llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT--> @llvm/pr-subscribers-clang-codegen Author: Oliver Hunt (ojhunt) <details> <summary>Changes</summary> With pointer authentication it becomes non-trivial to correctly load the vtable pointer of a polymorphic object. __builtin_get_vtable_pointer is a function that performs the load and performs the appropriate authentication operations if necessary. --- Patch is 30.42 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/139790.diff 8 Files Affected: - (modified) clang/docs/LanguageExtensions.rst (+33) - (modified) clang/docs/ReleaseNotes.rst (+2) - (modified) clang/include/clang/Basic/Builtins.td (+6) - (modified) clang/include/clang/Basic/DiagnosticSemaKinds.td (+8) - (modified) clang/lib/CodeGen/CGBuiltin.cpp (+13) - (modified) clang/lib/Sema/SemaChecking.cpp (+37) - (added) clang/test/CodeGenCXX/builtin-get-vtable-pointer.cpp (+304) - (added) clang/test/SemaCXX/builtin-get-vtable-pointer.cpp (+123) ``````````diff diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst index f56f2a640bb36..5561bfb944713 100644 --- a/clang/docs/LanguageExtensions.rst +++ b/clang/docs/LanguageExtensions.rst @@ -3062,6 +3062,39 @@ following way: Query for this feature with ``__has_builtin(__builtin_offsetof)``. +``__builtin_get_vtable_pointer`` +-------------------------------- + +``__builtin_get_vtable_pointer`` loads and authenticates the primary vtable +pointer from an instance of a polymorphic C++ class. + +**Syntax**: + +.. code-block:: c++ + + __builtin_get_vtable_pointer(PolymorphicClass*) + +**Example of Use**: + +.. code-block:: c++ + + struct PolymorphicClass { + virtual ~PolymorphicClass(); + }; + + PolymorphicClass anInstance; + const void* vtablePointer = __builtin_get_vtable_pointer(&anInstance); + +**Description**: + +The ``__builtin_get_vtable_pointer`` builtin loads the primary vtable +pointer from a polymorphic C++ type. If the target platform authenticates +vtable pointers, this builtin will perform the authentication and produce +the underlying raw pointer. The object being queried must be polymorphic, +and so must also be a complete type. + +Query for this feature with ``__has_builtin(__builtin_get_vtable_pointer)``. + ``__builtin_call_with_static_chain`` ------------------------------------ diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index bc13d02e2d20b..342771ca83608 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -291,6 +291,8 @@ Non-comprehensive list of changes in this release different than before. - Fixed a crash when a VLA with an invalid size expression was used within a ``sizeof`` or ``typeof`` expression. (#GH138444) +- Added `__builtin_get_vtable_pointer` to directly load the primary vtable pointer from a + polymorphic object. New Compiler Flags ------------------ diff --git a/clang/include/clang/Basic/Builtins.td b/clang/include/clang/Basic/Builtins.td index 11b1e247237a7..52c0515d4e1b5 100644 --- a/clang/include/clang/Basic/Builtins.td +++ b/clang/include/clang/Basic/Builtins.td @@ -970,6 +970,12 @@ def IsWithinLifetime : LangBuiltin<"CXX_LANG"> { let Prototype = "bool(void*)"; } +def GetVtablePointer : LangBuiltin<"CXX_LANG"> { + let Spellings = ["__builtin_get_vtable_pointer"]; + let Attributes = [CustomTypeChecking, NoThrow, Const]; + let Prototype = "void*(void*)"; +} + // GCC exception builtins def EHReturn : Builtin { let Spellings = ["__builtin_eh_return"]; diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td index 3efe9593b8633..a54eb924ad5bf 100644 --- a/clang/include/clang/Basic/DiagnosticSemaKinds.td +++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td @@ -12729,6 +12729,14 @@ def err_bit_cast_non_trivially_copyable : Error< def err_bit_cast_type_size_mismatch : Error< "size of '__builtin_bit_cast' source type %0 does not match destination type %1 (%2 vs %3 bytes)">; +def err_get_vtable_pointer_incorrect_type + : Error<"__builtin_get_vtable_pointer requires an argument of%select{| " + "polymorphic}0 class pointer type" + ", but %1 %select{was provided|has no virtual methods}0">; +def err_get_vtable_pointer_requires_complete_type + : Error<"__builtin_get_vtable_pointer requires an argument with a complete " + "type, but %0 is incomplete">; + // SYCL-specific diagnostics def warn_sycl_kernel_num_of_template_params : Warning< "'sycl_kernel' attribute only applies to a function template with at least" diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp index 45e0f69c46902..019c70726c267 100644 --- a/clang/lib/CodeGen/CGBuiltin.cpp +++ b/clang/lib/CodeGen/CGBuiltin.cpp @@ -17,6 +17,7 @@ #include "CGDebugInfo.h" #include "CGObjCRuntime.h" #include "CGOpenCLRuntime.h" +#include "CGPointerAuthInfo.h" #include "CGRecordLayout.h" #include "CGValue.h" #include "CodeGenFunction.h" @@ -5365,6 +5366,18 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID, return RValue::get(Result); } + case Builtin::BI__builtin_get_vtable_pointer: { + const Expr *Target = E->getArg(0); + QualType TargetType = Target->getType(); + const CXXRecordDecl *Decl = TargetType->getPointeeCXXRecordDecl(); + assert(Decl); + auto ThisAddress = EmitPointerWithAlignment(Target); + assert(ThisAddress.isValid()); + llvm::Value *VTablePointer = + GetVTablePtr(ThisAddress, Int8PtrTy, Decl, VTableAuthMode::MustTrap); + return RValue::get(VTablePointer); + } + case Builtin::BI__exception_code: case Builtin::BI_exception_code: return RValue::get(EmitSEHExceptionCode()); diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp index 55121b90fa167..39c4fc3fb08e4 100644 --- a/clang/lib/Sema/SemaChecking.cpp +++ b/clang/lib/Sema/SemaChecking.cpp @@ -1825,6 +1825,39 @@ static ExprResult PointerAuthStringDiscriminator(Sema &S, CallExpr *Call) { return Call; } +static ExprResult GetVTablePointer(Sema &S, CallExpr *Call) { + if (S.checkArgCount(Call, 1)) + return ExprError(); + ExprResult ThisArg = S.DefaultFunctionArrayLvalueConversion(Call->getArg(0)); + if (ThisArg.isInvalid()) + return ExprError(); + Call->setArg(0, ThisArg.get()); + const Expr *Subject = Call->getArg(0); + QualType SubjectType = Subject->getType(); + const CXXRecordDecl *SubjectRecord = SubjectType->getPointeeCXXRecordDecl(); + if (!SubjectType->isPointerType() || !SubjectRecord) { + S.Diag(Subject->getBeginLoc(), + diag::err_get_vtable_pointer_incorrect_type) + << 0 << SubjectType; + return ExprError(); + } + if (S.RequireCompleteType( + Subject->getBeginLoc(), SubjectType->getPointeeType(), + diag::err_get_vtable_pointer_requires_complete_type)) { + return ExprError(); + } + + if (!SubjectRecord->isPolymorphic()) { + S.Diag(Subject->getBeginLoc(), + diag::err_get_vtable_pointer_incorrect_type) + << 1 << SubjectRecord; + return ExprError(); + } + QualType ReturnType = S.Context.getPointerType(S.Context.VoidTy.withConst()); + Call->setType(ReturnType); + return Call; +} + static ExprResult BuiltinLaunder(Sema &S, CallExpr *TheCall) { if (S.checkArgCount(TheCall, 1)) return ExprError(); @@ -2719,6 +2752,10 @@ Sema::CheckBuiltinFunctionCall(FunctionDecl *FDecl, unsigned BuiltinID, return PointerAuthAuthAndResign(*this, TheCall); case Builtin::BI__builtin_ptrauth_string_discriminator: return PointerAuthStringDiscriminator(*this, TheCall); + + case Builtin::BI__builtin_get_vtable_pointer: + return GetVTablePointer(*this, TheCall); + // OpenCL v2.0, s6.13.16 - Pipe functions case Builtin::BIread_pipe: case Builtin::BIwrite_pipe: diff --git a/clang/test/CodeGenCXX/builtin-get-vtable-pointer.cpp b/clang/test/CodeGenCXX/builtin-get-vtable-pointer.cpp new file mode 100644 index 0000000000000..5577e01a09f6f --- /dev/null +++ b/clang/test/CodeGenCXX/builtin-get-vtable-pointer.cpp @@ -0,0 +1,304 @@ +// RUN: %clang_cc1 %s -x c++ -std=c++11 -triple x86_64-apple-darwin10 -emit-llvm -O1 -disable-llvm-passes -no-enable-noundef-analysis -o - | FileCheck --check-prefix=CHECK-NOAUTH %s +// RUN: %clang_cc1 %s -x c++ -std=c++11 -triple arm64-apple-ios -fptrauth-calls -fptrauth-vtable-pointer-type-discrimination -emit-llvm -O1 -disable-llvm-passes -no-enable-noundef-analysis -o - | FileCheck --check-prefix=CHECK-TYPEAUTH %s +// RUN: %clang_cc1 %s -x c++ -std=c++11 -triple arm64-apple-ios -fptrauth-calls -fptrauth-vtable-pointer-address-discrimination -emit-llvm -O1 -disable-llvm-passes -no-enable-noundef-analysis -o - | FileCheck --check-prefix=CHECK-ADDRESSAUTH %s +// RUN: %clang_cc1 %s -x c++ -std=c++11 -triple arm64-apple-ios -fptrauth-calls -fptrauth-vtable-pointer-type-discrimination -fptrauth-vtable-pointer-address-discrimination -emit-llvm -O1 -disable-llvm-passes -no-enable-noundef-analysis -o - | FileCheck --check-prefix=CHECK-BOTHAUTH %s +// FIXME: Assume load should not require -fstrict-vtable-pointers + +namespace test1 { +struct A { + A(); + virtual void bar(); +}; + +struct B : A { + B(); + virtual void foo(); +}; + +struct Z : A {}; +struct C : Z, B { + C(); + virtual void wibble(); +}; + +struct D : virtual A { +}; + +struct E : D, B { +}; + +const void *a(A *o) { + // CHECK-NOAUTH: define ptr @_ZN5test11aEPNS_1AE(ptr %o) #0 { + // CHECK-TYPEAUTH: define ptr @_ZN5test11aEPNS_1AE(ptr %o) #0 { + return __builtin_get_vtable_pointer(o); + // CHECK-NOAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %0 = load ptr, ptr %o.addr, align 8 + // CHECK-TYPEAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %1 = ptrtoint ptr %vtable to i64 + // CHECK-TYPEAUTH: %2 = call i64 @llvm.ptrauth.auth(i64 %1, i32 2, i64 48388) + // CHECK-TYPEAUTH: %3 = inttoptr i64 %2 to ptr + // CHECK-TYPEAUTH: %4 = load volatile i8, ptr %3, align 8 + // CHECK-ADDRESSAUTH: %2 = ptrtoint ptr %vtable to i64 + // CHECK-ADDRESSAUTH: %3 = call i64 @llvm.ptrauth.auth(i64 %2, i32 2, i64 %1) + // CHECK-ADDRESSAUTH: %4 = inttoptr i64 %3 to ptr + // CHECK-ADDRESSAUTH: %5 = load volatile i8, ptr %4, align 8 + // CHECK-BOTHAUTH: [[T1:%.*]] = ptrtoint ptr %0 to i64 + // CHECK-BOTHAUTH: [[T2:%.*]] = call i64 @llvm.ptrauth.blend(i64 [[T1]], i64 48388) + // CHECK-BOTHAUTH: [[T3:%.*]] = ptrtoint ptr %vtable to i64 + // CHECK-BOTHAUTH: [[T4:%.*]] = call i64 @llvm.ptrauth.auth(i64 [[T3]], i32 2, i64 [[T2]]) + // CHECK-BOTHAUTH: [[T5:%.*]] = inttoptr i64 [[T4]] to ptr + // CHECK-BOTHAUTH: [[T6:%.*]] = load volatile i8, ptr [[T5]], align 8 +} + +const void *b(B *o) { + // CHECK-TYPEAUTH: define ptr @_ZN5test11bEPNS_1BE(ptr %o) #0 { + // CHECK-NOAUTH: define ptr @_ZN5test11bEPNS_1BE(ptr %o) #0 { + return __builtin_get_vtable_pointer(o); + // CHECK-NOAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %1 = ptrtoint ptr %vtable to i64 + // CHECK-TYPEAUTH: %2 = call i64 @llvm.ptrauth.auth(i64 %1, i32 2, i64 48388) + // CHECK-TYPEAUTH: %3 = inttoptr i64 %2 to ptr + // CHECK-TYPEAUTH: %4 = load volatile i8, ptr %3, align 8 + // CHECK-ADDRESSAUTH: %2 = ptrtoint ptr %vtable to i64 + // CHECK-ADDRESSAUTH: %3 = call i64 @llvm.ptrauth.auth(i64 %2, i32 2, i64 %1) + // CHECK-ADDRESSAUTH: %4 = inttoptr i64 %3 to ptr + // CHECK-ADDRESSAUTH: %5 = load volatile i8, ptr %4, align 8 + // CHECK-BOTHAUTH: [[T2:%.*]] = call i64 @llvm.ptrauth.blend(i64 %1, i64 48388) + // CHECK-BOTHAUTH: [[T3:%.*]] = ptrtoint ptr %vtable to i64 + // CHECK-BOTHAUTH: [[T4:%.*]] = call i64 @llvm.ptrauth.auth(i64 [[T3]], i32 2, i64 [[T2]]) + // CHECK-BOTHAUTH: [[T5:%.*]] = inttoptr i64 [[T4]] to ptr + // CHECK-BOTHAUTH: [[T6:%.*]] = load volatile i8, ptr [[T5]], align 8 +} + +const void *b_as_A(B *o) { + // CHECK-NOAUTH: define ptr @_ZN5test16b_as_AEPNS_1BE(ptr %o) #0 { + return __builtin_get_vtable_pointer((A *)o); + // CHECK-NOAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %1 = ptrtoint ptr %vtable to i64 + // CHECK-TYPEAUTH: %2 = call i64 @llvm.ptrauth.auth(i64 %1, i32 2, i64 48388) + // CHECK-TYPEAUTH: %3 = inttoptr i64 %2 to ptr + // CHECK-TYPEAUTH: %4 = load volatile i8, ptr %3, align 8 + // CHECK-ADDRESSAUTH: %2 = ptrtoint ptr %vtable to i64 + // CHECK-ADDRESSAUTH: %3 = call i64 @llvm.ptrauth.auth(i64 %2, i32 2, i64 %1) + // CHECK-ADDRESSAUTH: %4 = inttoptr i64 %3 to ptr + // CHECK-ADDRESSAUTH: %5 = load volatile i8, ptr %4, align 8 + // CHECK-BOTHAUTH: [[T2:%.