCHPAD]] to label
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// CHECK: [[EHCLEANUP_BB]]:
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// CHECK-NEXT: %[[CLEANUPPAD:.*]] = cleanuppad within %[[CATCHPAD]] []
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// CHECK-NEXT: call void @__cxa_end_catch() {{.*}} [ "funclet"(token %[[CLEANUPPAD]]) ]
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// CHECK-NEXT: cleanupret from %[[CLEANUPPAD]] unwind to caller
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// Possibly throwing function call within a catch-all
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void test5() {
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try {
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may_throw();
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} catch (...) {
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may_throw();
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}
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}
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// CHECK-LABEL: @_Z5test5v()
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// CHECK: %[[CATCHSWITCH:.*]] = catchswitch within none [label %[[CATCHSTART_BB]]] unwind to caller
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// CHECK: [[CATCHSTART_BB]]:
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// CHECK: %[[CATCHPAD:.*]] = catchpad within %[[CATCHSWITCH]] [ptr null]
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// CHECK: invoke void @_Z9may_throwv() [ "funclet"(token %[[CATCHPAD]]) ]
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// CHECK-NEXT: to label %[[INVOKE_CONT_BB0:.*]] unwind label %[[EHCLEANUP_BB:.*]]
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// CHECK: [[INVOKE_CONT_BB0]]:
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// CHECK-NEXT: call void @__cxa_end_catch() [ "funclet"(token %[[CATCHPAD]]) ]
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// CHECK-NEXT: catchret from %[[CATCHPAD]] to label
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// CHECK: [[EHCLEANUP_BB]]:
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// CHECK-NEXT: %[[CLEANUPPAD0:.*]] = cleanuppad within %[[CATCHPAD]] []
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// CHECK-NEXT: invoke void @__cxa_end_catch() [ "funclet"(token %[[CLEANUPPAD0]]) ]
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// CHECK-NEXT: to label %[[INVOKE_CONT_BB1:.*]] unwind label %[[TERMINATE_BB:.*]]
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// CHECK: [[INVOKE_CONT_BB1]]:
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// CHECK-NEXT: cleanupret from %[[CLEANUPPAD0]] unwind to caller
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// CHECK: [[TERMINATE_BB]]:
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// CHECK-NEXT: %[[CLEANUPPAD1:.*]] = cleanuppad within %[[CLEANUPPAD0]] []
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// CHECK-NEXT: call void @_ZSt9terminatev() {{.*}} [ "funclet"(token %[[CLEANUPPAD1]]) ]
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// CHECK-NEXT: unreachable
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// Try-catch with cleanups
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void test6() {
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Cleanup c1;
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try {
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Cleanup c2;
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may_throw();
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} catch (int) {
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Cleanup c3;
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may_throw();
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}
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}
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// CHECK-LABEL: @_Z5test6v()
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// CHECK: invoke void @_Z9may_throwv()
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// CHECK-NEXT: to label %{{.*}} unwind label %[[EHCLEANUP_BB0:.*]]
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// CHECK: [[EHCLEANUP_BB0]]:
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// CHECK-NEXT: %[[CLEANUPPAD0:.*]] = cleanuppad within none []
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// CHECK-NEXT: call noundef ptr @_ZN7CleanupD1Ev(ptr {{.*}}) {{.*}} [ "funclet"(token %[[CLEANUPPAD0]]) ]
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// CHECK-NEXT: cleanupret from %[[CLEANUPPAD0]] unwind label %[[CATCH_DISPATCH_BB:.*]]
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// CHECK: [[CATCH_DISPATCH_BB]]:
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// CHECK-NEXT: %[[CATCHSWITCH:.*]] = catchswitch within none [label %[[CATCHSTART_BB:.*]]] unwind label %[[EHCLEANUP_BB1:.*]]
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// CHECK: [[CATCHSTART_BB]]:
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// CHECK-NEXT: %[[CATCHPAD:.*]] = catchpad within %[[CATCHSWITCH]] [ptr @_ZTIi]
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// CHECK: br i1 %{{.*}}, label %[[CATCH_INT_BB:.*]], label %[[RETHROW_BB:.*]]
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// CHECK: [[CATCH_INT_BB]]:
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// CHECK: invoke void @_Z9may_throwv() [ "funclet"(token %[[CATCHPAD]]) ]
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// CHECK-NEXT: to label %[[INVOKE_CONT_BB:.*]] unwind label %[[EHCLEANUP_BB2:.*]]
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// CHECK: [[INVOKE_CONT_BB]]:
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// CHECK: catchret from %[[CATCHPAD]] to label %{{.*}}
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// CHECK: [[RETHROW_BB]]:
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// CHECK-NEXT: invoke void @llvm.wasm.rethrow() {{.*}} [ "funclet"(token %[[CATCHPAD]]) ]
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// CHECK-NEXT: to label %[[UNREACHABLE_BB:.*]] unwind label %[[EHCLEANUP_BB1:.*]]
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// CHECK: [[EHCLEANUP_BB2]]:
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// CHECK-NEXT: %[[CLEANUPPAD2:.*]] = cleanuppad within %[[CATCHPAD]] []
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// CHECK-NEXT: call noundef ptr @_ZN7CleanupD1Ev(ptr {{[^,]*}} %{{.*}}) {{.*}} [ "funclet"(token %[[CLEANUPPAD2]]) ]
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// CHECK-NEXT: cleanupret from %[[CLEANUPPAD2]] unwind label %[[EHCLEANUP_BB3:.*]]
