зеркало из https://github.com/microsoft/clang-1.git
255 строки
10 KiB
C++
255 строки
10 KiB
C++
//===--- CodeGenTypes.h - Type translation for LLVM CodeGen -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is the code that handles AST -> LLVM type lowering.
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//
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//===----------------------------------------------------------------------===//
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#ifndef CLANG_CODEGEN_CODEGENTYPES_H
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#define CLANG_CODEGEN_CODEGENTYPES_H
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#include "CGCall.h"
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#include "clang/AST/GlobalDecl.h"
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#include "llvm/Module.h"
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#include "llvm/ADT/DenseMap.h"
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#include <vector>
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namespace llvm {
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class FunctionType;
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class Module;
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class TargetData;
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class Type;
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class LLVMContext;
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class StructType;
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}
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namespace clang {
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class ABIInfo;
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class ASTContext;
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template <typename> class CanQual;
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class CXXConstructorDecl;
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class CXXDestructorDecl;
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class CXXMethodDecl;
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class CodeGenOptions;
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class FieldDecl;
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class FunctionProtoType;
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class ObjCInterfaceDecl;
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class ObjCIvarDecl;
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class PointerType;
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class QualType;
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class RecordDecl;
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class TagDecl;
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class TargetInfo;
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class Type;
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typedef CanQual<Type> CanQualType;
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namespace CodeGen {
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class CGCXXABI;
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class CGRecordLayout;
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class CodeGenModule;
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class RequiredArgs;
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/// CodeGenTypes - This class organizes the cross-module state that is used
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/// while lowering AST types to LLVM types.
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class CodeGenTypes {
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// Some of this stuff should probably be left on the CGM.
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ASTContext &Context;
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const TargetInfo &Target;
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llvm::Module &TheModule;
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const llvm::TargetData &TheTargetData;
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const ABIInfo &TheABIInfo;
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CGCXXABI &TheCXXABI;
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const CodeGenOptions &CodeGenOpts;
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CodeGenModule &CGM;
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/// The opaque type map for Objective-C interfaces. All direct
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/// manipulation is done by the runtime interfaces, which are
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/// responsible for coercing to the appropriate type; these opaque
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/// types are never refined.
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llvm::DenseMap<const ObjCInterfaceType*, llvm::Type *> InterfaceTypes;
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/// CGRecordLayouts - This maps llvm struct type with corresponding
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/// record layout info.
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llvm::DenseMap<const Type*, CGRecordLayout *> CGRecordLayouts;
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/// RecordDeclTypes - This contains the LLVM IR type for any converted
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/// RecordDecl.
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llvm::DenseMap<const Type*, llvm::StructType *> RecordDeclTypes;
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/// FunctionInfos - Hold memoized CGFunctionInfo results.
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llvm::FoldingSet<CGFunctionInfo> FunctionInfos;
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/// RecordsBeingLaidOut - This set keeps track of records that we're currently
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/// converting to an IR type. For example, when converting:
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/// struct A { struct B { int x; } } when processing 'x', the 'A' and 'B'
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/// types will be in this set.
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llvm::SmallPtrSet<const Type*, 4> RecordsBeingLaidOut;
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llvm::SmallPtrSet<const CGFunctionInfo*, 4> FunctionsBeingProcessed;
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/// SkippedLayout - True if we didn't layout a function due to a being inside
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/// a recursive struct conversion, set this to true.
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bool SkippedLayout;
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SmallVector<const RecordDecl *, 8> DeferredRecords;
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private:
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/// TypeCache - This map keeps cache of llvm::Types
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/// and maps llvm::Types to corresponding clang::Type.
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llvm::DenseMap<const Type *, llvm::Type *> TypeCache;
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public:
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CodeGenTypes(CodeGenModule &CGM);
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~CodeGenTypes();
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const llvm::TargetData &getTargetData() const { return TheTargetData; }
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const TargetInfo &getTarget() const { return Target; }
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ASTContext &getContext() const { return Context; }
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const ABIInfo &getABIInfo() const { return TheABIInfo; }
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const CodeGenOptions &getCodeGenOpts() const { return CodeGenOpts; }
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CGCXXABI &getCXXABI() const { return TheCXXABI; }
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llvm::LLVMContext &getLLVMContext() { return TheModule.getContext(); }
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/// ConvertType - Convert type T into a llvm::Type.
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llvm::Type *ConvertType(QualType T);
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/// ConvertTypeForMem - Convert type T into a llvm::Type. This differs from
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/// ConvertType in that it is used to convert to the memory representation for
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/// a type. For example, the scalar representation for _Bool is i1, but the
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/// memory representation is usually i8 or i32, depending on the target.
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llvm::Type *ConvertTypeForMem(QualType T);
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/// GetFunctionType - Get the LLVM function type for \arg Info.
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llvm::FunctionType *GetFunctionType(const CGFunctionInfo &Info);
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llvm::FunctionType *GetFunctionType(GlobalDecl GD);
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/// isFuncTypeConvertible - Utility to check whether a function type can
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/// be converted to an LLVM type (i.e. doesn't depend on an incomplete tag
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/// type).
