Prazek updated this revision to Diff 150735.
Prazek added a comment.
- Fixed templates
Repository:
rL LLVM
https://reviews.llvm.org/D47108
Files:
clang/docs/ClangCommandLineReference.rst
clang/docs/ReleaseNotes.rst
clang/docs/UsersManual.rst
clang/include/clang/Basic/LangOptions.def
clang/include/clang/Driver/Options.td
clang/include/clang/Frontend/CodeGenOptions.def
clang/lib/CodeGen/ItaniumCXXABI.cpp
clang/lib/Driver/ToolChains/Clang.cpp
clang/lib/Frontend/CompilerInvocation.cpp
clang/lib/Sema/SemaDeclCXX.cpp
clang/test/CodeGenCXX/vtable-available-externally.cpp
Index: clang/test/CodeGenCXX/vtable-available-externally.cpp
===================================================================
--- clang/test/CodeGenCXX/vtable-available-externally.cpp
+++ clang/test/CodeGenCXX/vtable-available-externally.cpp
@@ -1,5 +1,6 @@
// RUN: %clang_cc1 %s -I%S -triple=x86_64-apple-darwin10 -std=c++98 -emit-llvm -o %t
// RUN: %clang_cc1 %s -I%S -triple=x86_64-apple-darwin10 -std=c++98 -O2 -disable-llvm-passes -emit-llvm -o %t.opt
+// RUN: %clang_cc1 %s -I%S -triple=x86_64-apple-darwin10 -std=c++98 -O2 -disable-llvm-passes -emit-llvm -o %t.vtable -fforce-emit-vtables -fstrict-vtable-pointers -mconstructor-aliases
// RUN: FileCheck --check-prefix=CHECK-TEST1 %s < %t
// RUN: FileCheck --check-prefix=CHECK-TEST2 %s < %t
// RUN: FileCheck --check-prefix=CHECK-TEST5 %s < %t
@@ -13,10 +14,13 @@
// RUN: FileCheck --check-prefix=CHECK-TEST15 %s < %t.opt
// RUN: FileCheck --check-prefix=CHECK-TEST16 %s < %t.opt
// RUN: FileCheck --check-prefix=CHECK-TEST17 %s < %t.opt
+// RUN: FileCheck --check-prefix=CHECK-FORCE-EMIT %s < %t.vtable
+
#include <typeinfo>
// CHECK-TEST1: @_ZTVN5Test11AE = external unnamed_addr constant
+// CHECK-FORCE-EMIT-DAG: @_ZTVN5Test11AE = available_externally unnamed_addr constant
namespace Test1 {
struct A {
@@ -213,14 +217,16 @@
// because A's key function is defined here, vtable is generated in this TU
// CHECK-TEST10-DAG: @_ZTVN6Test101AE = unnamed_addr constant
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test101AE = unnamed_addr constant
struct A {
virtual void foo();
virtual void bar();
};
void A::foo() {}
// Because key function is inline we will generate vtable as linkonce_odr.
// CHECK-TEST10-DAG: @_ZTVN6Test101DE = linkonce_odr unnamed_addr constant
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test101DE = linkonce_odr unnamed_addr constant
struct D : A {
void bar();
};
@@ -237,14 +243,17 @@
// can't guarantee that we will be able to refer to bar from name
// so (at the moment) we can't emit vtable available_externally.