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// CHECK: [[EHCLEANUP_BB3]]:
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// CHECK-NEXT: %[[CLEANUPPAD3:.*]] = cleanuppad within %[[CATCHPAD]] []
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// CHECK: cleanupret from %[[CLEANUPPAD3]] unwind label %[[EHCLEANUP_BB1:.*]]
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// CHECK: [[EHCLEANUP_BB1]]:
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// CHECK-NEXT: %[[CLEANUPPAD1:.*]] = cleanuppad within none []
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// CHECK-NEXT: call noundef ptr @_ZN7CleanupD1Ev(ptr {{[^,]*}} %{{.*}}) {{.*}} [ "funclet"(token %[[CLEANUPPAD1]]) ]
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// CHECK-NEXT: cleanupret from %[[CLEANUPPAD1]] unwind to caller
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// CHECK: [[UNREACHABLE_BB]]:
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// CHECK-NEXT: unreachable
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// Nested try-catches within a try with cleanups
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void test7() {
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Cleanup c1;
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may_throw();
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try {
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Cleanup c2;
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may_throw();
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try {
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Cleanup c3;
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may_throw();
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} catch (int) {
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may_throw();
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} catch (double) {
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may_throw();
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}
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} catch (int) {
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may_throw();
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} catch (...) {
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may_throw();
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}
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}
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// CHECK-LABEL: @_Z5test7v()
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// CHECK: invoke void @_Z9may_throwv()
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// CHECK: invoke void @_Z9may_throwv()
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// CHECK: invoke void @_Z9may_throwv()
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// CHECK: %[[CLEANUPPAD0:.*]] = cleanuppad within none []
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// CHECK: cleanupret from %[[CLEANUPPAD0]] unwind label
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// CHECK: %[[CATCHSWITCH0:.*]] = catchswitch within none
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// CHECK: %[[CATCHPAD0:.*]] = catchpad within %[[CATCHSWITCH0]] [ptr @_ZTIi, ptr @_ZTId]
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// CHECK: invoke void @_Z9may_throwv() [ "funclet"(token %[[CATCHPAD0]]) ]
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// CHECK: catchret from %[[CATCHPAD0]] to label
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// CHECK: invoke void @_Z9may_throwv() [ "funclet"(token %[[CATCHPAD0]]) ]
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// CHECK: catchret from %[[CATCHPAD0]] to label
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// CHECK: invoke void @llvm.wasm.rethrow() {{.*}} [ "funclet"(token %[[CATCHPAD0]]) ]
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// CHECK: %[[CLEANUPPAD1:.*]] = cleanuppad within %[[CATCHPAD0]] []
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// CHECK: cleanupret from %[[CLEANUPPAD1]] unwind label
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// CHECK: %[[CLEANUPPAD2:.*]] = cleanuppad within %[[CATCHPAD0]] []
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// CHECK: cleanupret from %[[CLEANUPPAD2]] unwind label
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// CHECK: %[[CLEANUPPAD3:.*]] = cleanuppad within none []
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// CHECK: cleanupret from %[[CLEANUPPAD3]] unwind label
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// CHECK: %[[CATCHSWITCH1:.*]] = catchswitch within none
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// CHECK: %[[CATCHPAD1:.*]] = catchpad within %[[CATCHSWITCH1]] [ptr @_ZTIi, ptr null]
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// CHECK: invoke void @_Z9may_throwv() [ "funclet"(token %[[CATCHPAD1]]) ]
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// CHECK: catchret from %[[CATCHPAD1]] to label
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// CHECK: invoke void @_Z9may_throwv() [ "funclet"(token %[[CATCHPAD1]]) ]
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// CHECK: invoke void @__cxa_end_catch() [ "funclet"(token %[[CATCHPAD1]]) ]
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// CHECK: catchret from %[[CATCHPAD1]] to label
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// CHECK: %[[CLEANUPPAD4:.*]] = cleanuppad within %[[CATCHPAD1]] []
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// CHECK: invoke void @__cxa_end_catch() [ "funclet"(token %[[CLEANUPPAD4]]) ]
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// CHECK: cleanupret from %[[CLEANUPPAD4]] unwind label
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// CHECK: %[[CLEANUPPAD5:.*]] = cleanuppad within %[[CATCHPAD1]] []
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// CHECK: cleanupret from %[[CLEANUPPAD5]] unwind label
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// CHECK: %[[CLEANUPPAD6:.*]] = cleanuppad within none []
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// CHECK: cleanupret from %[[CLEANUPPAD6]] unwind to caller
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// CHECK: unreachable
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// CHECK: %[[CLEANUPPAD7:.*]] = cleanuppad within %[[CLEANUPPAD4]] []
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// CHECK: call void @_ZSt9terminatev() {{.*}} [ "funclet"(token %[[CLEANUPPAD7]]) ]
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// CHECK: unreachable
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// Nested try-catches within a catch