*]] = call i64 @llvm.ptrauth.blend(i64 %1, i64 48388) + // CHECK-BOTHAUTH: [[T3:%.*]] = ptrtoint ptr %vtable to i64 + // CHECK-BOTHAUTH: [[T4:%.*]] = call i64 @llvm.ptrauth.auth(i64 [[T3]], i32 2, i64 [[T2]]) + // CHECK-BOTHAUTH: [[T5:%.*]] = inttoptr i64 [[T4]] to ptr + // CHECK-BOTHAUTH: [[T6:%.*]] = load volatile i8, ptr [[T5]], align 8 +} + +const void *c(C *o) { + // CHECK-NOAUTH: define ptr @_ZN5test11cEPNS_1CE(ptr %o) #0 { + return __builtin_get_vtable_pointer(o); + // CHECK-NOAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %1 = ptrtoint ptr %vtable to i64 + // CHECK-TYPEAUTH: %2 = call i64 @llvm.ptrauth.auth(i64 %1, i32 2, i64 48388) + // CHECK-TYPEAUTH: %3 = inttoptr i64 %2 to ptr + // CHECK-TYPEAUTH: %4 = load volatile i8, ptr %3, align 8 + // CHECK-ADDRESSAUTH: %2 = ptrtoint ptr %vtable to i64 + // CHECK-ADDRESSAUTH: %3 = call i64 @llvm.ptrauth.auth(i64 %2, i32 2, i64 %1) + // CHECK-ADDRESSAUTH: %4 = inttoptr i64 %3 to ptr + // CHECK-ADDRESSAUTH: %5 = load volatile i8, ptr %4, align 8 + // CHECK-BOTHAUTH: [[T2:%.*]] = call i64 @llvm.ptrauth.blend(i64 %1, i64 48388) + // CHECK-BOTHAUTH: [[T3:%.*]] = ptrtoint ptr %vtable to i64 + // CHECK-BOTHAUTH: [[T4:%.*]] = call i64 @llvm.ptrauth.auth(i64 [[T3]], i32 2, i64 [[T2]]) + // CHECK-BOTHAUTH: [[T5:%.*]] = inttoptr i64 [[T4]] to ptr + // CHECK-BOTHAUTH: [[T6:%.*]] = load volatile i8, ptr [[T5]], align 8 +} + +const void *c_as_Z(C *o) { + // CHECK-NOAUTH: define ptr @_ZN5test16c_as_ZEPNS_1CE(ptr %o) #0 { + return __builtin_get_vtable_pointer((Z *)o); + // CHECK-NOAUTH: %0 = load ptr, ptr %o.addr, align 8 + // CHECK-NOAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %1 = ptrtoint ptr %vtable to i64 + // CHECK-TYPEAUTH: %2 = call i64 @llvm.ptrauth.auth(i64 %1, i32 2, i64 48388) + // CHECK-TYPEAUTH: %3 = inttoptr i64 %2 to ptr + // CHECK-TYPEAUTH: %4 = load volatile i8, ptr %3, align 8 + // CHECK-ADDRESSAUTH: %2 = ptrtoint ptr %vtable to i64 + // CHECK-ADDRESSAUTH: %3 = call i64 @llvm.ptrauth.auth(i64 %2, i32 2, i64 %1) + // CHECK-ADDRESSAUTH: %4 = inttoptr i64 %3 to ptr + // CHECK-ADDRESSAUTH: %5 = load volatile i8, ptr %4, align 8 + // CHECK-BOTHAUTH: [[T2:%.*]] = call i64 @llvm.ptrauth.blend(i64 %1, i64 48388) + // CHECK-BOTHAUTH: [[T3:%.*]] = ptrtoint ptr %vtable to i64 + // CHECK-BOTHAUTH: [[T4:%.*]] = call i64 @llvm.ptrauth.auth(i64 [[T3]], i32 2, i64 [[T2]]) + // CHECK-BOTHAUTH: [[T5:%.*]] = inttoptr i64 [[T4]] to ptr + // CHECK-BOTHAUTH: [[T6:%.