mirror of
https://github.com/Gericom/teak-llvm.git
synced 2025-06-23 05:25:50 -04:00
7e66a50bb4
Summary: Because in wasm we merge all catch clauses into one big catchpad, in case none of the types in catch handlers matches after we test against each of them, we should unwind to the next EH enclosing scope. For this, we should NOT use a call to `__cxa_rethrow` but rather a call to our own rethrow intrinsic, because what we're trying to do here is just to transfer the control flow into the next enclosing EH pad (or the caller). Calls to `__cxa_rethrow` should only be used after a call to `__cxa_begin_catch`. Reviewers: dschuff Subscribers: sbc100, jgravelle-google, sunfish, cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D59353 llvm-svn: 356317
385 lines
14 KiB
C++
385 lines
14 KiB
C++
// RUN: %clang_cc1 %s -triple wasm32-unknown-unknown -fms-extensions -fexceptions -fcxx-exceptions -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 -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 i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*)
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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]] [i8* bitcast (i8** @_ZTIi to i8*), i8* bitcast (i8** @_ZTId to i8*)]
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// CHECK-NEXT: %[[EXN:.*]] = call i8* @llvm.wasm.get.exception(token %[[CATCHPAD]])
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// CHECK-NEXT: store i8* %[[EXN]], i8** %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(i8* bitcast (i8** @_ZTIi to i8*)) #2
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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 i8*, i8** %exn.slot
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// CHECK-NEXT: %[[ADDR:.*]] = call i8* @__cxa_begin_catch(i8* %[[EXN]]) {{.*}} [ "funclet"(token %[[CATCHPAD]]) ]
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// CHECK-NEXT: %[[ADDR_CAST:.*]] = bitcast i8* %[[ADDR]] to i32*
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// CHECK-NEXT: %[[INT_VAL:.*]] = load i32, i32* %[[ADDR_CAST]]
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// CHECK-NEXT: store i32 %[[INT_VAL]], i32* %[[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(i8* bitcast (i8** @_ZTId to i8*)) #2
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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.in.catch() {{.*}} [ "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]] [i8* 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]] [i8* bitcast (i8** @_ZTIi to i8*), i8* 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 %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %{{.*}}) {{.*}} [ "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]] [i8* bitcast (i8** @_ZTIi to i8*)]
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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]] [i8* 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: %[[EXN:.*]] = call i8* @llvm.wasm.get.exception(token %[[CLEANUPPAD1]])
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// CHECK-NEXT: call void @__clang_call_terminate(i8* %[[EXN]]) {{.*}} [ "funclet"(token %[[CLEANUPPAD1]]) ]
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// CHECK-NEXT: unreachable
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// CHECK-LABEL: define {{.*}} void @__clang_call_terminate(i8*)
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// CHECK-NEXT: call i8* @__cxa_begin_catch(i8* %{{.*}})
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// CHECK-NEXT: call void @_ZSt9terminatev()
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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 %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* {{.*}}) {{.*}} [ "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]] [i8* bitcast (i8** @_ZTIi to i8*)]
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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.in.catch() {{.*}} [ "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 %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %{{.*}}) {{.*}} [ "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 %struct.Cleanup* @_ZN7CleanupD1Ev(%struct.Cleanup* %{{.*}}) {{.*}} [ "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]] [i8* bitcast (i8** @_ZTIi to i8*), i8* bitcast (i8** @_ZTId to i8*)]
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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.in.catch() {{.*}} [ "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]] [i8* bitcast (i8** @_ZTIi to i8*), i8* 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 @__clang_call_terminate(i8* %{{.*}}) {{.*}} [ "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]] [i8* bitcast (i8** @_ZTIi to i8*)]
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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]] [i8* bitcast (i8** @_ZTIi to i8*)]
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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.in.catch() {{.*}} [ "funclet"(token %[[CATCHPAD1]]) ]
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// CHECK: catchret from %[[CATCHPAD0]] to label
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// CHECK: call void @llvm.wasm.rethrow.in.catch() {{.*}} [ "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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