[llvm-branch-commits] [clang] [clang] Implement function pointer signing and authenticated function calls (PR #93906)
via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Mon Jun 3 10:31:47 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-x86
Author: Ahmed Bougacha (ahmedbougacha)
<details>
<summary>Changes</summary>
The functions are currently always signed/authenticated with zero discriminator.
Co-Authored-By: John McCall <rjmccall@<!-- -->apple.com>
---
Patch is 37.62 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/93906.diff
24 Files Affected:
- (modified) clang/include/clang/Basic/CodeGenOptions.h (+4)
- (modified) clang/include/clang/Basic/DiagnosticDriverKinds.td (+3)
- (modified) clang/include/clang/Basic/LangOptions.h (+2)
- (modified) clang/include/clang/Basic/PointerAuthOptions.h (+136)
- (modified) clang/include/clang/Frontend/CompilerInvocation.h (+10)
- (modified) clang/lib/CodeGen/CGBuiltin.cpp (+1-2)
- (modified) clang/lib/CodeGen/CGCall.cpp (+3)
- (modified) clang/lib/CodeGen/CGCall.h (+22-6)
- (modified) clang/lib/CodeGen/CGExpr.cpp (+9-8)
- (modified) clang/lib/CodeGen/CGExprConstant.cpp (+18-1)
- (modified) clang/lib/CodeGen/CGPointerAuth.cpp (+51)
- (added) clang/lib/CodeGen/CGPointerAuthInfo.h (+96)
- (modified) clang/lib/CodeGen/CodeGenFunction.cpp (+22)
- (modified) clang/lib/CodeGen/CodeGenFunction.h (+7)
- (modified) clang/lib/CodeGen/CodeGenModule.h (+34)
- (modified) clang/lib/Frontend/CompilerInvocation.cpp (+36)
- (modified) clang/lib/Headers/ptrauth.h (+34)
- (added) clang/test/CodeGen/ptrauth-function-attributes.c (+13)
- (added) clang/test/CodeGen/ptrauth-function-init-fail.c (+5)
- (added) clang/test/CodeGen/ptrauth-function-init.c (+31)
- (added) clang/test/CodeGen/ptrauth-function-lvalue-cast.c (+23)
- (added) clang/test/CodeGen/ptrauth-function.c (+28)
- (added) clang/test/CodeGen/ptrauth-weak_import.c (+10)
- (added) clang/test/CodeGenCXX/ptrauth.cpp (+24)
``````````diff
diff --git a/clang/include/clang/Basic/CodeGenOptions.h b/clang/include/clang/Basic/CodeGenOptions.h
index 9469a424045bb..502722a6ec4eb 100644
--- a/clang/include/clang/Basic/CodeGenOptions.h
+++ b/clang/include/clang/Basic/CodeGenOptions.h
@@ -13,6 +13,7 @@
#ifndef LLVM_CLANG_BASIC_CODEGENOPTIONS_H
#define LLVM_CLANG_BASIC_CODEGENOPTIONS_H
+#include "clang/Basic/PointerAuthOptions.h"
#include "clang/Basic/Sanitizers.h"
#include "clang/Basic/XRayInstr.h"
#include "llvm/ADT/FloatingPointMode.h"
@@ -388,6 +389,9 @@ class CodeGenOptions : public CodeGenOptionsBase {
std::vector<std::string> Reciprocals;
+ /// Configuration for pointer-signing.
+ PointerAuthOptions PointerAuth;
+
/// The preferred width for auto-vectorization transforms. This is intended to
/// override default transforms based on the width of the architected vector
/// registers.
