Export clang-format16 via ydblib project

6e6be3a95868fde888d801b7590af4044049563f

1 files changed, 482 insertions, 0 deletions

diff --git a/contrib/libs/clang16/lib/CodeGen/CGObjCRuntime.cpp b/contrib/libs/clang16/lib/CodeGen/CGObjCRuntime.cpp
new file mode 100644
index 0000000000..9097a8cf70
--- /dev/null
+++ b/contrib/libs/clang16/lib/CodeGen/CGObjCRuntime.cpp
@@ -0,0 +1,482 @@
+//==- CGObjCRuntime.cpp - Interface to Shared Objective-C Runtime Features ==//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This abstract class defines the interface for Objective-C runtime-specific
+// code generation.  It provides some concrete helper methods for functionality
+// shared between all (or most) of the Objective-C runtimes supported by clang.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CGObjCRuntime.h"
+#include "CGCXXABI.h"
+#include "CGCleanup.h"
+#include "CGRecordLayout.h"
+#include "CodeGenFunction.h"
+#include "CodeGenModule.h"
+#include "clang/AST/RecordLayout.h"
+#include "clang/AST/StmtObjC.h"
+#include "clang/CodeGen/CGFunctionInfo.h"
+#include "clang/CodeGen/CodeGenABITypes.h"
+#include "llvm/IR/Instruction.h"
+#include "llvm/Support/SaveAndRestore.h"
+
+using namespace clang;
+using namespace CodeGen;
+
+uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM,
+                                              const ObjCInterfaceDecl *OID,
+                                              const ObjCIvarDecl *Ivar) {
+  return CGM.getContext().lookupFieldBitOffset(OID, nullptr, Ivar) /
+         CGM.getContext().getCharWidth();
+}
+
+uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM,
+                                              const ObjCImplementationDecl *OID,
+                                              const ObjCIvarDecl *Ivar) {
+  return CGM.getContext().lookupFieldBitOffset(OID->getClassInterface(), OID,
+                                               Ivar) /
+         CGM.getContext().getCharWidth();
+}
+
+unsigned CGObjCRuntime::ComputeBitfieldBitOffset(
+    CodeGen::CodeGenModule &CGM,
+    const ObjCInterfaceDecl *ID,
+    const ObjCIvarDecl *Ivar) {
+  return CGM.getContext().lookupFieldBitOffset(ID, ID->getImplementation(),
+                                               Ivar);
+}
+
+LValue CGObjCRuntime::EmitValueForIvarAtOffset(CodeGen::CodeGenFunction &CGF,
+                                               const ObjCInterfaceDecl *OID,
+                                               llvm::Value *BaseValue,
+                                               const ObjCIvarDecl *Ivar,
+                                               unsigned CVRQualifiers,
+                                               llvm::Value *Offset) {
+  // Compute (type*) ( (char *) BaseValue + Offset)
+  QualType InterfaceTy{OID->getTypeForDecl(), 0};
+  QualType ObjectPtrTy =
+      CGF.CGM.getContext().getObjCObjectPointerType(InterfaceTy);
+  QualType IvarTy =
+      Ivar->getUsageType(ObjectPtrTy).withCVRQualifiers(CVRQualifiers);
+  llvm::Type *LTy = CGF.CGM.getTypes().ConvertTypeForMem(IvarTy);
+  llvm::Value *V = CGF.Builder.CreateBitCast(BaseValue, CGF.Int8PtrTy);
+  V = CGF.Builder.CreateInBoundsGEP(CGF.Int8Ty, V, Offset, "add.ptr");
+
+  if (!Ivar->isBitField()) {
+    V = CGF.Builder.CreateBitCast(V, llvm::PointerType::getUnqual(LTy));
+    LValue LV = CGF.MakeNaturalAlignAddrLValue(V, IvarTy);
+    return LV;
+  }
+
+  // We need to compute an access strategy for this bit-field. We are given the
+  // offset to the first byte in the bit-field, the sub-byte offset is taken
+  // from the original layout. We reuse the normal bit-field access strategy by
+  // treating this as an access to a struct where the bit-field is in byte 0,
+  // and adjust the containing type size as appropriate.
+  //
+  // FIXME: Note that currently we make a very conservative estimate of the
+  // alignment of the bit-field, because (a) it is not clear what guarantees the
+  // runtime makes us, and (b) we don't have a way to specify that the struct is
+  // at an alignment plus offset.
