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
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
//===--- TargetRegistry.cpp - Target registration -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/TargetRegistry.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <vector>
using namespace llvm;
// Clients are responsible for avoid race conditions in registration.
static Target *FirstTarget = 0;
TargetRegistry::iterator TargetRegistry::begin() {
return iterator(FirstTarget);
}
const Target *TargetRegistry::lookupTarget(const std::string &ArchName,
Triple &TheTriple,
std::string &Error) {
// Allocate target machine. First, check whether the user has explicitly
// specified an architecture to compile for. If so we have to look it up by
// name, because it might be a backend that has no mapping to a target triple.
const Target *TheTarget = 0;
if (!ArchName.empty()) {
for (TargetRegistry::iterator it = TargetRegistry::begin(),
ie = TargetRegistry::end(); it != ie; ++it) {
if (ArchName == it->getName()) {
TheTarget = &*it;
break;
}
}
if (!TheTarget) {
Error = "error: invalid target '" + ArchName + "'.\n";
return 0;
}
// Adjust the triple to match (if known), otherwise stick with the
// given triple.
Triple::ArchType Type = Triple::getArchTypeForLLVMName(ArchName);
if (Type != Triple::UnknownArch)
TheTriple.setArch(Type);
} else {
// Get the target specific parser.
std::string TempError;
TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), TempError);
if (TheTarget == 0) {
Error = ": error: unable to get target for '"
+ TheTriple.getTriple()
+ "', see --version and --triple.\n";
return 0;
}
}
return TheTarget;
}
const Target *TargetRegistry::lookupTarget(const std::string &TT,
std::string &Error) {
// Provide special warning when no targets are initialized.
if (begin() == end()) {
Error = "Unable to find target for this triple (no targets are registered)";
return 0;
}
const Target *Best = 0, *EquallyBest = 0;
unsigned BestQuality = 0;
for (iterator it = begin(), ie = end(); it != ie; ++it) {
if (unsigned Qual = it->TripleMatchQualityFn(TT)) {
if (!Best || Qual > BestQuality) {
Best = &*it;
EquallyBest = 0;
BestQuality = Qual;
} else if (Qual == BestQuality)
EquallyBest = &*it;
}
}
if (!Best) {
Error = "No available targets are compatible with this triple, "
"see -version for the available targets.";
return 0;
}
// Otherwise, take the best target, but make sure we don't have two equally
// good best targets.
if (EquallyBest) {
Error = std::string("Cannot choose between targets \"") +
Best->Name + "\" and \"" + EquallyBest->Name + "\"";
return 0;
}
return Best;
}
void TargetRegistry::RegisterTarget(Target &T,
const char *Name,
const char *ShortDesc,
Target::TripleMatchQualityFnTy TQualityFn,
bool HasJIT) {
assert(Name && ShortDesc && TQualityFn &&
"Missing required target information!");
// Check if this target has already been initialized, we allow this as a
// convenience to some clients.
if (T.Name)
return;
// Add to the list of targets.
T.Next = FirstTarget;
FirstTarget = &T;
T.Name = Name;
T.ShortDesc = ShortDesc;
T.TripleMatchQualityFn = TQualityFn;
T.HasJIT = HasJIT;
}
const Target *TargetRegistry::getClosestTargetForJIT(std::string &Error) {
const Target *TheTarget = lookupTarget(sys::getDefaultTargetTriple(), Error);
if (TheTarget && !TheTarget->hasJIT()) {
Error = "No JIT compatible target available for this host";
return 0;
}
return TheTarget;
}
static int TargetArraySortFn(const std::pair<StringRef, const Target *> *LHS,
const std::pair<StringRef, const Target *> *RHS) {
return LHS->first.compare(RHS->first);
}
void TargetRegistry::printRegisteredTargetsForVersion() {
std::vector<std::pair<StringRef, const Target*> > Targets;
size_t Width = 0;
for (TargetRegistry::iterator I = TargetRegistry::begin(),
E = TargetRegistry::end();
I != E; ++I) {
Targets.push_back(std::make_pair(I->getName(), &*I));
Width = std::max(Width, Targets.back().first.size());
}
array_pod_sort(Targets.begin(), Targets.end(), TargetArraySortFn);
raw_ostream &OS = outs();
OS << " Registered Targets:\n";
for (unsigned i = 0, e = Targets.size(); i != e; ++i) {
OS << " " << Targets[i].first;
OS.indent(Width - Targets[i].first.size()) << " - "
<< Targets[i].second->getShortDescription() << '\n';
}
if (Targets.empty())
OS << " (none)\n";
}
|