diff --git a/clang/include/clang/Basic/DiagnosticDriverKinds.td b/clang/include/clang/Basic/DiagnosticDriverKinds.td
index 773b234cd68fe..6cbb0c8401c15 100644
--- a/clang/include/clang/Basic/DiagnosticDriverKinds.td
+++ b/clang/include/clang/Basic/DiagnosticDriverKinds.td
@@ -351,6 +351,9 @@ def err_drv_omp_host_ir_file_not_found : Error<
"target regions but cannot be found">;
def err_drv_omp_host_target_not_supported : Error<
"target '%0' is not a supported OpenMP host target">;
+def err_drv_ptrauth_not_supported : Error<
+ "target '%0' does not support native pointer authentication">;
+
def err_drv_expecting_fopenmp_with_fopenmp_targets : Error<
"'-fopenmp-targets' must be used in conjunction with a '-fopenmp' option "
"compatible with offloading; e.g., '-fopenmp=libomp' or '-fopenmp=libiomp5'">;
diff --git a/clang/include/clang/Basic/LangOptions.h b/clang/include/clang/Basic/LangOptions.h
index 75e88afbd9705..5216822e45b1b 100644
--- a/clang/include/clang/Basic/LangOptions.h
+++ b/clang/include/clang/Basic/LangOptions.h
@@ -346,6 +346,8 @@ class LangOptionsBase {
BKey
};
+ using PointerAuthenticationMode = ::clang::PointerAuthenticationMode;
+
enum class ThreadModelKind {
/// POSIX Threads.
POSIX,
diff --git a/clang/include/clang/Basic/PointerAuthOptions.h b/clang/include/clang/Basic/PointerAuthOptions.h
index e5cdcc31ebfb7..32b179e3f9460 100644
--- a/clang/include/clang/Basic/PointerAuthOptions.h
+++ b/clang/include/clang/Basic/PointerAuthOptions.h
@@ -14,10 +14,146 @@
#ifndef LLVM_CLANG_BASIC_POINTERAUTHOPTIONS_H
#define LLVM_CLANG_BASIC_POINTERAUTHOPTIONS_H
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/LangOptions.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Target/TargetOptions.h"
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
namespace clang {
constexpr unsigned PointerAuthKeyNone = -1;
+class PointerAuthSchema {
+public:
+ enum class Kind : unsigned {
+ None,
+ ARM8_3,
+ };
+
+ /// Hardware pointer-signing keys in ARM8.3.
+ ///
+ /// These values are the same used in ptrauth.h.
+ enum class ARM8_3Key : unsigned {
+ ASIA = 0,
+ ASIB = 1,
+ ASDA = 2,
+ ASDB = 3
+ };
+
+ /// Forms of extra discrimination.
+ enum class Discrimination : unsigned {
+ /// No additional discrimination.
+ None,
+
+ /// Discriminate using a constant value.
+ Constant,
+ };
+
+private:
+ Kind TheKind : 2;
+ unsigned IsAddressDiscriminated : 1;
+ unsigned IsIsaPointer : 1;
+ unsigned AuthenticatesNullValues : 1;
+ PointerAuthenticationMode SelectedAuthenticationMode : 2;
+ Discrimination DiscriminationKind : 2;
+ unsigned Key : 4;
+ unsigned ConstantDiscriminator : 16;
+
+public:
+ PointerAuthSchema() : TheKind(Kind::None) {}
+
+ PointerAuthSchema(
+ ARM8_3Key Key, bool IsAddressDiscriminated,
+ PointerAuthenticationMode AuthenticationMode,
+ Discrimination OtherDiscrimination,
+ std::optional<uint16_t> ConstantDiscriminatorOrNone = std::nullopt,
+ bool IsIsaPointer = false, bool AuthenticatesNullValues = false)
+ : TheKind(Kind::ARM8_3), IsAddressDiscriminated(IsAddressDiscriminated),
+ IsIsaPointer(IsIsaPointer),
+ AuthenticatesNullValues(AuthenticatesNullValues),
+ SelectedAuthenticationMode(AuthenticationMode),
+ DiscriminationKind(OtherDiscrimination), Key(unsigned(Key)) {
+ assert((getOtherDiscrimination() != Discrimination::Constant ||
+ ConstantDiscriminatorOrNone) &&
+ "constant discrimination requires a constant!");
+ if (ConstantDiscriminatorOrNone)
+ ConstantDiscriminator = *ConstantDiscriminatorOrNone;
+ }
+
+ PointerAuthSchema(
+ ARM8_3Key Key, bool IsAddressDiscriminated,
+ Discrimination OtherDiscrimination,
+ std::optional<uint16_t> ConstantDiscriminatorOrNone = std::nullopt,
+ bool IsIsaPointer = false, bool AuthenticatesNullValues = false)