+  //
+  // Note, there is a subtle invariant here: we can only call this routine on
+  // non-synthesized ivars but we may be called for synthesized ivars.  However,
+  // a synthesized ivar can never be a bit-field, so this is safe.
+  uint64_t FieldBitOffset =
+      CGF.CGM.getContext().lookupFieldBitOffset(OID, nullptr, Ivar);
+  uint64_t BitOffset = FieldBitOffset % CGF.CGM.getContext().getCharWidth();
+  uint64_t AlignmentBits = CGF.CGM.getTarget().getCharAlign();
+  uint64_t BitFieldSize = Ivar->getBitWidthValue(CGF.getContext());
+  CharUnits StorageSize = CGF.CGM.getContext().toCharUnitsFromBits(
+      llvm::alignTo(BitOffset + BitFieldSize, AlignmentBits));
+  CharUnits Alignment = CGF.CGM.getContext().toCharUnitsFromBits(AlignmentBits);
+
+  // Allocate a new CGBitFieldInfo object to describe this access.
+  //
+  // FIXME: This is incredibly wasteful, these should be uniqued or part of some
+  // layout object. However, this is blocked on other cleanups to the
+  // Objective-C code, so for now we just live with allocating a bunch of these
+  // objects.
+  CGBitFieldInfo *Info = new (CGF.CGM.getContext()) CGBitFieldInfo(
+    CGBitFieldInfo::MakeInfo(CGF.CGM.getTypes(), Ivar, BitOffset, BitFieldSize,
+                             CGF.CGM.getContext().toBits(StorageSize),
+                             CharUnits::fromQuantity(0)));
+
+  Address Addr = Address(V, CGF.Int8Ty, Alignment);
+  Addr = CGF.Builder.CreateElementBitCast(Addr,
+                                   llvm::Type::getIntNTy(CGF.getLLVMContext(),
+                                                         Info->StorageSize));
+  return LValue::MakeBitfield(Addr, *Info, IvarTy,
+                              LValueBaseInfo(AlignmentSource::Decl),
+                              TBAAAccessInfo());
+}
+
+namespace {
+  struct CatchHandler {
+    const VarDecl *Variable;
+    const Stmt *Body;
+    llvm::BasicBlock *Block;
+    llvm::Constant *TypeInfo;
+    /// Flags used to differentiate cleanups and catchalls in Windows SEH
+    unsigned Flags;
+  };
+
+  struct CallObjCEndCatch final : EHScopeStack::Cleanup {
+    CallObjCEndCatch(bool MightThrow, llvm::FunctionCallee Fn)
+        : MightThrow(MightThrow), Fn(Fn) {}
+    bool MightThrow;
+    llvm::FunctionCallee Fn;
+
+    void Emit(CodeGenFunction &CGF, Flags flags) override {
+      if (MightThrow)
+        CGF.EmitRuntimeCallOrInvoke(Fn);
+      else
+        CGF.EmitNounwindRuntimeCall(Fn);
+    }
+  };
+}
+
+void CGObjCRuntime::EmitTryCatchStmt(CodeGenFunction &CGF,
+                                     const ObjCAtTryStmt &S,
+                                     llvm::FunctionCallee beginCatchFn,
+                                     llvm::FunctionCallee endCatchFn,
+                                     llvm::FunctionCallee exceptionRethrowFn) {
+  // Jump destination for falling out of catch bodies.
+  CodeGenFunction::JumpDest Cont;
+  if (S.getNumCatchStmts())
+    Cont = CGF.getJumpDestInCurrentScope("eh.cont");
+
+  bool useFunclets = EHPersonality::get(CGF).usesFuncletPads();
+
+  CodeGenFunction::FinallyInfo FinallyInfo;
+  if (!useFunclets)
+    if (const ObjCAtFinallyStmt *Finally = S.getFinallyStmt())
+      FinallyInfo.enter(CGF, Finally->getFinallyBody(),
+                        beginCatchFn, endCatchFn, exceptionRethrowFn);
+
+  SmallVector<CatchHandler, 8> Handlers;
+
+
+  // Enter the catch, if there is one.
+  if (S.getNumCatchStmts()) {
+    for (const ObjCAtCatchStmt *CatchStmt : S.catch_stmts()) {
+      const VarDecl *CatchDecl = CatchStmt->getCatchParamDecl();
+
+      Handlers.push_back(CatchHandler());
+      CatchHandler &Handler = Handlers.back();
+      Handler.Variable = CatchDecl;
+      Handler.Body = CatchStmt->getCatchBody();
+      Handler.Block = CGF.createBasicBlock("catch");
+      Handler.Flags = 0;
+
+      // @catch(...) always matches.
