ABIInfo.h revision 263508 
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/Type.h"
15#include "llvm/IR/CallingConv.h"
16
17namespace llvm {
18  class Value;
19  class LLVMContext;
20  class DataLayout;
21}
22
23namespace 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