Home | History | Annotate | Line # | Download | only in CodeGen 
      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(
     69       returnType, /*instanceMethod=*/false, /*chainCall=*/false, argTypes,
     70       info, {}, args);
     71 }
     72 
     73 ImplicitCXXConstructorArgs
     74 CodeGen::getImplicitCXXConstructorArgs(CodeGenModule &CGM,
     75                                        const CXXConstructorDecl *D) {
     76   // We have to create a dummy CodeGenFunction here to pass to
     77   // getImplicitConstructorArgs(). In some cases (base and delegating
     78   // constructor calls), getImplicitConstructorArgs() can reach into the
     79   // CodeGenFunction to find parameters of the calling constructor to pass on to
     80   // the called constructor, but that can't happen here because we're asking for
     81   // the args for a complete, non-delegating constructor call.
     82   CodeGenFunction CGF(CGM, /* suppressNewContext= */ true);
     83   CGCXXABI::AddedStructorArgs addedArgs =
     84       CGM.getCXXABI().getImplicitConstructorArgs(CGF, D, Ctor_Complete,
     85                                                  /* ForVirtualBase= */ false,
     86                                                  /* Delegating= */ false);
     87   ImplicitCXXConstructorArgs implicitArgs;
     88   for (const auto &arg : addedArgs.Prefix) {
     89     implicitArgs.Prefix.push_back(arg.Value);
     90   }
     91   for (const auto &arg : addedArgs.Suffix) {
     92     implicitArgs.Suffix.push_back(arg.Value);
     93   }
     94   return implicitArgs;
     95 }
     96 
     97 llvm::FunctionType *
     98 CodeGen::convertFreeFunctionType(CodeGenModule &CGM, const FunctionDecl *FD) {
     99   assert(FD != nullptr && "Expected a non-null function declaration!");
    100   llvm::Type *T = CGM.getTypes().ConvertType(FD->getType());
    101 
    102   if (auto FT = dyn_cast<llvm::FunctionType>(T))
    103     return FT;
    104 
    105   return nullptr;
    106 }
    107 
    108 llvm::Type *
    109 CodeGen::convertTypeForMemory(CodeGenModule &CGM, QualType T) {
    110   return CGM.getTypes().ConvertTypeForMem(T);
    111 }
    112 
    113 unsigned CodeGen::getLLVMFieldNumber(CodeGenModule &CGM,
    114                                      const RecordDecl *RD,
    115                                      const FieldDecl *FD) {
    116   return CGM.getTypes().getCGRecordLayout(RD).getLLVMFieldNo(FD);
    117 }
    118 
    119 llvm::Value *CodeGen::getCXXDestructorImplicitParam(
    120     CodeGenModule &CGM, llvm::BasicBlock *InsertBlock,
    121     llvm::BasicBlock::iterator InsertPoint, const CXXDestructorDecl *D,
    122     CXXDtorType Type, bool ForVirtualBase, bool Delegating) {
    123   CodeGenFunction CGF(CGM, /*suppressNewContext=*/true);
    124   CGF.CurCodeDecl = D;
    125   CGF.CurFuncDecl = D;
    126   CGF.CurFn = InsertBlock->getParent();
    127   CGF.Builder.SetInsertPoint(InsertBlock, InsertPoint);
    128   return CGM.getCXXABI().getCXXDestructorImplicitParam(
    129       CGF, D, Type, ForVirtualBase, Delegating);
    130 }
    131