//==---- CodeGenABITypes.h - Convert Clang types to LLVM types for ABI -----==//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// CodeGenABITypes is a simple interface for getting LLVM types for
// the parameters and the return value of a function given the Clang
// types.
//
// The class is implemented as a public wrapper around the private
// CodeGenTypes class in lib/CodeGen.
//
// It allows other clients, like LLDB, to determine the LLVM types that are
// actually used in function calls, which makes it possible to then determine
// the actual ABI locations (e.g. registers, stack locations, etc.) that
// these parameters are stored in.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_CODEGEN_CODEGENABITYPES_H
#define LLVM_CLANG_CODEGEN_CODEGENABITYPES_H
#include "clang/AST/CanonicalType.h"
#include "clang/AST/Type.h"
#include "clang/Basic/ABI.h"
#include "clang/CodeGen/CGFunctionInfo.h"
#include "llvm/IR/BasicBlock.h"
namespace llvm {
class AttrBuilder;
class Constant;
class Function;
class FunctionType;
class Type;
}
namespace clang {
class CXXConstructorDecl;
class CXXDestructorDecl;
class CXXRecordDecl;
class CXXMethodDecl;
class ObjCMethodDecl;
class ObjCProtocolDecl;
namespace CodeGen {
class CGFunctionInfo;
class CodeGenModule;
/// Additional implicit arguments to add to a constructor argument list.
struct ImplicitCXXConstructorArgs {
/// Implicit arguments to add before the explicit arguments, but after the
/// `*this` argument (which always comes first).
SmallVector<llvm::Value *, 1> Prefix;
/// Implicit arguments to add after the explicit arguments.
SmallVector<llvm::Value *, 1> Suffix;
};
const CGFunctionInfo &arrangeObjCMessageSendSignature(CodeGenModule &CGM,
const ObjCMethodDecl *MD,
QualType receiverType);
const CGFunctionInfo &arrangeFreeFunctionType(CodeGenModule &CGM,
CanQual<FunctionProtoType> Ty);
const CGFunctionInfo &arrangeFreeFunctionType(CodeGenModule &CGM,
CanQual<FunctionNoProtoType> Ty);
const CGFunctionInfo &arrangeCXXMethodType(CodeGenModule &CGM,
const CXXRecordDecl *RD,
const FunctionProtoType *FTP,
const CXXMethodDecl *MD);
const CGFunctionInfo &arrangeFreeFunctionCall(CodeGenModule &CGM,
CanQualType returnType,
ArrayRef<CanQualType> argTypes,
FunctionType::ExtInfo info,
RequiredArgs args);
/// Returns the implicit arguments to add to a complete, non-delegating C++
/// constructor call.
ImplicitCXXConstructorArgs
getImplicitCXXConstructorArgs(CodeGenModule &CGM, const CXXConstructorDecl *D);
llvm::Value *
getCXXDestructorImplicitParam(CodeGenModule &CGM, llvm::BasicBlock *InsertBlock,
llvm::BasicBlock::iterator InsertPoint,
const CXXDestructorDecl *D, CXXDtorType Type,
bool ForVirtualBase, bool Delegating);
/// Returns null if the function type is incomplete and can't be lowered.
llvm::FunctionType *convertFreeFunctionType(CodeGenModule &CGM,
const FunctionDecl *FD);
llvm::Type *convertTypeForMemory(CodeGenModule &CGM, QualType T);
/// Given a non-bitfield struct field, return its index within the elements of
/// the struct's converted type. The returned index refers to a field number in
/// the complete object type which is returned by convertTypeForMemory. FD must
/// be a field in RD directly (i.e. not an inherited field).
unsigned getLLVMFieldNumber(CodeGenModule &CGM,
const RecordDecl *RD, const FieldDecl *FD);
/// Given the language and code-generation options that Clang was configured
/// with, set the default LLVM IR attributes for a function definition.
/// The attributes set here are mostly global target-configuration and
/// pipeline-configuration options like the target CPU, variant stack
/// rules, whether to optimize for size, and so on. This is useful for
/// frontends (such as Swift) that generally intend to interoperate with
/// C code and rely on Clang's target configuration logic.
///
/// As a general rule, this function assumes that meaningful attributes
/// haven't already been added to the builder. It won't intentionally
/// displace any existing attributes, but it also won't check to avoid
/// overwriting them. Callers should generally apply customizations after
/// making this call.
///
/// This function assumes that the caller is not defining a function that
/// requires special no-builtin treatment.
void addDefaultFunctionDefinitionAttributes(CodeGenModule &CGM,
llvm::AttrBuilder &attrs);
/// Returns the default constructor for a C struct with non-trivially copyable
/// fields, generating it if necessary. The returned function uses the `cdecl`
/// calling convention, returns void, and takes a single argument that is a
/// pointer to the address of the struct.
llvm::Function *getNonTrivialCStructDefaultConstructor(CodeGenModule &GCM,
CharUnits DstAlignment,
bool IsVolatile,
QualType QT);
/// Returns the copy constructor for a C struct with non-trivially copyable
/// fields, generating it if necessary. The returned function uses the `cdecl`
/// calling convention, returns void, and takes two arguments: pointers to the
/// addresses of the destination and source structs, respectively.
llvm::Function *getNonTrivialCStructCopyConstructor(CodeGenModule &CGM,
CharUnits DstAlignment,
CharUnits SrcAlignment,
bool IsVolatile,
QualType QT);
/// Returns the move constructor for a C struct with non-trivially copyable
/// fields, generating it if necessary. The returned function uses the `cdecl`
/// calling convention, returns void, and takes two arguments: pointers to the
/// addresses of the destination and source structs, respectively.
llvm::Function *getNonTrivialCStructMoveConstructor(CodeGenModule &CGM,
CharUnits DstAlignment,
CharUnits SrcAlignment,
bool IsVolatile,
QualType QT);
/// Returns the copy assignment operator for a C struct with non-trivially
/// copyable fields, generating it if necessary. The returned function uses the
/// `cdecl` calling convention, returns void, and takes two arguments: pointers
/// to the addresses of the destination and source structs, respectively.
llvm::Function *getNonTrivialCStructCopyAssignmentOperator(
CodeGenModule &CGM, CharUnits DstAlignment, CharUnits SrcAlignment,
bool IsVolatile, QualType QT);
/// Return the move assignment operator for a C struct with non-trivially
/// copyable fields, generating it if necessary. The returned function uses the
/// `cdecl` calling convention, returns void, and takes two arguments: pointers
/// to the addresses of the destination and source structs, respectively.
llvm::Function *getNonTrivialCStructMoveAssignmentOperator(
CodeGenModule &CGM, CharUnits DstAlignment, CharUnits SrcAlignment,
bool IsVolatile, QualType QT);
/// Returns the destructor for a C struct with non-trivially copyable fields,
/// generating it if necessary. The returned function uses the `cdecl` calling
/// convention, returns void, and takes a single argument that is a pointer to
/// the address of the struct.
llvm::Function *getNonTrivialCStructDestructor(CodeGenModule &CGM,
CharUnits DstAlignment,
bool IsVolatile, QualType QT);
/// Get a pointer to a protocol object for the given declaration, emitting it if
/// it hasn't already been emitted in this translation unit. Note that the ABI
/// for emitting a protocol reference in code (e.g. for a protocol expression)
/// in most runtimes is not as simple as just materializing a pointer to this
/// object.
llvm::Constant *emitObjCProtocolObject(CodeGenModule &CGM,
const ObjCProtocolDecl *p);
} // end namespace CodeGen
} // end namespace clang
#endif