llvm/clang/lib/CodeGen/CGObjCRuntime.cpp

//==- 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"

usingnamespaceclang;
usingnamespaceCodeGen;

uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM,
                                              const ObjCInterfaceDecl *OID,
                                              const ObjCIvarDecl *Ivar) { … }

uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM,
                                              const ObjCImplementationDecl *OID,
                                              const ObjCIvarDecl *Ivar) { … }

unsigned CGObjCRuntime::ComputeBitfieldBitOffset(
    CodeGen::CodeGenModule &CGM,
    const ObjCInterfaceDecl *ID,
    const ObjCIvarDecl *Ivar) { … }

LValue CGObjCRuntime::EmitValueForIvarAtOffset(CodeGen::CodeGenFunction &CGF,
                                               const ObjCInterfaceDecl *OID,
                                               llvm::Value *BaseValue,
                                               const ObjCIvarDecl *Ivar,
                                               unsigned CVRQualifiers,
                                               llvm::Value *Offset) { … }

namespace {
  struct CatchHandler { … };

  struct CallObjCEndCatch final : EHScopeStack::Cleanup { … };
}

void CGObjCRuntime::EmitTryCatchStmt(CodeGenFunction &CGF,
                                     const ObjCAtTryStmt &S,
                                     llvm::FunctionCallee beginCatchFn,
                                     llvm::FunctionCallee endCatchFn,
                                     llvm::FunctionCallee exceptionRethrowFn) { … }

void CGObjCRuntime::EmitInitOfCatchParam(CodeGenFunction &CGF,
                                         llvm::Value *exn,
                                         const VarDecl *paramDecl) { … }

namespace {
  struct CallSyncExit final : EHScopeStack::Cleanup { … };
}

void CGObjCRuntime::EmitAtSynchronizedStmt(CodeGenFunction &CGF,
                                           const ObjCAtSynchronizedStmt &S,
                                           llvm::FunctionCallee syncEnterFn,
                                           llvm::FunctionCallee syncExitFn) { … }

/// 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) { … }

bool CGObjCRuntime::canMessageReceiverBeNull(CodeGenFunction &CGF,
                                             const ObjCMethodDecl *method,
                                             bool isSuper,
                                       const ObjCInterfaceDecl *classReceiver,
                                             llvm::Value *receiver) { … }

bool CGObjCRuntime::isWeakLinkedClass(const ObjCInterfaceDecl *ID) { … }

void CGObjCRuntime::destroyCalleeDestroyedArguments(CodeGenFunction &CGF,
                                              const ObjCMethodDecl *method,
                                              const CallArgList &callArgs) { … }

llvm::Constant *
clang::CodeGen::emitObjCProtocolObject(CodeGenModule &CGM,
                                       const ObjCProtocolDecl *protocol) { … }

std::string CGObjCRuntime::getSymbolNameForMethod(const ObjCMethodDecl *OMD,
                                                  bool includeCategoryName) { … }