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void test8() {
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try {
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may_throw();
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} catch (int) {
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try {
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may_throw();
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} catch (int) {
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may_throw();
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}
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}
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}
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// CHECK-LABEL: @_Z5test8v()
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// CHECK: invoke void @_Z9may_throwv()
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// CHECK: %[[CATCHSWITCH0:.*]] = catchswitch within none
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// CHECK: %[[CATCHPAD0:.*]] = catchpad within %[[CATCHSWITCH0]] [ptr @_ZTIi]
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// CHECK: invoke void @_Z9may_throwv() [ "funclet"(token %[[CATCHPAD0]]) ]
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// CHECK: %[[CATCHSWITCH1:.*]] = catchswitch within %[[CATCHPAD0]]
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// CHECK: %[[CATCHPAD1:.*]] = catchpad within %[[CATCHSWITCH1]] [ptr @_ZTIi]
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// CHECK: invoke void @_Z9may_throwv() [ "funclet"(token %[[CATCHPAD1]]) ]
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// CHECK: catchret from %[[CATCHPAD1]] to label
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// CHECK: invoke void @llvm.wasm.rethrow() {{.*}} [ "funclet"(token %[[CATCHPAD1]]) ]
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// CHECK: catchret from %[[CATCHPAD0]] to label
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// CHECK: call void @llvm.wasm.rethrow() {{.*}} [ "funclet"(token %[[CATCHPAD0]]) ]
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// CHECK: unreachable
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// CHECK: %[[CLEANUPPAD0:.*]] = cleanuppad within %[[CATCHPAD1]] []
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// CHECK: cleanupret from %[[CLEANUPPAD0]] unwind label
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// CHECK: %[[CLEANUPPAD1:.*]] = cleanuppad within %[[CATCHPAD0]] []
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// CHECK: cleanupret from %[[CLEANUPPAD1]] unwind to caller
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// CHECK: unreachable
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// RUN: %clang_cc1 %s -triple wasm32-unknown-unknown -fms-extensions -fexceptions -fcxx-exceptions -exception-model=wasm -target-feature +exception-handling -emit-llvm -o - -std=c++11 2>&1 | FileCheck %s --check-prefix=WARNING-DEFAULT
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// RUN: %clang_cc1 %s -triple wasm32-unknown-unknown -fms-extensions -fexceptions -fcxx-exceptions -exception-model=wasm -target-feature +exception-handling -Wwasm-exception-spec -emit-llvm -o - -std=c++11 2>&1 | FileCheck %s --check-prefix=WARNING-ON
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// RUN: %clang_cc1 %s -triple wasm32-unknown-unknown -fms-extensions -fexceptions -fcxx-exceptions -exception-model=wasm -target-feature +exception-handling -Wno-wasm-exception-spec -emit-llvm -o - -std=c++11 2>&1 | FileCheck %s --check-prefix=WARNING-OFF
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// RUN: %clang_cc1 %s -triple wasm32-unknown-unknown -fexceptions -fcxx-exceptions -emit-llvm -o - -std=c++11 2>&1 | FileCheck %s --check-prefix=EM-EH-WARNING
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// Wasm EH ignores dynamic exception specifications with types at the moment.
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// This is controlled by -Wwasm-exception-spec, which is on by default. This
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// warning can be suppressed with -Wno-wasm-exception-spec. Checks if a warning
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// message is correctly printed or not printed depending on the options.
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void test9() throw(int) {
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}
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// WARNING-DEFAULT: warning: dynamic exception specifications with types are currently ignored in wasm
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// WARNING-ON: warning: dynamic exception specifications with types are currently ignored in wasm
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// WARNING-OFF-NOT: warning: dynamic exception specifications with types are currently ignored in wasm
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// EM-EH-WARNING: warning: dynamic exception specifications with types are currently ignored in wasm
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// Wasm curremtly treats 'throw()' in the same way as 'noexept'. Check if the
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// same warning message is printed as if when a 'noexcept' function throws.
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void test10() throw() {
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throw 3;
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}
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// WARNING-DEFAULT: warning: 'test10' has a non-throwing exception specification but can still throw
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// WARNING-DEFAULT: function declared non-throwing here
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// Here we only check if the command enables wasm exception handling in the
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// backend so that exception handling instructions can be generated in .s file.
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// RUN: %clang_cc1 %s -triple wasm32-unknown-unknown -fms-extensions -fexceptions -fcxx-exceptions -mllvm -wasm-enable-eh -exception-model=wasm -target-feature +exception-handling -S -o - -std=c++11 | FileCheck %s --check-prefix=ASSEMBLY
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// ASSEMBLY: try
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// ASSEMBLY: catch
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// ASSEMBLY: rethrow
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// ASSEMBLY: end_try
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