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 CLANG_CODEGEN_ABIINFO_H 11 #define CLANG_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 CGCXXABI; 29 class CGFunctionInfo; 30 class CodeGenFunction; 31 class CodeGenTypes; 32 } 33 34 // FIXME: All of this stuff should be part of the target interface 35 // somehow. It is currently here because it is not clear how to factor 36 // the targets to support this, since the Targets currently live in a 37 // layer below types n'stuff. 38 39 40 /// ABIInfo - Target specific hooks for defining how a type should be 41 /// passed or returned from functions. 42 class ABIInfo { 43 public: 44 CodeGen::CodeGenTypes &CGT; 45 protected: 46 llvm::CallingConv::ID RuntimeCC; 47 public: 48 ABIInfo(CodeGen::CodeGenTypes &cgt) 49 : CGT(cgt), RuntimeCC(llvm::CallingConv::C) {} 50 51 virtual ~ABIInfo(); 52 53 CodeGen::CGCXXABI &getCXXABI() const; 54 ASTContext &getContext() const; 55 llvm::LLVMContext &getVMContext() const; 56 const llvm::DataLayout &getDataLayout() const; 57 const TargetInfo &getTarget() const; 58 59 /// Return the calling convention to use for system runtime 60 /// functions. 61 llvm::CallingConv::ID getRuntimeCC() const { 62 return RuntimeCC; 63 } 64 65 virtual void computeInfo(CodeGen::CGFunctionInfo &FI) const = 0; 66 67 /// EmitVAArg - Emit the target dependent code to load a value of 68 /// \arg Ty from the va_list pointed to by \arg VAListAddr. 69 70 // FIXME: This is a gaping layering violation if we wanted to drop 71 // the ABI information any lower than CodeGen. Of course, for 72 // VAArg handling it has to be at this level; there is no way to 73 // abstract this out. 74 virtual llvm::Value *EmitVAArg(llvm::Value *VAListAddr, QualType Ty, 75 CodeGen::CodeGenFunction &CGF) const = 0; 76 }; 77 } // end namespace clang 78 79 #endif 80
