TargetInfo.h revision d0b76ca10feefcfda5cb16698e50197e87a7d876 
1//===---- TargetInfo.h - Encapsulate target details -------------*- 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// These classes wrap the information about a call or function
11// definition used to handle ABI compliancy.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef CLANG_CODEGEN_TARGETINFO_H
16#define CLANG_CODEGEN_TARGETINFO_H
17
18namespace llvm {
19  class GlobalValue;
20}
21
22namespace clang {
23  class ABIInfo;
24  class Decl;
25
26  namespace CodeGen {
27    class CodeGenModule;
28  }
29
30  /// TargetCodeGenInfo - This class organizes various target-specific
31  /// codegeneration issues, like target-specific attributes, builtins and so
32  /// on.
33  class TargetCodeGenInfo {
34    ABIInfo *Info;
35  public:
36    // WARNING: Acquires the ownership of ABIInfo.
37    TargetCodeGenInfo(ABIInfo *info = 0):Info(info) { }
38    virtual ~TargetCodeGenInfo();
39
40    /// getABIInfo() - Returns ABI info helper for the target.
41    const ABIInfo& getABIInfo() const { return *Info; }
42
43    /// SetTargetAttributes - Provides a convenient hook to handle extra
44    /// target-specific attributes for the given global.
45    virtual void SetTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
46                                     CodeGen::CodeGenModule &M) const { }
47
48    /// Controls whether __builtin_extend_pointer should sign-extend
49    /// pointers to uint64_t or zero-extend them (the default).  Has
50    /// no effect for targets:
51    ///   - that have 64-bit pointers, or
52    ///   - that cannot address through registers larger than pointers, or
53    ///   - that implicitly ignore/truncate the top bits when addressing
54    ///     through such registers.
55    virtual bool extendPointerWithSExt() const { return false; }
56  };
57}
58
59#endif // CLANG_CODEGEN_TARGETINFO_H
60