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
118
119
120
121
122
123
|
//===-- llvm/Target/TargetLibraryInfo.h - Library information ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETLIBRARYINFO_H
#define LLVM_TARGET_TARGETLIBRARYINFO_H
#include "llvm/Pass.h"
#include "llvm/ADT/DenseMap.h"
namespace llvm {
class Triple;
namespace LibFunc {
enum Func {
/// void *memset(void *b, int c, size_t len);
memset,
// void *memcpy(void *s1, const void *s2, size_t n);
memcpy,
// void *memmove(void *s1, const void *s2, size_t n);
memmove,
/// void memset_pattern16(void *b, const void *pattern16, size_t len);
memset_pattern16,
/// int iprintf(const char *format, ...);
iprintf,
/// int siprintf(char *str, const char *format, ...);
siprintf,
/// int fiprintf(FILE *stream, const char *format, ...);
fiprintf,
// size_t fwrite(const void *ptr, size_t size, size_t nitems,
// FILE *stream);
fwrite,
// int fputs(const char *s, FILE *stream);
fputs,
NumLibFuncs
};
}
/// TargetLibraryInfo - This immutable pass captures information about what
/// library functions are available for the current target, and allows a
/// frontend to disable optimizations through -fno-builtin etc.
class TargetLibraryInfo : public ImmutablePass {
unsigned char AvailableArray[(LibFunc::NumLibFuncs+3)/4];
llvm::DenseMap<unsigned, std::string> CustomNames;
static const char* StandardNames[LibFunc::NumLibFuncs];
enum AvailabilityState {
StandardName = 3, // (memset to all ones)
CustomName = 1,
Unavailable = 0 // (memset to all zeros)
};
void setState(LibFunc::Func F, AvailabilityState State) {
AvailableArray[F/4] &= ~(3 << 2*(F&3));
AvailableArray[F/4] |= State << 2*(F&3);
}
AvailabilityState getState(LibFunc::Func F) const {
return static_cast<AvailabilityState>((AvailableArray[F/4] >> 2*(F&3)) & 3);
}
public:
static char ID;
TargetLibraryInfo();
TargetLibraryInfo(const Triple &T);
explicit TargetLibraryInfo(const TargetLibraryInfo &TLI);
/// has - This function is used by optimizations that want to match on or form
/// a given library function.
bool has(LibFunc::Func F) const {
return getState(F) != Unavailable;
}
StringRef getName(LibFunc::Func F) const {
AvailabilityState State = getState(F);
if (State == Unavailable)
return StringRef();
if (State == StandardName)
return StandardNames[F];
assert(State == CustomName);
return CustomNames.find(F)->second;
}
/// setUnavailable - this can be used by whatever sets up TargetLibraryInfo to
/// ban use of specific library functions.
void setUnavailable(LibFunc::Func F) {
setState(F, Unavailable);
}
void setAvailable(LibFunc::Func F) {
setState(F, StandardName);
}
void setAvailableWithName(LibFunc::Func F, StringRef Name) {
if (StandardNames[F] != Name) {
setState(F, CustomName);
CustomNames[F] = Name;
assert(CustomNames.find(F) != CustomNames.end());
} else {
setState(F, StandardName);
}
}
/// disableAllFunctions - This disables all builtins, which is used for
/// options like -fno-builtin.
void disableAllFunctions();
};
} // end namespace llvm
#endif
|