+ : PointerAuthSchema(Key, IsAddressDiscriminated,
+ PointerAuthenticationMode::SignAndAuth,
+ OtherDiscrimination, ConstantDiscriminatorOrNone,
+ IsIsaPointer, AuthenticatesNullValues) {}
+
+ Kind getKind() const { return TheKind; }
+
+ explicit operator bool() const { return isEnabled(); }
+
+ bool isEnabled() const { return getKind() != Kind::None; }
+
+ bool isAddressDiscriminated() const {
+ assert(getKind() != Kind::None);
+ return IsAddressDiscriminated;
+ }
+
+ bool isIsaPointer() const {
+ assert(getKind() != Kind::None);
+ return IsIsaPointer;
+ }
+
+ bool authenticatesNullValues() const {
+ assert(getKind() != Kind::None);
+ return AuthenticatesNullValues;
+ }
+
+ bool hasOtherDiscrimination() const {
+ return getOtherDiscrimination() != Discrimination::None;
+ }
+
+ Discrimination getOtherDiscrimination() const {
+ assert(getKind() != Kind::None);
+ return DiscriminationKind;
+ }
+
+ uint16_t getConstantDiscrimination() const {
+ assert(getOtherDiscrimination() == Discrimination::Constant);
+ return (uint16_t)ConstantDiscriminator;
+ }
+
+ unsigned getKey() const {
+ switch (getKind()) {
+ case Kind::None:
+ llvm_unreachable("calling getKey() on disabled schema");
+ case Kind::ARM8_3:
+ return unsigned(getARM8_3Key());
+ }
+ llvm_unreachable("bad key kind");
+ }
+
+ PointerAuthenticationMode getAuthenticationMode() const {
+ return SelectedAuthenticationMode;
+ }
+
+ ARM8_3Key getARM8_3Key() const {
+ assert(getKind() == Kind::ARM8_3);
+ return ARM8_3Key(Key);
+ }
+};
+
+struct PointerAuthOptions {
+ /// The ABI for C function pointers.
+ PointerAuthSchema FunctionPointers;
+};
+
} // end namespace clang
#endif
diff --git a/clang/include/clang/Frontend/CompilerInvocation.h b/clang/include/clang/Frontend/CompilerInvocation.h
index 1a2a39411e58d..e60e5aad6c70d 100644
--- a/clang/include/clang/Frontend/CompilerInvocation.h
+++ b/clang/include/clang/Frontend/CompilerInvocation.h
@@ -305,6 +305,16 @@ class CompilerInvocation : public CompilerInvocationBase {
/// executable), for finding the builtin compiler path.
static std::string GetResourcesPath(const char *Argv0, void *MainAddr);
+ /// Populate \p Opts with the default set of pointer authentication-related
+ /// options given \p LangOpts and \p Triple. Return true if defaults are
+ /// available.
+ ///
+ /// Note: This is intended to be used by tools which must be aware of
+ /// pointer authentication-related code generation, e.g. lldb.
+ static bool setDefaultPointerAuthOptions(PointerAuthOptions &Opts,
+ const LangOptions &LangOpts,
+ const llvm::Triple &Triple);
+
/// Retrieve a module hash string that is suitable for uniquely
/// identifying the conditions under which the module was built.
std::string getModuleHash() const;
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index b2e3b6fa64284..1f528f9490cd2 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -5999,8 +5999,7 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
// If this is a predefined lib function (e.g. malloc), emit the call
// using exactly the normal call path.
if (getContext().BuiltinInfo.isPredefinedLibFunction(BuiltinID))
- return emitLibraryCall(
- *this, FD, E, cast<llvm::Constant>(EmitScalarExpr(E->getCallee())));
+ return emitLibraryCall(*this, FD, E, CGM.getRawFunctionPointer(FD));
// Check that a call to a target specific builtin has the correct target
// features.
diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index 97449a5e51e73..c33f37bf5b8c4 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -5677,6 +5677,9 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
!isa_and_nonnull<FunctionDecl>(TargetDecl))
EmitKCFIOperandBundle(ConcreteCallee, BundleList);
+ // Add the pointer-authentication bundle.