*]] = load volatile i8, ptr [[T5]], align 8 +} + +const void *c_as_B(C *o) { + // CHECK-NOAUTH: define ptr @_ZN5test16c_as_BEPNS_1CE(ptr %o) #0 { + return __builtin_get_vtable_pointer((B *)o); + // CHECK-NOAUTH: %add.ptr = getelementptr inbounds i8, ptr %0, i64 8 + // CHECK-NOAUTH: br label %cast.end + // CHECK-NOAUTH: %cast.result = phi ptr [ %add.ptr, %cast.notnull ], [ null, %entry ] + // CHECK-NOAUTH: %vtable = load ptr, ptr %cast.result, align 8 + // CHECK-TYPEAUTH: %cast.result = phi ptr [ %add.ptr, %cast.notnull ], [ null, %entry ] + // CHECK-TYPEAUTH: %vtable = load ptr, ptr %cast.result, align 8 + // CHECK-TYPEAUTH: %2 = ptrtoint ptr %vtable to i64 + // CHECK-TYPEAUTH: %3 = call i64 @llvm.ptrauth.auth(i64 %2, i32 2, i64 48388) + // CHECK-TYPEAUTH: %4 = inttoptr i64 %3 to ptr + // CHECK-TYPEAUTH: %5 = load volatile i8, ptr %4, align 8 + // CHECK-ADDRESSAUTH: %2 = ptrtoint ptr %cast.result to i64 + // CHECK-ADDRESSAUTH: %3 = ptrtoint ptr %vtable to i64 + // CHECK-ADDRESSAUTH: %4 = call i64 @llvm.ptrauth.auth(i64 %3, i32 2, i64 %2) + // CHECK-ADDRESSAUTH: %5 = inttoptr i64 %4 to ptr + // CHECK-ADDRESSAUTH: %6 = load volatile i8, ptr %5, align 8 + // CHECK-BOTHAUTH: [[T2:%.*]] = call i64 @llvm.ptrauth.blend(i64 %2, i64 48388) + // CHECK-BOTHAUTH: [[T3:%.*]] = ptrtoint ptr %vtable to i64 + // CHECK-BOTHAUTH: [[T4:%.*]] = call i64 @llvm.ptrauth.auth(i64 [[T3]], i32 2, i64 [[T2]]) + // CHECK-BOTHAUTH: [[T5:%.*]] = inttoptr i64 [[T4]] to ptr + // CHECK-BOTHAUTH: [[T6:%.*]] = load volatile i8, ptr [[T5]], align 8 +} + +const void *d(D *o) { + // CHECK-NOAUTH: define ptr @_ZN5test11dEPNS_1DE(ptr %o) #0 { + return __builtin_get_vtable_pointer(o); + // CHECK-NOAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %1 = ptrtoint ptr %vtable to i64 + // CHECK-TYPEAUTH: %2 = call i64 @llvm.ptrauth.auth(i64 %1, i32 2, i64 48388) + // CHECK-TYPEAUTH: %3 = inttoptr i64 %2 to ptr + // CHECK-TYPEAUTH: %4 = load volatile i8, ptr %3, align 8 + // CHECK-ADDRESSAUTH: %1 = ptrtoint ptr %0 to i64 + // CHECK-ADDRESSAUTH: %2 = ptrtoint ptr %vtable to i64 + // CHECK-ADDRESSAUTH: %3 = call i64 @llvm.ptrauth.auth(i64 %2, i32 2, i64 %1) + // CHECK-ADDRESSAUTH: %4 = inttoptr i64 %3 to ptr + // CHECK-ADDRESSAUTH: %5 = load volatile i8, ptr %4, align 8 + // CHECK-BOTHAUTH: [[T1:%.*]] = ptrtoint ptr %0 to i64 + // CHECK-BOTHAUTH: [[T2:%.*]] = call i64 @llvm.ptrauth.blend(i64 [[T1]], i64 48388) + // CHECK-BOTHAUTH: [[T3:%.*]] = ptrtoint ptr %vtable to i64 + // CHECK-BOTHAUTH: [[T4:%.*]] = call i64 @llvm.ptrauth.auth(i64 [[T3]], i32 2, i64 [[T2]]) + // CHECK-BOTHAUTH: [[T5:%.*]] = inttoptr i64 [[T4]] to ptr + // CHECK-BOTHAUTH: [[T6:%.*]] = load volatile i8, ptr [[T5]], align 8 +} + +const void *d_as_A(D *o) { + // CHECK-NOAUTH: define ptr @_ZN5test16d_as_AEPNS_1DE(ptr %o) #0 { + return __builtin_get_vtable_pointer((A *)o); + // CHECK-NOAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-NOAUTH: %vbase.offset.ptr = getelementptr i8, ptr %vtable, i64 -32 + // CHECK-NOAUTH: %vbase.offset = load i64, ptr %vbase.offset.ptr, align 8 + // CHECK-NOAUTH: %add.ptr = getelementptr inbounds i8, ptr %0, i64 %vbase.offset + // CHECK-NOAUTH: %cast.result = phi ptr [ %add.ptr, %cast.notnull ], [ null, %entry ] + // CHECK-NOAUTH: %vtable1 = load ptr, ptr %cast.result, align 8 + // CHECK-TYPEAUTH: %vtable1 = load ptr, ptr %cast.result, align 8 + // CHECK-TYPEAUTH: %5 = ptrtoint ptr %vtable1 to i64 + // CHECK-TYPEAUTH: %6 = call i64 @llvm.ptrauth.auth(i64 %5, i32 2, i64 48388) + // CHECK-TYPEAUTH: %7 = inttoptr i64 %6 to ptr + // CHECK-TYPEAUTH: %8 = load volatile i8, ptr %7, align 8 + // CHECK-ADDRESSAUTH: %6 = ptrtoint ptr %cast.result to i64 + // CHECK-ADDRESSAUTH: %7 = ptrtoint ptr %vtable1 to i64 + // CHECK-ADDRESSAUTH: %8 = call i64 @llvm.ptrauth.auth(i64 %7, i32 2, i64 %6) + // CHECK-ADDRESSAUTH: %9 = inttoptr i64 %8 to ptr + // CHECK-ADDRESSAUTH: %10 = load volatile i8, ptr %9, align 8 + // CHECK-BOTHAUTH: [[T1:%.*]] = ptrtoint ptr %cast.result to i64 + // CHECK-BOTHAUTH: [[T2:%.*]] = call i64 @llvm.ptrauth.blend(i64 [[T1]], i64 48388) + // CHECK-BOTHAUTH: [[T3:%.*]] = ptrtoint ptr %vtable1 to i64 + // CHECK-BOTHAUTH: [[T4:%.*]] = call i64 @llvm.ptrauth.auth(i64 [[T3]], i32 2, i64 [[T2]]) + // CHECK-BOTHAUTH: [[T5:%.*]] = inttoptr i64 [[T4]] to ptr + // CHECK-BOTHAUTH: [[T6:%.*]] = load volatile i8, ptr [[T5]], align 8 +} + +const void *e(E *o) { + // CHECK-NOAUTH: define ptr @_ZN5test11eEPNS_1EE(ptr %o) #0 { + return __builtin_get_vtable_pointer(o); + // CHECK-NOAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %vtable = load ptr, ptr %0, align 8 + // CHECK-TYPEAUTH: %1 = ptrtoint ptr %vtable to i64 + // CHECK-TYPEAUTH: %2 = call i64 @llvm.ptrauth.auth(i64 %1, i32 2, i64 48388) + // CHECK-TYPEAUTH: %3 = inttoptr i64 %2 to ptr + // CHECK-TYPEAUTH: %4 = load volatile i8, ptr %3, align 8 + // CHECK-ADDRESSAUTH: [[T1:%.*]] = ptrtoint ptr %0 to i64 + // CHECK-ADDRESSAUTH: [[T2:%.*]] = ptrtoint ptr %vtable to i64 + // CHECK-ADDRESSAUTH: [[T3:%.*]] = call i64 @llvm.ptrauth.auth(i64 [[T2]], i32 2, i64 [[T1]]) + // CHECK-ADDRESSAUTH: [[T4:%.*]] = inttoptr i64 [[T3]] to ptr + // CHECK-ADDRESSAUTH: [[T5:%.*]] = load volatile i8, ptr [[T4]], align 8 + // CHECK-BOTHAUTH: [[T1:%.*]] = ptrtoint ptr %0 to i64 + // CHECK-BOTHAUTH: [[T2:%.*]] = call i64 @llvm.ptrauth.blend(i64 [[T1]], i64 48388) + // CHECK-BOTHAUTH: [[T3:%.*]] = ptrtoint ptr %vtable to i64 + // CHECK-BOTHAUTH: [[T4:%.*]] = call i64 @llvm.ptrauth.auth(i64 [[T3]], i32 2, i64 [[T2]]) + // CHECK-BOTHAUTH: [[T5:%.*]] = inttoptr i64 [[T4]] to ptr + // CHECK-BOTHAUTH: [[T6:%.*]] = load volatile i8, ptr [[T5]], align 8 +} + +const void *e_as_B(E *o) { + // CHECK-NOAUTH: define ptr @_ZN5test16e_as_BEPNS_1EE(ptr %o) #0 { + return __builtin_get_vtable_pointer((B *)o); + // CHECK-NOAUTH: %add.ptr = getelementptr inbounds i8, ptr %0, i64 8 + // CHECK-NOAUTH: %cast.result = phi ptr [ %add.ptr, %cast.notnull ], [ null, %entry ] + // CHECK-N... [truncated] `````````` </details> https://github.com/llvm/llvm-project/pull/139790 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
