c34735148f
This avoids encoding information about the function prototype into the thunk at the cost of some function prototype bitcast gymnastics. Fixes PR20653. llvm-svn: 216782
102 lines
4.5 KiB
C++
102 lines
4.5 KiB
C++
// RUN: %clang_cc1 -fno-rtti -emit-llvm -triple=i386-pc-win32 %s -o - | FileCheck %s
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// In each test case, we have two member pointers whose thunks have the same
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// vtable offset and same mangling, but their prototypes conflict. The
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// arguments and return type may differ. Therefore, we have to bitcast the
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// function prototype. Unfortunately, if the return types differ, LLVM's
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// optimizers can get upset.
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namespace num_params {
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struct A { virtual void a(int); };
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struct B { virtual void b(int, int); };
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struct C : A, B {
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virtual void a(int);
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virtual void b(int, int);
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};
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void f(C *c) {
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(c->*(&C::a))(0);
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(c->*(&C::b))(0, 0);
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}
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}
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// CHECK-LABEL: define void @"\01?f@num_params@@YAXPAUC@1@@Z"(%"struct.num_params::C"* %c)
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// CHECK: call x86_thiscallcc void bitcast (void (%"struct.num_params::C"*, ...)* @"\01??_9C@num_params@@$BA@AE" to void (%"struct.num_params::C"*, i32)*)(%"struct.num_params::C"* %{{.*}}, i32 0)
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// CHECK: call x86_thiscallcc void bitcast (void (%"struct.num_params::C"*, ...)* @"\01??_9C@num_params@@$BA@AE" to void (%"struct.num_params::C"*, i32, i32)*)(%"struct.num_params::C"* %{{.*}}, i32 0, i32 0)
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// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"\01??_9C@num_params@@$BA@AE"(%"struct.num_params::C"* %this, ...)
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// CHECK: musttail call x86_thiscallcc void (%"struct.num_params::C"*, ...)* %{{.*}}(%"struct.num_params::C"* %{{.*}}, ...)
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// CHECK-NEXT: ret void
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namespace i64_return {
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struct A { virtual int a(); };
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struct B { virtual long long b(); };
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struct C : A, B {
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virtual int a();
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virtual long long b();
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};
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long long f(C *c) {
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int x = (c->*(&C::a))();
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long long y = (c->*(&C::b))();
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return x + y;
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}
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}
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// CHECK-LABEL: define i64 @"\01?f@i64_return@@YA_JPAUC@1@@Z"(%"struct.i64_return::C"* %c)
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// CHECK: call x86_thiscallcc i32 bitcast (void (%"struct.i64_return::C"*, ...)* @"\01??_9C@i64_return@@$BA@AE" to i32 (%"struct.i64_return::C"*)*)(%"struct.i64_return::C"* %{{.*}})
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// CHECK: call x86_thiscallcc i64 bitcast (void (%"struct.i64_return::C"*, ...)* @"\01??_9C@i64_return@@$BA@AE" to i64 (%"struct.i64_return::C"*)*)(%"struct.i64_return::C"* %{{.*}})
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// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"\01??_9C@i64_return@@$BA@AE"(%"struct.i64_return::C"* %this, ...)
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// CHECK: musttail call x86_thiscallcc void (%"struct.i64_return::C"*, ...)* %{{.*}}(%"struct.i64_return::C"* %{{.*}}, ...)
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// CHECK-NEXT: ret void
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namespace sret {
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struct Big { int big[32]; };
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struct A { virtual int a(); };
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struct B { virtual Big b(); };
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struct C : A, B {
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virtual int a();
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virtual Big b();
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};
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void f(C *c) {
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(c->*(&C::a))();
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Big b((c->*(&C::b))());
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}
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}
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// CHECK-LABEL: define void @"\01?f@sret@@YAXPAUC@1@@Z"(%"struct.sret::C"* %c)
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// CHECK: call x86_thiscallcc i32 bitcast (void (%"struct.sret::C"*, ...)* @"\01??_9C@sret@@$BA@AE" to i32 (%"struct.sret::C"*)*)(%"struct.sret::C"* %{{.*}})
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// CHECK: call x86_thiscallcc void bitcast (void (%"struct.sret::C"*, ...)* @"\01??_9C@sret@@$BA@AE" to void (%"struct.sret::C"*, %"struct.sret::Big"*)*)(%"struct.sret::C"* %{{.*}}, %"struct.sret::Big"* sret %{{.*}})
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// CHECK-LABEL: define linkonce_odr x86_thiscallcc void @"\01??_9C@sret@@$BA@AE"(%"struct.sret::C"* %this, ...)
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// CHECK: musttail call x86_thiscallcc void (%"struct.sret::C"*, ...)* %{{.*}}(%"struct.sret::C"* %{{.*}}, ...)
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// CHECK-NEXT: ret void
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namespace cdecl_inalloca {
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// Fairly evil, since now we end up doing an inalloca-style call through a
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// thunk that doesn't use inalloca. Hopefully the stacks line up?
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struct Big {
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Big();
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~Big();
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int big[32];
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};
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struct A { virtual void __cdecl a(); };
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struct B { virtual void __cdecl b(Big); };
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struct C : A, B {
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virtual void __cdecl a();
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virtual void __cdecl b(Big);
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};
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void f(C *c) {
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Big b;
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(c->*(&C::a))();
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((c->*(&C::b))(b));
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}
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}
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// CHECK-LABEL: define void @"\01?f@cdecl_inalloca@@YAXPAUC@1@@Z"(%"struct.cdecl_inalloca::C"* %c)
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// CHECK: call void bitcast (void (%"struct.cdecl_inalloca::C"*, ...)* @"\01??_9C@cdecl_inalloca@@$BA@AE" to void (%"struct.cdecl_inalloca::C"*)*)(%"struct.cdecl_inalloca::C"* %{{.*}})
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// CHECK: call void bitcast (void (%"struct.cdecl_inalloca::C"*, ...)* @"\01??_9C@cdecl_inalloca@@$BA@AE" to void (<{ %"struct.cdecl_inalloca::C"*, %"struct.cdecl_inalloca::Big" }>*)*)(<{ %"struct.cdecl_inalloca::C"*, %"struct.cdecl_inalloca::Big" }>* inalloca %{{.*}})
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// CHECK-LABEL: define linkonce_odr void @"\01??_9C@cdecl_inalloca@@$BA@AE"(%"struct.cdecl_inalloca::C"* %this, ...)
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// CHECK: musttail call void (%"struct.cdecl_inalloca::C"*, ...)* %{{.*}}(%"struct.cdecl_inalloca::C"* %{{.*}}, ...)
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// CHECK-NEXT: ret void
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