clang/lib/CodeGen/CodeGenABITypes.cpp

   1 //==--- CodeGenABITypes.cpp - Convert Clang types to LLVM types for ABI ----==//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // CodeGenABITypes is a simple interface for getting LLVM types for
  10 // the parameters and the return value of a function given the Clang
  11 // types.
  12 //
  13 // The class is implemented as a public wrapper around the private
  14 // CodeGenTypes class in lib/CodeGen.
  15 //
  16 //===----------------------------------------------------------------------===//
  17
  18 #include "clang/CodeGen/CodeGenABITypes.h"
  19 #include "CGCXXABI.h"
  20 #include "CGRecordLayout.h"
  21 #include "CodeGenFunction.h"
  22 #include "CodeGenModule.h"
  23 #include "clang/CodeGen/CGFunctionInfo.h"
  24 #include "clang/Lex/HeaderSearchOptions.h"
  25 #include "clang/Lex/PreprocessorOptions.h"
  26
  27 using namespace clang;
  28 using namespace CodeGen;
  29
  30 void CodeGen::addDefaultFunctionDefinitionAttributes(CodeGenModule &CGM,
  31                                                      llvm::AttrBuilder &attrs) {
  32   CGM.addDefaultFunctionDefinitionAttributes(attrs);
  33 }
  34
  35 const CGFunctionInfo &
  36 CodeGen::arrangeObjCMessageSendSignature(CodeGenModule &CGM,
  37                                          const ObjCMethodDecl *MD,
  38                                          QualType receiverType) {
  39   return CGM.getTypes().arrangeObjCMessageSendSignature(MD, receiverType);
  40 }
  41
  42 const CGFunctionInfo &
  43 CodeGen::arrangeFreeFunctionType(CodeGenModule &CGM,
  44                                  CanQual<FunctionProtoType> Ty) {
  45   return CGM.getTypes().arrangeFreeFunctionType(Ty);
  46 }
  47
  48 const CGFunctionInfo &
  49 CodeGen::arrangeFreeFunctionType(CodeGenModule &CGM,
  50                                  CanQual<FunctionNoProtoType> Ty) {
  51   return CGM.getTypes().arrangeFreeFunctionType(Ty);
  52 }
  53
  54 const CGFunctionInfo &
  55 CodeGen::arrangeCXXMethodType(CodeGenModule &CGM,
  56                               const CXXRecordDecl *RD,
  57                               const FunctionProtoType *FTP,
  58                               const CXXMethodDecl *MD) {
  59   return CGM.getTypes().arrangeCXXMethodType(RD, FTP, MD);
  60 }
  61
  62 const CGFunctionInfo &
  63 CodeGen::arrangeFreeFunctionCall(CodeGenModule &CGM,
  64                                  CanQualType returnType,
  65                                  ArrayRef<CanQualType> argTypes,
  66                                  FunctionType::ExtInfo info,
  67                                  RequiredArgs args) {
  68   return CGM.getTypes().arrangeLLVMFunctionInfo(returnType, FnInfoOpts::None,
  69                                                 argTypes, info, {}, args);
  70 }
  71
  72 ImplicitCXXConstructorArgs
  73 CodeGen::getImplicitCXXConstructorArgs(CodeGenModule &CGM,
  74                                        const CXXConstructorDecl *D) {
  75   // We have to create a dummy CodeGenFunction here to pass to
  76   // getImplicitConstructorArgs(). In some cases (base and delegating
  77   // constructor calls), getImplicitConstructorArgs() can reach into the
  78   // CodeGenFunction to find parameters of the calling constructor to pass on to
  79   // the called constructor, but that can't happen here because we're asking for
  80   // the args for a complete, non-delegating constructor call.
  81   CodeGenFunction CGF(CGM, /* suppressNewContext= */ true);
  82   CGCXXABI::AddedStructorArgs addedArgs =
  83       CGM.getCXXABI().getImplicitConstructorArgs(CGF, D, Ctor_Complete,
  84                                                  /* ForVirtualBase= */ false,
  85                                                  /* Delegating= */ false);
  86   ImplicitCXXConstructorArgs implicitArgs;
  87   for (const auto &arg : addedArgs.Prefix) {
  88     implicitArgs.Prefix.push_back(arg.Value);
  89   }
  90   for (const auto &arg : addedArgs.Suffix) {
  91     implicitArgs.Suffix.push_back(arg.Value);
  92   }
  93   return implicitArgs;
  94 }
  95
  96 llvm::FunctionType *
  97 CodeGen::convertFreeFunctionType(CodeGenModule &CGM, const FunctionDecl *FD) {
  98   assert(FD != nullptr && "Expected a non-null function declaration!");
  99   llvm::Type *T = CGM.getTypes().ConvertType(FD->getType());
 100
 101   if (auto FT = dyn_cast<llvm::FunctionType>(T))
 102     return FT;
 103
 104   return nullptr;
 105 }
 106
 107 llvm::Type *
 108 CodeGen::convertTypeForMemory(CodeGenModule &CGM, QualType T) {
 109   return CGM.getTypes().ConvertTypeForMem(T);
 110 }
 111
 112 unsigned CodeGen::getLLVMFieldNumber(CodeGenModule &CGM,
 113                                      const RecordDecl *RD,
 114                                      const FieldDecl *FD) {
 115   return CGM.getTypes().getCGRecordLayout(RD).getLLVMFieldNo(FD);
 116 }
 117
 118 llvm::Value *CodeGen::getCXXDestructorImplicitParam(
 119     CodeGenModule &CGM, llvm::BasicBlock *InsertBlock,
 120     llvm::BasicBlock::iterator InsertPoint, const CXXDestructorDecl *D,
 121     CXXDtorType Type, bool ForVirtualBase, bool Delegating) {
 122   CodeGenFunction CGF(CGM, /*suppressNewContext=*/true);
 123   CGF.CurCodeDecl = D;
 124   CGF.CurFuncDecl = D;
 125   CGF.CurFn = InsertBlock->getParent();
 126   CGF.Builder.SetInsertPoint(InsertBlock, InsertPoint);
 127   return CGM.getCXXABI().getCXXDestructorImplicitParam(
 128       CGF, D, Type, ForVirtualBase, Delegating);
 129 }