// CHECK-TEST10-DAG: @_ZTVN6Test101CE = external unnamed_addr constant
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test101CE = available_externally unnamed_addr constant
struct C : A {
void bar() {} // defined in body - not key function
virtual inline void gar(); // inline in body - not key function
virtual void car();
};
// no key function, vtable will be generated everywhere it will be used
// CHECK-TEST10-DAG: @_ZTVN6Test101EE = linkonce_odr unnamed_addr constant
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test101EE = linkonce_odr unnamed_addr constant
+
struct E : A {};
void g(A& a) {
@@ -298,11 +307,13 @@
namespace Test12 {
// CHECK-TEST12: @_ZTVN6Test121AE = external unnamed_addr constant
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test121AE = available_externally unnamed_addr constant
struct A {
virtual void foo();
virtual ~A() {}
};
// CHECK-TEST12: @_ZTVN6Test121BE = external unnamed_addr constant
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test121BE = available_externally unnamed_addr constant
struct B : A {
void foo();
};
@@ -319,6 +330,9 @@
// CHECK-TEST13-DAG: @_ZTVN6Test131AE = available_externally unnamed_addr constant
// CHECK-TEST13-DAG: @_ZTVN6Test131BE = external unnamed_addr constant
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test131AE = available_externally unnamed_addr constant
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test131BE = available_externally unnamed_addr constant
+
struct A {
virtual ~A();
};
@@ -371,6 +385,8 @@
// generate available_externally vtable for it.
// CHECK-TEST16-DAG: @_ZTVN6Test161SE = external unnamed_addr constant
// CHECK-TEST16-DAG: @_ZTVN6Test162S2E = available_externally
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test161SE = external unnamed_addr constant
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test162S2E = available_externally
struct S {
__attribute__((visibility("hidden"))) virtual void doStuff();
@@ -395,6 +411,10 @@
// This test checks if we emit vtables opportunistically.
// CHECK-TEST17-DAG: @_ZTVN6Test171AE = available_externally
// CHECK-TEST17-DAG: @_ZTVN6Test171BE = external
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test171AE = available_externally
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test171BE = available_externally
+// CHECK-FORCE-EMIT-DAG: define linkonce_odr void @_ZN6Test171BD2Ev(
+// CHECK-FORCE-EMIT-DAG: define linkonce_odr void @_ZN6Test171BD0Ev(
struct A {
virtual void key();
@@ -418,3 +438,111 @@
}
} // namespace Test17
+
+namespace Test18 {
+// Here vtable will be only emitted because it is referenced by assume-load
+// after the Derived construction.
+// CHECK-FORCE-EMIT-DAG: @_ZTVN6Test187DerivedE = linkonce_odr unnamed_addr constant {{.*}} @_ZTIN6Test187DerivedE {{.*}} @_ZN6Test184Base3funEv {{.*}} @_ZN6Test184BaseD2Ev {{.*}} @_ZN6Test187DerivedD0Ev
+// CHECK-FORCE-EMIT-DAG: define linkonce_odr void @_ZN6Test187DerivedD0Ev
+// CHECK-FORCE-EMIT-DAG: define linkonce_odr void @_ZN6Test184BaseD2Ev
+// CHECK-FORCE-EMIT-DAG: define linkonce_odr i32 @_ZN6Test184Base3funEv
+// CHECK-FORCE-EMIT-DAG: @_ZTIN6Test187DerivedE = linkonce_odr constant
+
+struct Base {
+ virtual int fun() { return 42; }
+ virtual ~Base() { }
+};
+
+struct Derived : Base {
+ Derived();
+};
+
+int foo() {
+ Derived *der = new Derived();
+ return der->fun();
+}
+}
+
+namespace TestTemplates {
+
+// CHECK-FORCE-EMIT-DAG: @_ZTVN13TestTemplates8TemplateIiEE = linkonce_odr unnamed_addr constant {{.*}} @_ZTIN13TestTemplates8TemplateIiEE {{.*}} @_ZN13TestTemplates8TemplateIiE3fooEi {{.*}}@_ZN13TestTemplates8TemplateIiE22thisShouldBeEmittedTooEi {{.*}}@_ZN13TestTemplates8TemplateIiED1Ev {{.*}}@_ZN13TestTemplates8TemplateIiED0Ev