+ EmitPointerAuthOperandBundle(ConcreteCallee.getPointerAuthInfo(), BundleList);
+
if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(CurFuncDecl))
if (FD->hasAttr<StrictFPAttr>())
// All calls within a strictfp function are marked strictfp
diff --git a/clang/lib/CodeGen/CGCall.h b/clang/lib/CodeGen/CGCall.h
index 6b676ac196db2..4b0e1561b4ef5 100644
--- a/clang/lib/CodeGen/CGCall.h
+++ b/clang/lib/CodeGen/CGCall.h
@@ -14,6 +14,7 @@
#ifndef LLVM_CLANG_LIB_CODEGEN_CGCALL_H
#define LLVM_CLANG_LIB_CODEGEN_CGCALL_H
+#include "CGPointerAuthInfo.h"
#include "CGValue.h"
#include "EHScopeStack.h"
#include "clang/AST/ASTFwd.h"
@@ -69,6 +70,10 @@ class CGCallee {
Last = Virtual
};
+ struct OrdinaryInfoStorage {
+ CGCalleeInfo AbstractInfo;
+ CGPointerAuthInfo PointerAuthInfo;
+ };
struct BuiltinInfoStorage {
const FunctionDecl *Decl;
unsigned ID;
@@ -85,7 +90,7 @@ class CGCallee {
SpecialKind KindOrFunctionPointer;
union {
- CGCalleeInfo AbstractInfo;
+ OrdinaryInfoStorage OrdinaryInfo;
BuiltinInfoStorage BuiltinInfo;
PseudoDestructorInfoStorage PseudoDestructorInfo;
VirtualInfoStorage VirtualInfo;
@@ -104,10 +109,13 @@ class CGCallee {
/// Construct a callee. Call this constructor directly when this
/// isn't a direct call.
- CGCallee(const CGCalleeInfo &abstractInfo, llvm::Value *functionPtr)
+ CGCallee(
+ const CGCalleeInfo &abstractInfo, llvm::Value *functionPtr,
+ const CGPointerAuthInfo &pointerAuthInfo = /*FIXME*/ CGPointerAuthInfo())
: KindOrFunctionPointer(
SpecialKind(reinterpret_cast<uintptr_t>(functionPtr))) {
- AbstractInfo = abstractInfo;
+ OrdinaryInfo.AbstractInfo = abstractInfo;
+ OrdinaryInfo.PointerAuthInfo = pointerAuthInfo;
assert(functionPtr && "configuring callee without function pointer");
assert(functionPtr->getType()->isPointerTy());
}
@@ -128,12 +136,12 @@ class CGCallee {
static CGCallee forDirect(llvm::Constant *functionPtr,
const CGCalleeInfo &abstractInfo = CGCalleeInfo()) {
- return CGCallee(abstractInfo, functionPtr);
+ return CGCallee(abstractInfo, functionPtr, CGPointerAuthInfo());
}
static CGCallee forDirect(llvm::FunctionCallee functionPtr,
const CGCalleeInfo &abstractInfo = CGCalleeInfo()) {
- return CGCallee(abstractInfo, functionPtr.getCallee());
+ return CGCallee(abstractInfo, functionPtr.getCallee(), CGPointerAuthInfo());
}
static CGCallee forVirtual(const CallExpr *CE, GlobalDecl MD, Address Addr,
@@ -173,7 +181,11 @@ class CGCallee {
if (isVirtual())
return VirtualInfo.MD;
assert(isOrdinary());
- return AbstractInfo;
+ return OrdinaryInfo.AbstractInfo;
+ }
+ const CGPointerAuthInfo &getPointerAuthInfo() const {
+ assert(isOrdinary());
+ return OrdinaryInfo.PointerAuthInfo;
}
llvm::Value *getFunctionPointer() const {
assert(isOrdinary());
@@ -184,6 +196,10 @@ class CGCallee {
KindOrFunctionPointer =
SpecialKind(reinterpret_cast<uintptr_t>(functionPtr));
}
+ void setPointerAuthInfo(CGPointerAuthInfo pointerAuth) {
+ assert(isOrdinary());
+ OrdinaryInfo.PointerAuthInfo = pointerAuth;
+ }
bool isVirtual() const {
return KindOrFunctionPointer == SpecialKind::Virtual;
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index d6478cc6835d8..152f51f5865e0 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -2850,22 +2850,22 @@ static LValue EmitGlobalVarDeclLValue(CodeGenFunction &CGF,
return LV;
}
-static llvm::Constant *EmitFunctionDeclPointer(CodeGenModule &CGM,
- GlobalDecl GD) {
+llvm::Constant *CodeGenModule::getRawFunctionPointer(GlobalDecl GD,
+ llvm::Type *Ty) {
const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
if (FD->hasAttr<WeakRefAttr>()) {
- ConstantAddress aliasee = CGM.GetWeakRefReference(FD);
+ ConstantAddress aliasee = GetWeakRefReference(FD);
return aliasee.getPointer();
}
- llvm::Constant *V = CGM.GetAddrOfFunction(GD);
+ llvm::Constant *V = GetAddrOfFunction(GD, Ty);
return V;
}
static LValue EmitFunctionDeclLValue(CodeGenFunction &CGF, const Expr *E,
GlobalDecl GD) {
const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
- llvm::Value *V = EmitFunctionDeclPointer(CGF.CGM, GD);
+ llvm::Constant *V = CGF.CGM.getFunctionPointer(GD);
CharUnits Alignment = CGF.getContext().getDeclAlign(FD);
return CGF.MakeAddrLValue(V, E->getType(), Alignment,
AlignmentSource::Decl);
@@ -5501,7 +5501,7 @@ static CGCallee EmitDirectCallee(CodeGenFunction &CGF, GlobalDecl GD) {
// name to make it clear it's not the actual builtin.
