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//===----- ABIInfo.h - ABI information access & encapsulation ---*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
#include "clang/AST/Type.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/Type.h"
namespace llvm {
class Value;
class LLVMContext;
class DataLayout;
namespace clang {
class ASTContext;
class TargetInfo;
namespace CodeGen {
class ABIArgInfo;
class Address;
class CGFunctionInfo;
class CodeGenFunction;
class CodeGenTypes;
// FIXME: All of this stuff should be part of the target interface
// somehow. It is currently here because it is not clear how to factor
// the targets to support this, since the Targets currently live in a
// layer below types n'stuff.
/// ABIInfo - Target specific hooks for defining how a type should be
/// passed or returned from functions.
class ABIInfo {
CodeGen::CodeGenTypes &CGT;
llvm::CallingConv::ID RuntimeCC;
llvm::CallingConv::ID BuiltinCC;
ABIInfo(CodeGen::CodeGenTypes &cgt)
: CGT(cgt),
BuiltinCC(llvm::CallingConv::C) {}
virtual ~ABIInfo();
CodeGen::CGCXXABI &getCXXABI() const;
ASTContext &getContext() const;
llvm::LLVMContext &getVMContext() const;
const llvm::DataLayout &getDataLayout() const;
const TargetInfo &getTarget() const;
/// Return the calling convention to use for system runtime
/// functions.
llvm::CallingConv::ID getRuntimeCC() const {
return RuntimeCC;
/// Return the calling convention to use for compiler builtins
llvm::CallingConv::ID getBuiltinCC() const {
return BuiltinCC;
virtual void computeInfo(CodeGen::CGFunctionInfo &FI) const = 0;
/// EmitVAArg - Emit the target dependent code to load a value of
/// \arg Ty from the va_list pointed to by \arg VAListAddr.
// FIXME: This is a gaping layering violation if we wanted to drop
// the ABI information any lower than CodeGen. Of course, for
// VAArg handling it has to be at this level; there is no way to
// abstract this out.
virtual CodeGen::Address EmitVAArg(CodeGen::CodeGenFunction &CGF,
CodeGen::Address VAListAddr,
QualType Ty) const = 0;
/// Emit the target dependent code to load a value of
/// \arg Ty from the \c __builtin_ms_va_list pointed to by \arg VAListAddr.
virtual CodeGen::Address EmitMSVAArg(CodeGen::CodeGenFunction &CGF,
CodeGen::Address VAListAddr,
QualType Ty) const;
virtual bool isHomogeneousAggregateBaseType(QualType Ty) const;
virtual bool isHomogeneousAggregateSmallEnough(const Type *Base,
uint64_t Members) const;
virtual bool shouldSignExtUnsignedType(QualType Ty) const;
bool isHomogeneousAggregate(QualType Ty, const Type *&Base,
uint64_t &Members) const;
/// A convenience method to return an indirect ABIArgInfo with an
/// expected alignment equal to the ABI alignment of the given type.
getNaturalAlignIndirect(QualType Ty, bool ByRef = true,
bool Realign = false,
llvm::Type *Padding = nullptr) const;
getNaturalAlignIndirectInReg(QualType Ty, bool Realign = false) const;
} // end namespace clang