+// CHECK-FORCE-EMIT-DAG: define linkonce_odr i32 @_ZN13TestTemplates8TemplateIiE22thisShouldBeEmittedTooEi
+
+template<class T>
+struct Template {
+ Template();
+ virtual T foo(T val);
+ // CHECK-FORCE-EMIT-DAG: define linkonce_odr i32 @_ZN13TestTemplates8TemplateIiE22thisShouldBeEmittedTooEi
+ virtual T thisShouldBeEmittedToo(T val) { return val; }
+ virtual ~Template();
+};
+
+
+struct NonTemplate {
+ typedef int T;
+ NonTemplate();
+ virtual T foo(T val);
+ // CHECK-FORCE-EMIT-DAG: define linkonce_odr i32 @_ZN13TestTemplates11NonTemplate22thisShouldBeEmittedTooEi
+ virtual T thisShouldBeEmittedToo(T val) { return val; }
+ virtual ~NonTemplate();
+};
+
+// CHECK-FORCE-EMIT-DAG: @_ZTVN13TestTemplates16OuterNonTemplate27NestedTemplateInNonTemplateIiEE = linkonce_odr {{.*}} @_ZTIN13TestTemplates16OuterNonTemplate27NestedTemplateInNonTemplateIiEE {{.*}} @_ZN13TestTemplates16OuterNonTemplate27NestedTemplateInNonTemplateIiE3fooEi {{.*}} @_ZN13TestTemplates16OuterNonTemplate27NestedTemplateInNonTemplateIiE22thisShouldBeEmittedTooEi {{.*}} @_ZN13TestTemplates16OuterNonTemplate27NestedTemplateInNonTemplateIiED1Ev {{.*}} @_ZN13TestTemplates16OuterNonTemplate27NestedTemplateInNonTemplateIiED0Ev
+
+struct OuterNonTemplate {
+ template<class T>
+ struct NestedTemplateInNonTemplate {
+ NestedTemplateInNonTemplate();
+ virtual T foo(T val);
+ // CHECK-FORCE-EMIT-DAG: define linkonce_odr i32 @_ZN13TestTemplates16OuterNonTemplate27NestedTemplateInNonTemplateIiE22thisShouldBeEmittedTooEi
+ virtual T thisShouldBeEmittedToo(T val) { return val; }
+ virtual ~NestedTemplateInNonTemplate();
+ };
+
+ struct NestedNonTemplateInNonTemplate {
+ typedef int T;
+ NestedNonTemplateInNonTemplate();
+ virtual T foo(T val);
+ // CHECK-FORCE-EMIT-DAG: define linkonce_odr i32 @_ZN13TestTemplates16OuterNonTemplate30NestedNonTemplateInNonTemplate22thisShouldBeEmittedTooEi
+ virtual T thisShouldBeEmittedToo(T val) { return val; }
+ virtual ~NestedNonTemplateInNonTemplate();
+ };
+};
+
+template<class>
+struct OuterTemplate {
+ template<class T>
+ struct NestedTemplateInTemplate {
+ NestedTemplateInTemplate();
+ virtual T foo(T val);
+ // CHECK-FORCE-EMIT-DAG: define linkonce_odr i32 @_ZN13TestTemplates13OuterTemplateIlE24NestedTemplateInTemplateIiE22thisShouldBeEmittedTooEi
+ virtual T thisShouldBeEmittedToo(T val) { return val; }
+ virtual ~NestedTemplateInTemplate();
+ };
+
+ struct NestedNonTemplateInTemplate {
+ typedef int T;
+ NestedNonTemplateInTemplate();
+ virtual T foo(T val);
+ // CHECK-FORCE-EMIT-DAG: define linkonce_odr i32 @_ZN13TestTemplates13OuterTemplateIlE27NestedNonTemplateInTemplate22thisShouldBeEmittedTooEi
+ virtual T thisShouldBeEmittedToo(T val) { return val; }
+ virtual ~NestedNonTemplateInTemplate();
+ };
+};
+
+template<class T>
+int use() {
+ T *ptr = new T();
+ return ptr->foo(42);
+}
+
+void test() {
+ use<Template<int> >();
+ use<OuterTemplate<long>::NestedTemplateInTemplate<int> >();
+ use<OuterNonTemplate::NestedTemplateInNonTemplate<int> >();
+
+ use<NonTemplate>();
+ use<OuterTemplate<long>::NestedNonTemplateInTemplate>();
+ use<OuterNonTemplate::NestedNonTemplateInNonTemplate>();
+}
+}
Index: clang/lib/Sema/SemaDeclCXX.cpp
===================================================================
--- clang/lib/Sema/SemaDeclCXX.cpp
+++ clang/lib/Sema/SemaDeclCXX.cpp
@@ -6101,6 +6101,12 @@
Record->setParamDestroyedInCallee(true);
else if (Record->hasNonTrivialDestructor())
Record->setParamDestroyedInCallee(CanPass);
+
+ if (getLangOpts().ForceEmitVTables) {
+ // If we want to emit all the vtables, we need to mark it as used. This
+ // is especially required for cases like vtable assumption loads.