if (CGF.CurFn->getName() != FDInlineName &&
OnlyHasInlineBuiltinDeclaration(FD)) {
- llvm::Constant *CalleePtr = EmitFunctionDeclPointer(CGF.CGM, GD);
+ llvm::Constant *CalleePtr = CGF.CGM.getRawFunctionPointer(GD);
llvm::Function *Fn = llvm::cast<llvm::Function>(CalleePtr);
llvm::Module *M = Fn->getParent();
llvm::Function *Clone = M->getFunction(FDInlineName);
@@ -5524,7 +5524,7 @@ static CGCallee EmitDirectCallee(CodeGenFunction &CGF, GlobalDecl GD) {
return CGCallee::forBuiltin(builtinID, FD);
}
- llvm::Constant *CalleePtr = EmitFunctionDeclPointer(CGF.CGM, GD);
+ llvm::Constant *CalleePtr = CGF.CGM.getRawFunctionPointer(GD);
if (CGF.CGM.getLangOpts().CUDA && !CGF.CGM.getLangOpts().CUDAIsDevice &&
FD->hasAttr<CUDAGlobalAttr>())
CalleePtr = CGF.CGM.getCUDARuntime().getKernelStub(
@@ -5581,7 +5581,8 @@ CGCallee CodeGenFunction::EmitCallee(const Expr *E) {
GD = GlobalDecl(VD);
CGCalleeInfo calleeInfo(functionType->getAs<FunctionProtoType>(), GD);
- CGCallee callee(calleeInfo, calleePtr);
+ CGPointerAuthInfo pointerAuth = CGM.getFunctionPointerAuthInfo(functionType);
+ CGCallee callee(calleeInfo, calleePtr, pointerAuth);
return callee;
}
diff --git a/clang/lib/CodeGen/CGExprConstant.cpp b/clang/lib/CodeGen/CGExprConstant.cpp
index de9380c0e63be..bfb545a2fe1f6 100644
--- a/clang/lib/CodeGen/CGExprConstant.cpp
+++ b/clang/lib/CodeGen/CGExprConstant.cpp
@@ -1956,8 +1956,25 @@ ConstantLValueEmitter::tryEmitBase(const APValue::LValueBase &base) {
if (D->hasAttr<WeakRefAttr>())
return CGM.GetWeakRefReference(D).getPointer();
+ auto PtrAuthSign = [&](llvm::Constant *C) {
+ CGPointerAuthInfo AuthInfo = CGM.getFunctionPointerAuthInfo(DestType);
+
+ if (AuthInfo) {
+ if (hasNonZeroOffset())
+ return ConstantLValue(nullptr);
+
+ C = applyOffset(C);
+ C = CGM.getConstantSignedPointer(
+ C, AuthInfo.getKey(), nullptr,
+ cast_or_null<llvm::Constant>(AuthInfo.getDiscriminator()));
+ return ConstantLValue(C, /*applied offset*/ true);
+ }
+
+ return ConstantLValue(C);
+ };
+
if (auto FD = dyn_cast<FunctionDecl>(D))
- return CGM.GetAddrOfFunction(FD);
+ return PtrAuthSign(CGM.getRawFunctionPointer(FD));
if (auto VD = dyn_cast<VarDecl>(D)) {
// We can never refer to a variable with local storage.
diff --git a/clang/lib/CodeGen/CGPointerAuth.cpp b/clang/lib/CodeGen/CGPointerAuth.cpp
index 756c00aa42c8c..adfa721ac89d3 100644
--- a/clang/lib/CodeGen/CGPointerAuth.cpp
+++ b/clang/lib/CodeGen/CGPointerAuth.cpp
@@ -28,6 +28,24 @@
using namespace clang;
using namespace CodeGen;
+/// Return the abstract pointer authentication schema for a pointer to the given
+/// function type.