+      if (!CatchDecl) {
+        auto catchAll = getCatchAllTypeInfo();
+        Handler.TypeInfo = catchAll.RTTI;
+        Handler.Flags = catchAll.Flags;
+        // Don't consider any other catches.
+        break;
+      }
+
+      Handler.TypeInfo = GetEHType(CatchDecl->getType());
+    }
+
+    EHCatchScope *Catch = CGF.EHStack.pushCatch(Handlers.size());
+    for (unsigned I = 0, E = Handlers.size(); I != E; ++I)
+      Catch->setHandler(I, { Handlers[I].TypeInfo, Handlers[I].Flags }, Handlers[I].Block);
+  }
+
+  if (useFunclets)
+    if (const ObjCAtFinallyStmt *Finally = S.getFinallyStmt()) {
+        CodeGenFunction HelperCGF(CGM, /*suppressNewContext=*/true);
+        if (!CGF.CurSEHParent)
+            CGF.CurSEHParent = cast<NamedDecl>(CGF.CurFuncDecl);
+        // Outline the finally block.
+        const Stmt *FinallyBlock = Finally->getFinallyBody();
+        HelperCGF.startOutlinedSEHHelper(CGF, /*isFilter*/false, FinallyBlock);
+
+        // Emit the original filter expression, convert to i32, and return.
+        HelperCGF.EmitStmt(FinallyBlock);
+
+        HelperCGF.FinishFunction(FinallyBlock->getEndLoc());
+
+        llvm::Function *FinallyFunc = HelperCGF.CurFn;
+
+
+        // Push a cleanup for __finally blocks.
+        CGF.pushSEHCleanup(NormalAndEHCleanup, FinallyFunc);
+    }
+
+
+  // Emit the try body.
+  CGF.EmitStmt(S.getTryBody());
+
+  // Leave the try.
+  if (S.getNumCatchStmts())
+    CGF.popCatchScope();
+
+  // Remember where we were.
+  CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveAndClearIP();
+
+  // Emit the handlers.
+  for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
+    CatchHandler &Handler = Handlers[I];
+
+    CGF.EmitBlock(Handler.Block);
+
+    CodeGenFunction::LexicalScope Cleanups(CGF, Handler.Body->getSourceRange());
+    SaveAndRestore RevertAfterScope(CGF.CurrentFuncletPad);
+    if (useFunclets) {
+      llvm::Instruction *CPICandidate = Handler.Block->getFirstNonPHI();
+      if (auto *CPI = dyn_cast_or_null<llvm::CatchPadInst>(CPICandidate)) {
+        CGF.CurrentFuncletPad = CPI;
+        CPI->setOperand(2, CGF.getExceptionSlot().getPointer());
+        CGF.EHStack.pushCleanup<CatchRetScope>(NormalCleanup, CPI);
+      }
+    }
+
+    llvm::Value *RawExn = CGF.getExceptionFromSlot();
+
+    // Enter the catch.
+    llvm::Value *Exn = RawExn;
+    if (beginCatchFn)
+      Exn = CGF.EmitNounwindRuntimeCall(beginCatchFn, RawExn, "exn.adjusted");
+
+    if (endCatchFn) {
+      // Add a cleanup to leave the catch.
+      bool EndCatchMightThrow = (Handler.Variable == nullptr);
+
+      CGF.EHStack.pushCleanup<CallObjCEndCatch>(NormalAndEHCleanup,
+                                                EndCatchMightThrow,
+                                                endCatchFn);
+    }
+
+    // Bind the catch parameter if it exists.
+    if (const VarDecl *CatchParam = Handler.Variable) {
+      llvm::Type *CatchType = CGF.ConvertType(CatchParam->getType());
+      llvm::Value *CastExn = CGF.Builder.CreateBitCast(Exn, CatchType);
+
+      CGF.EmitAutoVarDecl(*CatchParam);
+      EmitInitOfCatchParam(CGF, CastExn, CatchParam);
+    }
+
+    CGF.ObjCEHValueStack.push_back(Exn);
+    CGF.EmitStmt(Handler.Body);
+    CGF.ObjCEHValueStack.pop_back();
+
+    // Leave any cleanups associated with the catch.