+ MarkVTableUsed(Record->getInnerLocStart(), Record);
+ }
}
/// Look up the special member function that would be called by a special
Index: clang/lib/Frontend/CompilerInvocation.cpp
===================================================================
--- clang/lib/Frontend/CompilerInvocation.cpp
+++ clang/lib/Frontend/CompilerInvocation.cpp
@@ -719,6 +719,7 @@
Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
Opts.StrictReturn = !Args.hasArg(OPT_fno_strict_return);
Opts.StrictVTablePointers = Args.hasArg(OPT_fstrict_vtable_pointers);
+ Opts.ForceEmitVTables = Args.hasArg(OPT_fforce_emit_vtables);
Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
Args.hasArg(OPT_cl_fast_relaxed_math);
@@ -2721,6 +2722,9 @@
Args.getAllArgValues(OPT_fxray_never_instrument);
Opts.XRayAttrListFiles = Args.getAllArgValues(OPT_fxray_attr_list);
+ // -fforce-emit-vtables
+ Opts.ForceEmitVTables = Args.hasArg(OPT_fforce_emit_vtables);
+
// -fallow-editor-placeholders
Opts.AllowEditorPlaceholders = Args.hasArg(OPT_fallow_editor_placeholders);
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -3472,6 +3472,10 @@
options::OPT_fno_strict_vtable_pointers,
false))
CmdArgs.push_back("-fstrict-vtable-pointers");
+ if (Args.hasFlag(options::OPT_fforce_emit_vtables,
+ options::OPT_fno_force_emit_vtables,
+ false))
+ CmdArgs.push_back("-fforce-emit-vtables");
if (!Args.hasFlag(options::OPT_foptimize_sibling_calls,
options::OPT_fno_optimize_sibling_calls))
CmdArgs.push_back("-mdisable-tail-calls");
Index: clang/lib/CodeGen/ItaniumCXXABI.cpp
===================================================================
--- clang/lib/CodeGen/ItaniumCXXABI.cpp
+++ clang/lib/CodeGen/ItaniumCXXABI.cpp
@@ -1706,11 +1706,19 @@
if (CGM.getLangOpts().AppleKext)
return false;
- // If we don't have any not emitted inline virtual function, and if vtable is
- // not hidden, then we are safe to emit available_externally copy of vtable.
+ // If the vtable is hidden then it is not safe to emit an available_externally
+ // copy of vtable.
+ if (isVTableHidden(RD))
+ return false;
+
+ if (CGM.getCodeGenOpts().ForceEmitVTables)
+ return true;
+
+ // If we don't have any not emitted inline virtual function then we are safe
+ // to emit an available_externally copy of vtable.
// FIXME we can still emit a copy of the vtable if we
// can emit definition of the inline functions.