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bool isFuncTypeConvertible(const FunctionType *FT);
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bool isFuncTypeArgumentConvertible(QualType Ty);
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/// GetFunctionTypeForVTable - Get the LLVM function type for use in a vtable,
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/// given a CXXMethodDecl. If the method to has an incomplete return type,
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/// and/or incomplete argument types, this will return the opaque type.
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llvm::Type *GetFunctionTypeForVTable(GlobalDecl GD);
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const CGRecordLayout &getCGRecordLayout(const RecordDecl*);
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/// UpdateCompletedType - When we find the full definition for a TagDecl,
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/// replace the 'opaque' type we previously made for it if applicable.
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void UpdateCompletedType(const TagDecl *TD);
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/// getNullaryFunctionInfo - Get the function info for a void()
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/// function with standard CC.
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const CGFunctionInfo &arrangeNullaryFunction();
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// The arrangement methods are split into three families:
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// - those meant to drive the signature and prologue/epilogue
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// of a function declaration or definition,
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// - those meant for the computation of the LLVM type for an abstract
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// appearance of a function, and
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// - those meant for performing the IR-generation of a call.
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// They differ mainly in how they deal with optional (i.e. variadic)
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// arguments, as well as unprototyped functions.
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//
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// Key points:
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// - The CGFunctionInfo for emitting a specific call site must include
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// entries for the optional arguments.
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// - The function type used at the call site must reflect the formal
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// signature of the declaration being called, or else the call will
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// go awry.
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// - For the most part, unprototyped functions are called by casting to
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// a formal signature inferred from the specific argument types used
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// at the call-site. However, some targets (e.g. x86-64) screw with
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// this for compatibility reasons.
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const CGFunctionInfo &arrangeGlobalDeclaration(GlobalDecl GD);
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const CGFunctionInfo &arrangeFunctionDeclaration(const FunctionDecl *FD);
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const CGFunctionInfo &arrangeFunctionDeclaration(QualType ResTy,
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const FunctionArgList &Args,
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const FunctionType::ExtInfo &Info,
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bool isVariadic);
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const CGFunctionInfo &arrangeObjCMethodDeclaration(const ObjCMethodDecl *MD);
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const CGFunctionInfo &arrangeObjCMessageSendSignature(const ObjCMethodDecl *MD,
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QualType receiverType);
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const CGFunctionInfo &arrangeCXXMethodDeclaration(const CXXMethodDecl *MD);
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const CGFunctionInfo &arrangeCXXConstructorDeclaration(
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const CXXConstructorDecl *D,
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CXXCtorType Type);
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const CGFunctionInfo &arrangeCXXDestructor(const CXXDestructorDecl *D,
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CXXDtorType Type);
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const CGFunctionInfo &arrangeFunctionCall(const CallArgList &Args,
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const FunctionType *Ty);
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const CGFunctionInfo &arrangeFunctionCall(QualType ResTy,
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const CallArgList &args,
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const FunctionType::ExtInfo &info,
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RequiredArgs required);
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const CGFunctionInfo &arrangeFunctionType(CanQual<FunctionProtoType> Ty);
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const CGFunctionInfo &arrangeFunctionType(CanQual<FunctionNoProtoType> Ty);
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const CGFunctionInfo &arrangeCXXMethodType(const CXXRecordDecl *RD,
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const FunctionProtoType *FTP);
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/// Retrieves the ABI information for the given function signature.
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/// This is the "core" routine to which all the others defer.
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///
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/// \param argTypes - must all actually be canonical as params
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const CGFunctionInfo &arrangeFunctionType(CanQualType returnType,
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ArrayRef<CanQualType> argTypes,
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const FunctionType::ExtInfo &info,
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RequiredArgs args);
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/// \brief Compute a new LLVM record layout object for the given record.
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CGRecordLayout *ComputeRecordLayout(const RecordDecl *D,
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llvm::StructType *Ty);
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/// addRecordTypeName - Compute a name from the given record decl with an
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/// optional suffix and name the given LLVM type using it.
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void addRecordTypeName(const RecordDecl *RD, llvm::StructType *Ty,
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StringRef suffix);
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public: // These are internal details of CGT that shouldn't be used externally.
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/// ConvertRecordDeclType - Lay out a tagged decl type like struct or union.
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llvm::StructType *ConvertRecordDeclType(const RecordDecl *TD);
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/// GetExpandedTypes - Expand the type \arg Ty into the LLVM
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/// argument types it would be passed as on the provided vector \arg
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/// ArgTys. See ABIArgInfo::Expand.
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void GetExpandedTypes(QualType type,
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SmallVectorImpl<llvm::Type*> &expanded);
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/// IsZeroInitializable - Return whether a type can be
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/// zero-initialized (in the C++ sense) with an LLVM zeroinitializer.
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bool isZeroInitializable(QualType T);
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/// IsZeroInitializable - Return whether a record type can be
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/// zero-initialized (in the C++ sense) with an LLVM zeroinitializer.
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bool isZeroInitializable(const CXXRecordDecl *RD);
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bool isRecordLayoutComplete(const Type *Ty) const;
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bool noRecordsBeingLaidOut() const {
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return RecordsBeingLaidOut.empty();
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}
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bool isRecordBeingLaidOut(const Type *Ty) const {
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return RecordsBeingLaidOut.count(Ty);
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}
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};
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} // end namespace CodeGen
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} // end namespace clang
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#endif
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