691927c904
Current assert wiht /EHa:
A single unwind edge may only enter one EH pad
invoke void @llvm.seh.try.begin()
to label %invoke.cont1 unwind label %catch.dispatch2
Current IR:
%1 = catchpad within %0 [ptr null, i32 0, ptr null]
invoke void @llvm.seh.try.begin()
to label %invoke.cont5 unwind label %catch.dispatch2
The problem is the invoke to llvm.seh.try.begin() missing "funclet"
Accodring: https://llvm.org/docs/LangRef.html#ob-funclet
If any "funclet" EH pads have been entered but not exited (per the
description in the EH doc), it is undefined behavior to execute a
call or invoke.
To fix the problem, when emit seh_try_begin, call EmitSehTryScopeBegin,
instead of calling EmitRuntimeCallOrInvoke for proper "funclet"
gerenration.
Differential Revision: https://reviews.llvm.org/D150340
86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
// RUN: %clang_cc1 -triple x86_64-windows -fasync-exceptions -fcxx-exceptions -fexceptions -fms-extensions -x c++ -Wno-implicit-function-declaration -S -emit-llvm %s -o - | FileCheck %s
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// CHECK: define dso_local void @"?crash@@YAXH@Z
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// CHECK: invoke void @llvm.seh.try.begin()
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// CHECK: invoke void @llvm.seh.scope.begin()
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// CHECK: invoke void @llvm.seh.scope.end()
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// CHECK: %[[dst:[0-9-]+]] = catchswitch within none [label %catch] unwind to caller
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// CHECK: %[[dst1:[0-9-]+]] = catchpad within %[[dst]] [ptr null, i32 0, ptr null]
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// CHECK: "funclet"(token %[[dst1]])
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// CHECK: define dso_local void @"?bar@@YAXXZ
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// CHECK: invoke void @llvm.seh.try.begin()
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// CHECK: invoke void @_CxxThrowException
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// CHECK: %[[dst:[0-9-]+]] = catchpad within %0 [ptr null, i32 0, ptr null]
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// CHECK: invoke void @llvm.seh.try.begin() [ "funclet"(token %[[dst]]) ]
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// CHECK: invoke void @llvm.seh.try.begin()
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// CHECK: %[[src:[0-9-]+]] = load volatile i32, ptr %i
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// CHECK-NEXT: invoke void @"?crash@@YAXH@Z"(i32 noundef %[[src]])
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// CHECK: invoke void @llvm.seh.try.end()
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// CHECK: invoke void @llvm.seh.try.begin()
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// CHECK: invoke void @"?bar@@YAXXZ"()
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// CHECK: invoke void @llvm.seh.try.end()
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// *****************************************************************************
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// Abstract: Test CPP catch(...) under SEH -EHa option
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void printf(...);
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int volatile *NullPtr = 0;
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void foo() {
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*NullPtr = 0;
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}
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int *pt1, *pt2, *pt3;
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int g;
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void crash(int i) {
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g = i;
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try {
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struct A {
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A() {
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printf(" in A ctor \n");
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if (g == 0)
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*NullPtr = 0;
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}
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~A() {
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printf(" in A dtor \n");
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}
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} ObjA;
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if (i == 1)
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*NullPtr = 0;
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} catch (...) {
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printf(" in catch(...) funclet \n");
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if (i == 1)
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throw(i);
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}
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}
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void bar() {
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try {
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throw 1;
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} catch(...) {
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try {
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*NullPtr = 0;
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} catch (...) {
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throw 1;
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}
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}
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}
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int main() {
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for (int i = 0; i < 2; i++) {
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__try {
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crash(i);
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} __except (1) {
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printf(" Test CPP unwind: in except handler i = %d \n", i);
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}
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}
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__try {
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bar();
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} __except (1) {
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printf("Test CPP unwind: in except handler \n");
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}
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return 0;
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}
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