+    Cleanups.ForceCleanup();
+
+    CGF.EmitBranchThroughCleanup(Cont);
+  }
+
+  // Go back to the try-statement fallthrough.
+  CGF.Builder.restoreIP(SavedIP);
+
+  // Pop out of the finally.
+  if (!useFunclets && S.getFinallyStmt())
+    FinallyInfo.exit(CGF);
+
+  if (Cont.isValid())
+    CGF.EmitBlock(Cont.getBlock());
+}
+
+void CGObjCRuntime::EmitInitOfCatchParam(CodeGenFunction &CGF,
+                                         llvm::Value *exn,
+                                         const VarDecl *paramDecl) {
+
+  Address paramAddr = CGF.GetAddrOfLocalVar(paramDecl);
+
+  switch (paramDecl->getType().getQualifiers().getObjCLifetime()) {
+  case Qualifiers::OCL_Strong:
+    exn = CGF.EmitARCRetainNonBlock(exn);
+    [[fallthrough]];
+
+  case Qualifiers::OCL_None:
+  case Qualifiers::OCL_ExplicitNone:
+  case Qualifiers::OCL_Autoreleasing:
+    CGF.Builder.CreateStore(exn, paramAddr);
+    return;
+
+  case Qualifiers::OCL_Weak:
+    CGF.EmitARCInitWeak(paramAddr, exn);
+    return;
+  }
+  llvm_unreachable("invalid ownership qualifier");
+}
+
+namespace {
+  struct CallSyncExit final : EHScopeStack::Cleanup {
+    llvm::FunctionCallee SyncExitFn;
+    llvm::Value *SyncArg;
+    CallSyncExit(llvm::FunctionCallee SyncExitFn, llvm::Value *SyncArg)
+        : SyncExitFn(SyncExitFn), SyncArg(SyncArg) {}
+
+    void Emit(CodeGenFunction &CGF, Flags flags) override {
+      CGF.EmitNounwindRuntimeCall(SyncExitFn, SyncArg);
+    }
+  };
+}
+
+void CGObjCRuntime::EmitAtSynchronizedStmt(CodeGenFunction &CGF,
+                                           const ObjCAtSynchronizedStmt &S,
+                                           llvm::FunctionCallee syncEnterFn,
+                                           llvm::FunctionCallee syncExitFn) {
+  CodeGenFunction::RunCleanupsScope cleanups(CGF);
+
+  // Evaluate the lock operand.  This is guaranteed to dominate the
+  // ARC release and lock-release cleanups.
+  const Expr *lockExpr = S.getSynchExpr();
+  llvm::Value *lock;
+  if (CGF.getLangOpts().ObjCAutoRefCount) {
+    lock = CGF.EmitARCRetainScalarExpr(lockExpr);
+    lock = CGF.EmitObjCConsumeObject(lockExpr->getType(), lock);
+  } else {
+    lock = CGF.EmitScalarExpr(lockExpr);
+  }
+  lock = CGF.Builder.CreateBitCast(lock, CGF.VoidPtrTy);
+
+  // Acquire the lock.
+  CGF.Builder.CreateCall(syncEnterFn, lock)->setDoesNotThrow();
+
+  // Register an all-paths cleanup to release the lock.
+  CGF.EHStack.pushCleanup<CallSyncExit>(NormalAndEHCleanup, syncExitFn, lock);
+
+  // Emit the body of the statement.
+  CGF.EmitStmt(S.getSynchBody());
+}
+
+/// Compute the pointer-to-function type to which a message send
+/// should be casted in order to correctly call the given method
+/// with the given arguments.
+///
+/// \param method - may be null
+/// \param resultType - the result type to use if there's no method
+/// \param callArgs - the actual arguments, including implicit ones
+CGObjCRuntime::MessageSendInfo
+CGObjCRuntime::getMessageSendInfo(const ObjCMethodDecl *method,
+                                  QualType resultType,
+                                  CallArgList &callArgs) {
+  unsigned ProgramAS = CGM.getDataLayout().getProgramAddressSpace();
+
+  // If there's a method, use information from that.
+  if (method) {
+    const CGFunctionInfo &signature =
+      CGM.getTypes().arrangeObjCMessageSendSignature(method, callArgs[0].Ty);
+
+    llvm::PointerType *signatureType =
+      CGM.getTypes().GetFunctionType(signature)->getPointerTo(ProgramAS);
+
+    const CGFunctionInfo &signatureForCall =
+      CGM.getTypes().arrangeCall(signature, callArgs);
+
+    return MessageSendInfo(signatureForCall, signatureType);
+  }
+
+  // There's no method;  just use a default CC.
