clang/test/CodeGenCXX/microsoft-abi-eh-catch.cpp

   1 // RUN: %clang_cc1 -std=c++11 -emit-llvm %s -o - -triple=x86_64-pc-windows-msvc \
   2 // RUN:     -mconstructor-aliases -fexceptions -fcxx-exceptions \
   3 // RUN:     -O1 -disable-llvm-passes \
   4 // RUN:     | FileCheck -check-prefix WIN64 %s
   5
   6 extern "C" void might_throw();
   7
   8 // Simplify the generated IR with noexcept.
   9 extern "C" void recover() noexcept(true);
  10 extern "C" void handle_exception(void *e) noexcept(true);
  11
  12 extern "C" void catch_all() {
  13   try {
  14     might_throw();
  15   } catch (...) {
  16     recover();
  17   }
  18 }
  19
  20 // WIN64-LABEL: define dso_local void @catch_all()
  21 // WIN64: invoke void @might_throw()
  22 // WIN64-NEXT: to label %[[cont:[^ ]*]] unwind label %[[catchswitch_lpad:[^ ]*]]
  23 //
  24 // WIN64: [[catchswitch_lpad]]
  25 // WIN64: %[[catchswitch:[^ ]*]] = catchswitch within none [label %[[catchpad_lpad:[^ ]*]]] unwind to caller
  26 //
  27 // WIN64: [[catchpad_lpad]]
  28 // WIN64: catchpad within %[[catchswitch]] [ptr null, i32 64, ptr null]
  29 // WIN64: call void @recover()
  30 // WIN64: catchret from %{{.*}} to label %[[catchret:[^ ]*]]
  31 //
  32 // WIN64: [[catchret]]
  33 // WIN64-NEXT: br label %[[ret:[^ ]*]]
  34 //
  35 // WIN64: [[ret]]
  36 // WIN64: ret void
  37 //
  38 // WIN64: [[cont]]
  39 // WIN64: br label %[[ret]]
  40
  41 extern "C" void catch_int() {
  42   try {
  43     might_throw();
  44   } catch (int e) {
  45     handle_exception(&e);
  46   }
  47 }
  48
  49 // WIN64-LABEL: define dso_local void @catch_int()
  50 // WIN64: catchpad within %{{[^ ]*}} [ptr @"??_R0H@8", i32 0, ptr %[[e_addr:.*]]]
  51 //
  52 // The catchpad instruction starts the lifetime of 'e'. Unfortunately, that
  53 // leaves us with nowhere to put lifetime.start, so we don't emit lifetime
  54 // markers for now.
  55 // WIN64-NOT: lifetime.start
  56 //
  57 // WIN64-NOT: lifetime.start
  58 // WIN64: call void @handle_exception
  59 // WIN64-SAME: (ptr noundef %[[e_addr]])
  60 // WIN64-NOT: lifetime.end
  61 // WIN64: catchret
  62
  63 extern "C" void catch_int_unnamed() {
  64   try {
  65     might_throw();
  66   } catch (int) {
  67   }
  68 }
  69
  70 // WIN64-LABEL: define dso_local void @catch_int_unnamed()
  71 // WIN64: catchpad within %{{.*}} [ptr @"??_R0H@8", i32 0, ptr null]
  72 // WIN64: catchret
  73
  74 struct A {
  75   A();
  76   A(const A &o);
  77   ~A();
  78   int a;
  79 };
  80
  81 struct B : A {
  82   B();
  83   B(const B &o);
  84   ~B();
  85   int b;
  86 };
  87
  88 extern "C" void catch_a_byval() {
  89   try {
  90     might_throw();
  91   } catch (A e) {
  92     handle_exception(&e);
  93   }
  94 }
  95
  96 // WIN64-LABEL: define dso_local void @catch_a_byval()
  97 // WIN64: %[[e_addr:[^ ]*]] = alloca %struct.A
  98 // WIN64: catchpad within %{{[^ ]*}} [ptr @"??_R0?AUA@@@8", i32 0, ptr %[[e_addr]]]
  99 // WIN64: call void @handle_exception(ptr noundef %[[e_addr]])
 100 // WIN64: catchret
 101
 102 extern "C" void catch_a_ref() {
 103   try {
 104     might_throw();
 105   } catch (A &e) {
 106     handle_exception(&e);
 107   }
 108 }
 109
 110 // WIN64-LABEL: define dso_local void @catch_a_ref()
 111 // WIN64: %[[e_addr:[^ ]*]] = alloca ptr
 112 // WIN64: catchpad within %{{[^ ]*}} [ptr @"??_R0?AUA@@@8", i32 8, ptr %[[e_addr]]]
 113 // WIN64: %[[eptr:[^ ]*]] = load ptr, ptr %[[e_addr]]
 114 // WIN64: call void @handle_exception(ptr noundef %[[eptr]])
 115 // WIN64: catchret
 116
 117 extern "C" void fn_with_exc_spec() throw(int) {
 118   might_throw();
 119 }
 120
 121 // WIN64-LABEL: define dso_local void @fn_with_exc_spec()
 122 // WIN64: call void @might_throw()
 123 // WIN64-NEXT: ret void
 124
 125 extern "C" void catch_nested() {
 126   try {
 127     might_throw();
 128   } catch (int) {
 129     try {
 130       might_throw();
 131     } catch (int) {
 132       might_throw();
 133     }
 134   }
 135 }
 136
 137 // WIN64-LABEL: define dso_local void @catch_nested()
 138 // WIN64: invoke void @might_throw()
 139 // WIN64-NEXT: to label %{{.*}} unwind label %[[catchswitch_outer:[^ ]*]]
 140 //
 141 // WIN64: [[catchswitch_outer]]
 142 // WIN64: %[[catchswitch_outer_scope:[^ ]*]] = catchswitch within none [label %[[catch_int_outer:[^ ]*]]] unwind to caller
 143 //
 144 // WIN64: [[catch_int_outer]]
 145 // WIN64: %[[catchpad:[^ ]*]] = catchpad within %[[catchswitch_outer_scope]] [ptr @"??_R0H@8", i32 0, ptr null]
 146 // WIN64: invoke void @might_throw()
 147 // WIN64-NEXT: to label %[[cont2:[^ ]*]] unwind label %[[catchswitch_inner:[^ ]*]]
 148 //
 149 // WIN64: [[catchswitch_inner]]
 150 // WIN64: %[[catchswitch_inner_scope:[^ ]*]] = catchswitch within %[[catchpad]] [label %[[catch_int_inner:[^ ]*]]] unwind to caller
 151 //
 152 // WIN64: [[catch_int_inner]]
 153 // WIN64: catchpad within %[[catchswitch_inner_scope]] [ptr @"??_R0H@8", i32 0, ptr null]
 154 // WIN64-NEXT: call void @might_throw()
 155 // WIN64: catchret {{.*}} to label %[[catchret2:[^ ]*]]
 156 //
 157 // WIN64: [[catchret2]]
 158 // WIN64: catchret {{.*}} to label %[[mainret:[^ ]*]]
 159 //
 160 // WIN64: [[mainret]]
 161 // WIN64: ret void