1 //===----- ABIInfo.h - ABI information access & encapsulation ---*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef LLVM_CLANG_LIB_CODEGEN_ABIINFO_H 11 #define LLVM_CLANG_LIB_CODEGEN_ABIINFO_H 12 13 #include "clang/AST/Type.h" 14 #include "llvm/IR/CallingConv.h" 15 #include "llvm/IR/Type.h" 16 17 namespace llvm { 18 class Value; 19 class LLVMContext; 20 class DataLayout; 21 } 22 23 namespace clang { 24 class ASTContext; 25 class TargetInfo; 26 27 namespace CodeGen { 28 class ABIArgInfo; 29 class Address; 30 class CGCXXABI; 31 class CGFunctionInfo; 32 class CodeGenFunction; 33 class CodeGenTypes; 34 } 35 36 // FIXME: All of this stuff should be part of the target interface 37 // somehow. It is currently here because it is not clear how to factor 38 // the targets to support this, since the Targets currently live in a 39 // layer below types n'stuff. 40 41 42 /// ABIInfo - Target specific hooks for defining how a type should be 43 /// passed or returned from functions. 44 class ABIInfo { 45 public: 46 CodeGen::CodeGenTypes &CGT; 47 protected: 48 llvm::CallingConv::ID RuntimeCC; 49 llvm::CallingConv::ID BuiltinCC; 50 public: ABIInfo(CodeGen::CodeGenTypes & cgt)51 ABIInfo(CodeGen::CodeGenTypes &cgt) 52 : CGT(cgt), 53 RuntimeCC(llvm::CallingConv::C), 54 BuiltinCC(llvm::CallingConv::C) {} 55 56 virtual ~ABIInfo(); 57 58 CodeGen::CGCXXABI &getCXXABI() const; 59 ASTContext &getContext() const; 60 llvm::LLVMContext &getVMContext() const; 61 const llvm::DataLayout &getDataLayout() const; 62 const TargetInfo &getTarget() const; 63 64 /// Return the calling convention to use for system runtime 65 /// functions. getRuntimeCC()66 llvm::CallingConv::ID getRuntimeCC() const { 67 return RuntimeCC; 68 } 69 70 /// Return the calling convention to use for compiler builtins getBuiltinCC()71 llvm::CallingConv::ID getBuiltinCC() const { 72 return BuiltinCC; 73 } 74 75 virtual void computeInfo(CodeGen::CGFunctionInfo &FI) const = 0; 76 77 /// EmitVAArg - Emit the target dependent code to load a value of 78 /// \arg Ty from the va_list pointed to by \arg VAListAddr. 79 80 // FIXME: This is a gaping layering violation if we wanted to drop 81 // the ABI information any lower than CodeGen. Of course, for 82 // VAArg handling it has to be at this level; there is no way to 83 // abstract this out. 84 virtual CodeGen::Address EmitVAArg(CodeGen::CodeGenFunction &CGF, 85 CodeGen::Address VAListAddr, 86 QualType Ty) const = 0; 87 88 /// Emit the target dependent code to load a value of 89 /// \arg Ty from the \c __builtin_ms_va_list pointed to by \arg VAListAddr. 90 virtual CodeGen::Address EmitMSVAArg(CodeGen::CodeGenFunction &CGF, 91 CodeGen::Address VAListAddr, 92 QualType Ty) const; 93 94 virtual bool isHomogeneousAggregateBaseType(QualType Ty) const; 95 96 virtual bool isHomogeneousAggregateSmallEnough(const Type *Base, 97 uint64_t Members) const; 98 99 virtual bool shouldSignExtUnsignedType(QualType Ty) const; 100 101 bool isHomogeneousAggregate(QualType Ty, const Type *&Base, 102 uint64_t &Members) const; 103 104 /// A convenience method to return an indirect ABIArgInfo with an 105 /// expected alignment equal to the ABI alignment of the given type. 106 CodeGen::ABIArgInfo 107 getNaturalAlignIndirect(QualType Ty, bool ByRef = true, 108 bool Realign = false, 109 llvm::Type *Padding = nullptr) const; 110 111 CodeGen::ABIArgInfo 112 getNaturalAlignIndirectInReg(QualType Ty, bool Realign = false) const; 113 }; 114 } // end namespace clang 115 116 #endif 117