+  const CGFunctionInfo &argsInfo =
+    CGM.getTypes().arrangeUnprototypedObjCMessageSend(resultType, callArgs);
+
+  // Derive the signature to call from that.
+  llvm::PointerType *signatureType =
+    CGM.getTypes().GetFunctionType(argsInfo)->getPointerTo(ProgramAS);
+  return MessageSendInfo(argsInfo, signatureType);
+}
+
+bool CGObjCRuntime::canMessageReceiverBeNull(CodeGenFunction &CGF,
+                                             const ObjCMethodDecl *method,
+                                             bool isSuper,
+                                       const ObjCInterfaceDecl *classReceiver,
+                                             llvm::Value *receiver) {
+  // Super dispatch assumes that self is non-null; even the messenger
+  // doesn't have a null check internally.
+  if (isSuper)
+    return false;
+
+  // If this is a direct dispatch of a class method, check whether the class,
+  // or anything in its hierarchy, was weak-linked.
+  if (classReceiver && method && method->isClassMethod())
+    return isWeakLinkedClass(classReceiver);
+
+  // If we're emitting a method, and self is const (meaning just ARC, for now),
+  // and the receiver is a load of self, then self is a valid object.
+  if (auto curMethod =
+               dyn_cast_or_null<ObjCMethodDecl>(CGF.CurCodeDecl)) {
+    auto self = curMethod->getSelfDecl();
+    if (self->getType().isConstQualified()) {
+      if (auto LI = dyn_cast<llvm::LoadInst>(receiver->stripPointerCasts())) {
+        llvm::Value *selfAddr = CGF.GetAddrOfLocalVar(self).getPointer();
+        if (selfAddr == LI->getPointerOperand()) {
+          return false;
+        }
+      }
+    }
+  }
+
+  // Otherwise, assume it can be null.
+  return true;
+}
+
+bool CGObjCRuntime::isWeakLinkedClass(const ObjCInterfaceDecl *ID) {
+  do {
+    if (ID->isWeakImported())
+      return true;
+  } while ((ID = ID->getSuperClass()));
+
+  return false;
+}
+
+void CGObjCRuntime::destroyCalleeDestroyedArguments(CodeGenFunction &CGF,
+                                              const ObjCMethodDecl *method,
+                                              const CallArgList &callArgs) {
+  CallArgList::const_iterator I = callArgs.begin();
+  for (auto i = method->param_begin(), e = method->param_end();
+         i != e; ++i, ++I) {
+    const ParmVarDecl *param = (*i);
+    if (param->hasAttr<NSConsumedAttr>()) {
+      RValue RV = I->getRValue(CGF);
+      assert(RV.isScalar() &&
+             "NullReturnState::complete - arg not on object");
+      CGF.EmitARCRelease(RV.getScalarVal(), ARCImpreciseLifetime);
+    } else {
+      QualType QT = param->getType();
+      auto *RT = QT->getAs<RecordType>();
+      if (RT && RT->getDecl()->isParamDestroyedInCallee()) {
+        RValue RV = I->getRValue(CGF);
+        QualType::DestructionKind DtorKind = QT.isDestructedType();
+        switch (DtorKind) {
+        case QualType::DK_cxx_destructor:
+          CGF.destroyCXXObject(CGF, RV.getAggregateAddress(), QT);
+          break;
+        case QualType::DK_nontrivial_c_struct:
+          CGF.destroyNonTrivialCStruct(CGF, RV.getAggregateAddress(), QT);
+          break;
+        default:
+          llvm_unreachable("unexpected dtor kind");
+          break;
+        }
+      }
+    }
+  }
+}
+
+llvm::Constant *
+clang::CodeGen::emitObjCProtocolObject(CodeGenModule &CGM,
+                                       const ObjCProtocolDecl *protocol) {
+  return CGM.getObjCRuntime().GetOrEmitProtocol(protocol);
+}
+
+std::string CGObjCRuntime::getSymbolNameForMethod(const ObjCMethodDecl *OMD,
+                                                  bool includeCategoryName) {
+  std::string buffer;
+  llvm::raw_string_ostream out(buffer);
+  CGM.getCXXABI().getMangleContext().mangleObjCMethodName(OMD, out,
+                                       /*includePrefixByte=*/true,
+                                       includeCategoryName);
+  return buffer;
+}