1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
//===---- TargetInfo.h - Encapsulate target details -------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// These classes wrap the information about a call or function
// definition used to handle ABI compliancy.
//
//===----------------------------------------------------------------------===//
#ifndef CLANG_CODEGEN_TARGETINFO_H
#define CLANG_CODEGEN_TARGETINFO_H
#include "llvm/ADT/StringRef.h"
namespace llvm {
class GlobalValue;
class Type;
class Value;
}
namespace clang {
class ABIInfo;
class Decl;
namespace CodeGen {
class CodeGenModule;
class CodeGenFunction;
}
/// TargetCodeGenInfo - This class organizes various target-specific
/// codegeneration issues, like target-specific attributes, builtins and so
/// on.
class TargetCodeGenInfo {
ABIInfo *Info;
public:
// WARNING: Acquires the ownership of ABIInfo.
TargetCodeGenInfo(ABIInfo *info = 0):Info(info) { }
virtual ~TargetCodeGenInfo();
/// getABIInfo() - Returns ABI info helper for the target.
const ABIInfo& getABIInfo() const { return *Info; }
/// SetTargetAttributes - Provides a convenient hook to handle extra
/// target-specific attributes for the given global.
virtual void SetTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
CodeGen::CodeGenModule &M) const { }
/// Determines the size of struct _Unwind_Exception on this platform,
/// in 8-bit units. The Itanium ABI defines this as:
/// struct _Unwind_Exception {
/// uint64 exception_class;
/// _Unwind_Exception_Cleanup_Fn exception_cleanup;
/// uint64 private_1;
/// uint64 private_2;
/// };
unsigned getSizeOfUnwindException() const { return 32; }
/// Controls whether __builtin_extend_pointer should sign-extend
/// pointers to uint64_t or zero-extend them (the default). Has
/// no effect for targets:
/// - that have 64-bit pointers, or
/// - that cannot address through registers larger than pointers, or
/// - that implicitly ignore/truncate the top bits when addressing
/// through such registers.
virtual bool extendPointerWithSExt() const { return false; }
/// Determines the DWARF register number for the stack pointer, for
/// exception-handling purposes. Implements __builtin_dwarf_sp_column.
///
/// Returns -1 if the operation is unsupported by this target.
virtual int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const {
return -1;
}
/// Initializes the given DWARF EH register-size table, a char*.
/// Implements __builtin_init_dwarf_reg_size_table.
///
/// Returns true if the operation is unsupported by this target.
virtual bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
llvm::Value *Address) const {
return true;
}
/// Performs the code-generation required to convert a return
/// address as stored by the system into the actual address of the
/// next instruction that will be executed.
///
/// Used by __builtin_extract_return_addr().
virtual llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF,
llvm::Value *Address) const {
return Address;
}
/// Performs the code-generation required to convert the address
/// of an instruction into a return address suitable for storage
/// by the system in a return slot.
///
/// Used by __builtin_frob_return_addr().
virtual llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF,
llvm::Value *Address) const {
return Address;
}
virtual const llvm::Type* adjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
llvm::StringRef Constraint,
const llvm::Type* Ty) const {
return Ty;
}
};
}
#endif // CLANG_CODEGEN_TARGETINFO_H
|