+CGPointerAuthInfo CodeGenModule::getFunctionPointerAuthInfo(QualType T) {
+ auto &Schema = getCodeGenOpts().PointerAuth.FunctionPointers;
+ if (!Schema)
+ return CGPointerAuthInfo();
+
+ assert(!Schema.isAddressDiscriminated() &&
+ "function pointers cannot use address-specific discrimination");
+
+ assert(!Schema.hasOtherDiscrimination() &&
+ "function pointers don't support any discrimination yet");
+
+ return CGPointerAuthInfo(Schema.getKey(), Schema.getAuthenticationMode(),
+ /*IsaPointer=*/false, /*AuthenticatesNull=*/false,
+ /*Discriminator=*/nullptr);
+}
+
/// Build a signed-pointer "ptrauth" constant.
static llvm::ConstantPtrAuth *
buildConstantAddress(CodeGenModule &CGM, llvm::Constant *pointer, unsigned key,
@@ -75,3 +93,36 @@ CodeGen::getConstantSignedPointer(CodeGenModule &CGM,
return CGM.getConstantSignedPointer(pointer, key, storageAddress,
otherDiscriminator);
}
+
+/// If applicable, sign a given constant function pointer with the ABI rules for
+/// functionType.
+llvm::Constant *CodeGenModule::getFunctionPointer(llvm::Constant *pointer,
+ QualType functionType,
+ GlobalDecl GD) {
+ assert(functionType->isFunctionType() ||
+ functionType->isFunctionReferenceType() ||
+ functionType->isFunctionPointerType());
+
+ if (auto pointerAuth = getFunctionPointerAuthInfo(functionType)) {
+ return getConstantSignedPointer(
+ pointer, pointerAuth.getKey(), nullptr,
+ cast_or_null<llvm::Constant>(pointerAuth.getDiscriminator()));
+ }
+
+ return pointer;
+}
+
+llvm::Constant *CodeGenModule::getFunctionPointer(GlobalDecl GD,
+ llvm::Type *Ty) {
+ const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
+
+ // Annoyingly, K&R functions have prototypes in the clang AST, but
+ // expressions referring to them are unprototyped.
+ QualType FuncType = FD->getType();
+ if (!FD->hasPrototype())
+ if (const auto *Proto = FuncType->getAs<FunctionProtoType>())
+ FuncType = Context.getFunctionNoProtoType(Proto->getReturnType(),
+ Proto->getExtInfo());
+
+ return getFunctionPointer(getRawFunctionPointer(GD, Ty), FuncType, GD);
+}
diff --git a/clang/lib/CodeGen/CGPointerAuthInfo.h b/clang/lib/CodeGen/CGPointerAuthInfo.h
new file mode 100644
index 0000000000000..e870c3145acba
--- /dev/null
+++ b/clang/lib/CodeGen/CGPointerAuthInfo.h
@@ -0,0 +1,96 @@
+//===----- CGPointerAuthInfo.h - -------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Pointer auth info class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_CGPOINTERAUTHINFO_H
+#define LLVM_CLANG_LIB_CODEGEN_CGPOINTERAUTHINFO_H
+
+#include "clang/AST/Type.h"
+#include "llvm/IR/Type.h"
+#include "llvm/IR/Value.h"
+
+namespace clang {
+namespace CodeGen {
+
+class CGPointerAuthInfo {
+private:
+ PointerAuthenticationMode AuthenticationMode : 2;
+ bool IsIsaPointer : 1;
+ bool AuthenticatesNullValues : 1;
+ unsigned Key : 28;
+ llvm::Value *Discriminator;
+
+public:
+ CGPointerAuthInfo()
+ : AuthenticationMode(PointerAuthenticationMode...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/93906
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