- return !hasAnyUnusedVirtualInlineFunction(RD) && !isVTableHidden(RD);
+ return !hasAnyUnusedVirtualInlineFunction(RD);
}
static llvm::Value *performTypeAdjustment(CodeGenFunction &CGF,
Address InitialPtr,
Index: clang/include/clang/Frontend/CodeGenOptions.def
===================================================================
--- clang/include/clang/Frontend/CodeGenOptions.def
+++ clang/include/clang/Frontend/CodeGenOptions.def
@@ -332,6 +332,10 @@
/// Whether to embed source in DWARF debug line section.
CODEGENOPT(EmbedSource, 1, 0)
+/// Whether to emit all vtables
+CODEGENOPT(ForceEmitVTables, 1, 0)
+
+
#undef CODEGENOPT
#undef ENUM_CODEGENOPT
#undef VALUE_CODEGENOPT
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -1669,6 +1669,11 @@
HelpText<"Enables whole-program vtable optimization. Requires -flto">;
def fno_whole_program_vtables : Flag<["-"], "fno-whole-program-vtables">, Group<f_Group>,
Flags<[CoreOption]>;
+def fforce_emit_vtables : Flag<["-"], "fforce-emit-vtables">, Group<f_Group>,
+ Flags<[CC1Option]>,
+ HelpText<"Emits more virtual tables to improve devirtualization">;
+def fno_force_emit_vtables : Flag<["-"], "fno-force-emit-vtables">, Group<f_Group>,
+ Flags<[CoreOption]>;
def fwrapv : Flag<["-"], "fwrapv">, Group<f_Group>, Flags<[CC1Option]>,
HelpText<"Treat signed integer overflow as two's complement">;
def fwritable_strings : Flag<["-"], "fwritable-strings">, Group<f_Group>, Flags<[CC1Option]>,
Index: clang/include/clang/Basic/LangOptions.def
===================================================================
--- clang/include/clang/Basic/LangOptions.def
+++ clang/include/clang/Basic/LangOptions.def
@@ -289,6 +289,9 @@
"controls whether to always emit intrinsic calls to "
"__xray_typedevent(...) builtin.")
+BENIGN_LANGOPT(ForceEmitVTables, 1, 0,
+ "whether to emit all vtables")
+
BENIGN_LANGOPT(AllowEditorPlaceholders, 1, 0,
"allow editor placeholders in source")
Index: clang/docs/UsersManual.rst
===================================================================
--- clang/docs/UsersManual.rst
+++ clang/docs/UsersManual.rst
@@ -1269,6 +1269,12 @@
devirtualization and virtual constant propagation, for classes with
:doc:`hidden LTO visibility <LTOVisibility>`. Requires ``-flto``.
+.. option:: -fforce-emit-vtables
+
+ In order to improve devirtualization, forces emitting of vtables even in
+ modules where it isn't necessary. It causes more inline virtual functions
+ to be emitted.
+
.. option:: -fno-assume-sane-operator-new
Don't assume that the C++'s new operator is sane.
Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -112,6 +112,12 @@
'no-strict' option, Clang attempts to match the overflowing behavior of the
target's native float-to-int conversion instructions.
+- :option: `-fforce-emit-vtables` and `-fno-force-emit-vtables`.
+
+ In order to improve devirtualization, forces emitting of vtables even in
+ modules where it isn't necessary. It causes more inline virtual functions
+ to be emitted.
+
- ...
Deprecated Compiler Flags
Index: clang/docs/ClangCommandLineReference.rst
===================================================================
--- clang/docs/ClangCommandLineReference.rst
+++ clang/docs/ClangCommandLineReference.rst
@@ -1934,6 +1934,12 @@
Enables whole-program vtable optimization. Requires -flto
+.. option:: -fforce-emit-vtables, -fno-force-emit-vtables
+
+In order to improve devirtualization, forces emitting of vtables even in
+modules where it isn't necessary. It causes more inline virtual functions
+to be emitted.
+
.. option:: -fwrapv, -fno-wrapv
Treat signed integer overflow as two's complement
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