146 lines
4.8 KiB
C++
146 lines
4.8 KiB
C++
//===----- ABIInfo.h - ABI information access & encapsulation ---*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_LIB_CODEGEN_ABIINFO_H
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#define LLVM_CLANG_LIB_CODEGEN_ABIINFO_H
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#include "clang/AST/CharUnits.h"
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#include "clang/AST/Type.h"
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#include "llvm/IR/CallingConv.h"
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#include "llvm/IR/Type.h"
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namespace llvm {
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class Value;
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class LLVMContext;
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class DataLayout;
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class Type;
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}
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namespace clang {
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class ASTContext;
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class CodeGenOptions;
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class TargetInfo;
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namespace CodeGen {
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class ABIArgInfo;
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class Address;
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class CGCXXABI;
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class CGFunctionInfo;
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class CodeGenFunction;
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class CodeGenTypes;
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class SwiftABIInfo;
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namespace swiftcall {
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class SwiftAggLowering;
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}
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// FIXME: All of this stuff should be part of the target interface
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// somehow. It is currently here because it is not clear how to factor
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// the targets to support this, since the Targets currently live in a
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// layer below types n'stuff.
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/// ABIInfo - Target specific hooks for defining how a type should be
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/// passed or returned from functions.
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class ABIInfo {
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public:
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CodeGen::CodeGenTypes &CGT;
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protected:
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llvm::CallingConv::ID RuntimeCC;
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public:
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ABIInfo(CodeGen::CodeGenTypes &cgt)
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: CGT(cgt), RuntimeCC(llvm::CallingConv::C) {}
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virtual ~ABIInfo();
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virtual bool supportsSwift() const { return false; }
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CodeGen::CGCXXABI &getCXXABI() const;
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ASTContext &getContext() const;
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llvm::LLVMContext &getVMContext() const;
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const llvm::DataLayout &getDataLayout() const;
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const TargetInfo &getTarget() const;
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const CodeGenOptions &getCodeGenOpts() const;
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/// Return the calling convention to use for system runtime
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/// functions.
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llvm::CallingConv::ID getRuntimeCC() const {
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return RuntimeCC;
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}
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virtual void computeInfo(CodeGen::CGFunctionInfo &FI) const = 0;
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/// EmitVAArg - Emit the target dependent code to load a value of
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/// \arg Ty from the va_list pointed to by \arg VAListAddr.
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// FIXME: This is a gaping layering violation if we wanted to drop
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// the ABI information any lower than CodeGen. Of course, for
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// VAArg handling it has to be at this level; there is no way to
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// abstract this out.
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virtual CodeGen::Address EmitVAArg(CodeGen::CodeGenFunction &CGF,
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CodeGen::Address VAListAddr,
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QualType Ty) const = 0;
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bool isAndroid() const;
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/// Emit the target dependent code to load a value of
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/// \arg Ty from the \c __builtin_ms_va_list pointed to by \arg VAListAddr.
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virtual CodeGen::Address EmitMSVAArg(CodeGen::CodeGenFunction &CGF,
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CodeGen::Address VAListAddr,
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QualType Ty) const;
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virtual bool isHomogeneousAggregateBaseType(QualType Ty) const;
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virtual bool isHomogeneousAggregateSmallEnough(const Type *Base,
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uint64_t Members) const;
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bool isHomogeneousAggregate(QualType Ty, const Type *&Base,
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uint64_t &Members) const;
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/// A convenience method to return an indirect ABIArgInfo with an
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/// expected alignment equal to the ABI alignment of the given type.
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CodeGen::ABIArgInfo
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getNaturalAlignIndirect(QualType Ty, bool ByRef = true,
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bool Realign = false,
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llvm::Type *Padding = nullptr) const;
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CodeGen::ABIArgInfo
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getNaturalAlignIndirectInReg(QualType Ty, bool Realign = false) const;
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};
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/// A refining implementation of ABIInfo for targets that support swiftcall.
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///
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/// If we find ourselves wanting multiple such refinements, they'll probably
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/// be independent refinements, and we should probably find another way
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/// to do it than simple inheritance.
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class SwiftABIInfo : public ABIInfo {
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public:
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SwiftABIInfo(CodeGen::CodeGenTypes &cgt) : ABIInfo(cgt) {}
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bool supportsSwift() const final override { return true; }
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virtual bool shouldPassIndirectlyForSwift(ArrayRef<llvm::Type*> types,
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bool asReturnValue) const = 0;
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virtual bool isLegalVectorTypeForSwift(CharUnits totalSize,
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llvm::Type *eltTy,
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unsigned elts) const;
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virtual bool isSwiftErrorInRegister() const = 0;
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static bool classof(const ABIInfo *info) {
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return info->supportsSwift();
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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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