CGDeclCXX.cpp | Explore in Territory

//===--- CGDeclCXX.cpp - Emit LLVM Code for C++ declarations --------------===//
//
// 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 contains code dealing with code generation of C++ declarations
//
//===----------------------------------------------------------------------===//

#include "CGCXXABI.h"
#include "CGHLSLRuntime.h"
#include "CGObjCRuntime.h"
#include "CGOpenMPRuntime.h"
#include "CodeGenFunction.h"
#include "TargetInfo.h"
#include "clang/AST/Attr.h"
#include "clang/Basic/LangOptions.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/Support/Path.h"

usingnamespaceclang;
usingnamespaceCodeGen;

static void EmitDeclInit(CodeGenFunction &CGF, const VarDecl &D,
                         ConstantAddress DeclPtr) { … }

/// Emit code to cause the destruction of the given variable with
/// static storage duration.
static void EmitDeclDestroy(CodeGenFunction &CGF, const VarDecl &D,
                            ConstantAddress Addr) { … }

/// Emit code to cause the variable at the given address to be considered as
/// constant from this point onwards.
static void EmitDeclInvariant(CodeGenFunction &CGF, const VarDecl &D,
                              llvm::Constant *Addr) { … }

void CodeGenFunction::EmitInvariantStart(llvm::Constant *Addr, CharUnits Size) { … }

void CodeGenFunction::EmitCXXGlobalVarDeclInit(const VarDecl &D,
                                               llvm::GlobalVariable *GV,
                                               bool PerformInit) { … }

/// Create a stub function, suitable for being passed to atexit,
/// which passes the given address to the given destructor function.
llvm::Constant *CodeGenFunction::createAtExitStub(const VarDecl &VD,
                                                  llvm::FunctionCallee dtor,
                                                  llvm::Constant *addr) { … }

/// Create a stub function, suitable for being passed to __pt_atexit_np,
/// which passes the given address to the given destructor function.
llvm::Function *CodeGenFunction::createTLSAtExitStub(
    const VarDecl &D, llvm::FunctionCallee Dtor, llvm::Constant *Addr,
    llvm::FunctionCallee &AtExit) { … }

/// Register a global destructor using the C atexit runtime function.
void CodeGenFunction::registerGlobalDtorWithAtExit(const VarDecl &VD,
                                                   llvm::FunctionCallee dtor,
                                                   llvm::Constant *addr) { … }

/// Register a global destructor using the LLVM 'llvm.global_dtors' global.
void CodeGenFunction::registerGlobalDtorWithLLVM(const VarDecl &VD,
                                                 llvm::FunctionCallee Dtor,
                                                 llvm::Constant *Addr) { … }

void CodeGenFunction::registerGlobalDtorWithAtExit(llvm::Constant *dtorStub) { … }

llvm::Value *
CodeGenFunction::unregisterGlobalDtorWithUnAtExit(llvm::Constant *dtorStub) { … }

void CodeGenFunction::EmitCXXGuardedInit(const VarDecl &D,
                                         llvm::GlobalVariable *DeclPtr,
                                         bool PerformInit) { … }

void CodeGenFunction::EmitCXXGuardedInitBranch(llvm::Value *NeedsInit,
                                               llvm::BasicBlock *InitBlock,
                                               llvm::BasicBlock *NoInitBlock,
                                               GuardKind Kind,
                                               const VarDecl *D) { … }

llvm::Function *CodeGenModule::CreateGlobalInitOrCleanUpFunction(
    llvm::FunctionType *FTy, const Twine &Name, const CGFunctionInfo &FI,
    SourceLocation Loc, bool TLS, llvm::GlobalVariable::LinkageTypes Linkage) { … }

/// Create a global pointer to a function that will initialize a global
/// variable.  The user has requested that this pointer be emitted in a specific
/// section.
void CodeGenModule::EmitPointerToInitFunc(const VarDecl *D,
                                          llvm::GlobalVariable *GV,
                                          llvm::Function *InitFunc,
                                          InitSegAttr *ISA) { … }

void
CodeGenModule::EmitCXXGlobalVarDeclInitFunc(const VarDecl *D,
                                            llvm::GlobalVariable *Addr,
                                            bool PerformInit) { … }

void CodeGenModule::EmitCXXThreadLocalInitFunc() { … }

/* Build the initializer for a C++20 module:
   This is arranged to be run only once regardless of how many times the module
   might be included transitively.  This arranged by using a guard variable.

   If there are no initializers at all (and also no imported modules) we reduce
   this to an empty function (since the Itanium ABI requires that this function
   be available to a caller, which might be produced by a different
   implementation).

   First we call any initializers for imported modules.
   We then call initializers for the Global Module Fragment (if present)
   We then call initializers for the current module.
   We then call initializers for the Private Module Fragment (if present)
*/

void CodeGenModule::EmitCXXModuleInitFunc(Module *Primary) { … }

static SmallString<128> getTransformedFileName(llvm::Module &M) { … }

static std::string getPrioritySuffix(unsigned int Priority) { … }

void
CodeGenModule::EmitCXXGlobalInitFunc() { … }

void CodeGenModule::EmitCXXGlobalCleanUpFunc() { … }

/// Emit the code necessary to initialize the given global variable.
void CodeGenFunction::GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn,
                                                       const VarDecl *D,
                                                 llvm::GlobalVariable *Addr,
                                                       bool PerformInit) { … }

void
CodeGenFunction::GenerateCXXGlobalInitFunc(llvm::Function *Fn,
                                           ArrayRef<llvm::Function *> Decls,
                                           ConstantAddress Guard) { … }

void CodeGenFunction::GenerateCXXGlobalCleanUpFunc(
    llvm::Function *Fn,
    ArrayRef<std::tuple<llvm::FunctionType *, llvm::WeakTrackingVH,
                        llvm::Constant *>>
        DtorsOrStermFinalizers) { … }

/// generateDestroyHelper - Generates a helper function which, when
/// invoked, destroys the given object.  The address of the object
/// should be in global memory.
llvm::Function *CodeGenFunction::generateDestroyHelper(
    Address addr, QualType type, Destroyer *destroyer,
    bool useEHCleanupForArray, const VarDecl *VD) { … }
llvm/clang/lib/CodeGen/CGDeclCXX.cpp
