diff options
author | Piotr Padlewski <prazek@google.com> | 2015-08-18 03:52:00 +0000 |
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committer | Piotr Padlewski <prazek@google.com> | 2015-08-18 03:52:00 +0000 |
commit | 552bb91a0ff386a0c1e46a798cb7ea6725320ddc (patch) | |
tree | b0525371ee6af0a8afdbbb7c29ed112b7d9e8af2 /test/CodeGenCXX/vtable-assume-load.cpp | |
parent | 9c728e4814e2f933f5241fec4ccfbfc64cb4f97b (diff) |
Generating assumption loads of vptr after ctor call (fixed)
Generating call assume(icmp %vtable, %global_vtable) after constructor
call for devirtualization purposes.
For more info go to:
http://lists.llvm.org/pipermail/cfe-dev/2015-July/044227.html
Edit:
Fixed version because of PR24479.
http://reviews.llvm.org/D11859
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@245264 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGenCXX/vtable-assume-load.cpp')
-rw-r--r-- | test/CodeGenCXX/vtable-assume-load.cpp | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/test/CodeGenCXX/vtable-assume-load.cpp b/test/CodeGenCXX/vtable-assume-load.cpp new file mode 100644 index 0000000000..5ea9e75524 --- /dev/null +++ b/test/CodeGenCXX/vtable-assume-load.cpp @@ -0,0 +1,172 @@ +// RUN: %clang_cc1 %s -triple x86_64-apple-darwin10 -emit-llvm -o %t.ll -O1 -disable-llvm-optzns -fms-extensions +// RUN: %clang_cc1 %s -triple i686-pc-win32 -emit-llvm -o %t.ms.ll -O1 -disable-llvm-optzns -fms-extensions + +// RUN: FileCheck --check-prefix=CHECK1 --input-file=%t.ll %s +// RUN: FileCheck --check-prefix=CHECK2 --input-file=%t.ll %s +// RUN: FileCheck --check-prefix=CHECK3 --input-file=%t.ll %s +// RUN: FileCheck --check-prefix=CHECK4 --input-file=%t.ll %s +// RUN: FileCheck --check-prefix=CHECK-MS --input-file=%t.ms.ll %s + +namespace test1 { + +struct A { + A(); + virtual void foo(); +}; + +struct B : A { + virtual void foo(); +}; + +void g(A *a) { a->foo(); } + +// CHECK1-LABEL: define void @_ZN5test14fooAEv() +// CHECK1: call void @_ZN5test11AC1Ev(%"struct.test1::A"* +// CHECK1: %[[VTABLE:.*]] = load i8**, i8*** %{{.*}} +// CHECK1: %[[CMP:.*]] = icmp eq i8** %[[VTABLE]], getelementptr inbounds ([3 x i8*], [3 x i8*]* @_ZTVN5test11AE, i64 0, i64 2) +// CHECK1: call void @llvm.assume(i1 %[[CMP]]) +// CHECK1-LABEL: } + +void fooA() { + A a; + g(&a); +} + +// CHECK1-LABEL: define void @_ZN5test14fooBEv() +// CHECK1: call void @_ZN5test11BC1Ev(%"struct.test1::B"* %{{.*}}) +// CHECK1: %[[VTABLE:.*]] = load i8**, i8*** %{{.*}} +// CHECK1: %[[CMP:.*]] = icmp eq i8** %[[VTABLE]], getelementptr inbounds ([3 x i8*], [3 x i8*]* @_ZTVN5test11BE, i64 0, i64 2) +// CHECK1: call void @llvm.assume(i1 %[[CMP]]) +// CHECK1-LABEL: } + +void fooB() { + B b; + g(&b); +} +// there should not be any assumes in the ctor that calls base ctor +// CHECK1-LABEL: define linkonce_odr void @_ZN5test11BC2Ev(%"struct.test1::B"* +// CHECK1-NOT: @llvm.assume( +// CHECK1-LABEL: } +} +namespace test2 { +struct A { + A(); + virtual void foo(); +}; + +struct B { + B(); + virtual void bar(); +}; + +struct C : A, B { + C(); + virtual void foo(); +}; +void g(A *a) { a->foo(); } +void h(B *b) { b->bar(); } + +// CHECK2-LABEL: define void @_ZN5test24testEv() +// CHECK2: call void @_ZN5test21CC1Ev(%"struct.test2::C"* +// CHECK2: %[[VTABLE:.*]] = load i8**, i8*** {{.*}} +// CHECK2: %[[CMP:.*]] = icmp eq i8** %[[VTABLE]], getelementptr inbounds ([6 x i8*], [6 x i8*]* @_ZTVN5test21CE, i64 0, i64 2) +// CHECK2: call void @llvm.assume(i1 %[[CMP]]) + +// CHECK2: %[[V2:.*]] = bitcast %"struct.test2::C"* %{{.*}} to i8* +// CHECK2: %[[ADD_PTR:.*]] = getelementptr inbounds i8, i8* %[[V2]], i64 8 +// CHECK2: %[[V3:.*]] = bitcast i8* %[[ADD_PTR]] to i8*** +// CHECK2: %[[VTABLE2:.*]] = load i8**, i8*** %[[V3]] +// CHECK2: %[[CMP2:.*]] = icmp eq i8** %[[VTABLE2]], getelementptr inbounds ([6 x i8*], [6 x i8*]* @_ZTVN5test21CE, i64 0, i64 5) +// CHECK2: call void @llvm.assume(i1 %[[CMP2]]) + +// CHECK2: call void @_ZN5test21gEPNS_1AE( +// CHECK2-LABEL: } + +void test() { + C c; + g(&c); + h(&c); +} +} + +namespace test3 { +struct A { + A(); +}; + +struct B : A { + B(); + virtual void foo(); +}; + +struct C : virtual A, B { + C(); + virtual void foo(); +}; +void g(B *a) { a->foo(); } + +// CHECK3-LABEL: define void @_ZN5test34testEv() +// CHECK3: call void @_ZN5test31CC1Ev(%"struct.test3::C"* +// CHECK3: %[[CMP:.*]] = icmp eq i8** %{{.*}}, getelementptr inbounds ([4 x i8*], [4 x i8*]* @_ZTVN5test31CE, i64 0, i64 3) +// CHECK3: call void @llvm.assume(i1 %[[CMP]]) +// CHECK3-LABLEL: } +void test() { + C c; + g(&c); +} +} // test3 + +namespace test4 { +struct A { + A(); + virtual void foo(); +}; + +struct B : virtual A { + B(); + virtual void foo(); +}; +struct C : B { + C(); + virtual void foo(); +}; + +void g(C *c) { c->foo(); } + +// CHECK4-LABEL: define void @_ZN5test44testEv() +// CHECK4: call void @_ZN5test41CC1Ev(%"struct.test4::C"* +// CHECK4: %[[VTABLE:.*]] = load i8**, i8*** %{{.*}} +// CHECK4: %[[CMP:.*]] = icmp eq i8** %[[VTABLE]], getelementptr inbounds ([5 x i8*], [5 x i8*]* @_ZTVN5test41CE, i64 0, i64 4) +// CHECK4: call void @llvm.assume(i1 %[[CMP]] + +// CHECK4: %[[VTABLE2:.*]] = load i8**, i8*** %{{.*}} +// CHECK4: %[[CMP2:.*]] = icmp eq i8** %[[VTABLE2]], getelementptr inbounds ([5 x i8*], [5 x i8*]* @_ZTVN5test41CE, i64 0, i64 4) +// CHECK4: call void @llvm.assume(i1 %[[CMP2]]) +// CHECK4-LABEL: } + +void test() { + C c; + g(&c); +} +} // test4 + +namespace test5 { + +struct __declspec(novtable) S { + virtual void foo(); +}; + +void g(S &s) { s.foo(); } + +// if struct has novtable specifier, then we can't generate assumes +// CHECK-MS-LABEL: define void @"\01?test@test5@@YAXXZ"() +// CHECK-MS: call x86_thiscallcc %"struct.test5::S"* @"\01??0S@test5@@QAE@XZ"( +// CHECK-MS-NOT: @llvm.assume +// CHECK-MS-LABEL: } + +void test() { + S s; + g(s); +} + +} // test5 |