LLVM  3.7.0
TargetRegistry.cpp
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1 //===--- TargetRegistry.cpp - Target registration -------------------------===//
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 
11 #include "llvm/ADT/STLExtras.h"
12 #include "llvm/ADT/StringRef.h"
14 #include <cassert>
15 #include <vector>
16 using namespace llvm;
17 
18 // Clients are responsible for avoid race conditions in registration.
19 static Target *FirstTarget = nullptr;
20 
23 }
24 
25 const Target *TargetRegistry::lookupTarget(const std::string &ArchName,
26  Triple &TheTriple,
27  std::string &Error) {
28  // Allocate target machine. First, check whether the user has explicitly
29  // specified an architecture to compile for. If so we have to look it up by
30  // name, because it might be a backend that has no mapping to a target triple.
31  const Target *TheTarget = nullptr;
32  if (!ArchName.empty()) {
33  auto I =
34  std::find_if(targets().begin(), targets().end(),
35  [&](const Target &T) { return ArchName == T.getName(); });
36 
37  if (I == targets().end()) {
38  Error = "error: invalid target '" + ArchName + "'.\n";
39  return nullptr;
40  }
41 
42  TheTarget = &*I;
43 
44  // Adjust the triple to match (if known), otherwise stick with the
45  // given triple.
47  if (Type != Triple::UnknownArch)
48  TheTriple.setArch(Type);
49  } else {
50  // Get the target specific parser.
51  std::string TempError;
52  TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), TempError);
53  if (!TheTarget) {
54  Error = ": error: unable to get target for '"
55  + TheTriple.getTriple()
56  + "', see --version and --triple.\n";
57  return nullptr;
58  }
59  }
60 
61  return TheTarget;
62 }
63 
64 const Target *TargetRegistry::lookupTarget(const std::string &TT,
65  std::string &Error) {
66  // Provide special warning when no targets are initialized.
67  if (targets().begin() == targets().end()) {
68  Error = "Unable to find target for this triple (no targets are registered)";
69  return nullptr;
70  }
71  Triple::ArchType Arch = Triple(TT).getArch();
72  auto ArchMatch = [&](const Target &T) { return T.ArchMatchFn(Arch); };
73  auto I = std::find_if(targets().begin(), targets().end(), ArchMatch);
74 
75  if (I == targets().end()) {
76  Error = "No available targets are compatible with this triple, "
77  "see -version for the available targets.";
78  return nullptr;
79  }
80 
81  auto J = std::find_if(std::next(I), targets().end(), ArchMatch);
82  if (J != targets().end()) {
83  Error = std::string("Cannot choose between targets \"") + I->Name +
84  "\" and \"" + J->Name + "\"";
85  return nullptr;
86  }
87 
88  return &*I;
89 }
90 
92  const char *Name,
93  const char *ShortDesc,
94  Target::ArchMatchFnTy ArchMatchFn,
95  bool HasJIT) {
96  assert(Name && ShortDesc && ArchMatchFn &&
97  "Missing required target information!");
98 
99  // Check if this target has already been initialized, we allow this as a
100  // convenience to some clients.
101  if (T.Name)
102  return;
103 
104  // Add to the list of targets.
105  T.Next = FirstTarget;
106  FirstTarget = &T;
107 
108  T.Name = Name;
109  T.ShortDesc = ShortDesc;
110  T.ArchMatchFn = ArchMatchFn;
111  T.HasJIT = HasJIT;
112 }
113 
114 static int TargetArraySortFn(const std::pair<StringRef, const Target *> *LHS,
115  const std::pair<StringRef, const Target *> *RHS) {
116  return LHS->first.compare(RHS->first);
117 }
118 
120  std::vector<std::pair<StringRef, const Target*> > Targets;
121  size_t Width = 0;
122  for (const auto &T : TargetRegistry::targets()) {
123  Targets.push_back(std::make_pair(T.getName(), &T));
124  Width = std::max(Width, Targets.back().first.size());
125  }
126  array_pod_sort(Targets.begin(), Targets.end(), TargetArraySortFn);
127 
128  raw_ostream &OS = outs();
129  OS << " Registered Targets:\n";
130  for (unsigned i = 0, e = Targets.size(); i != e; ++i) {
131  OS << " " << Targets[i].first;
132  OS.indent(Width - Targets[i].first.size()) << " - "
133  << Targets[i].second->getShortDescription() << '\n';
134  }
135  if (Targets.empty())
136  OS << " (none)\n";
137 }
const_iterator end(StringRef path)
Get end iterator over path.
Definition: Path.cpp:240
const char * getName() const
getName - Get the target name.
static int TargetArraySortFn(const std::pair< StringRef, const Target * > *LHS, const std::pair< StringRef, const Target * > *RHS)
const_iterator begin(StringRef path)
Get begin iterator over path.
Definition: Path.cpp:232
static const Target * lookupTarget(const std::string &Triple, std::string &Error)
lookupTarget - Lookup a target based on a target triple.
#define T
static void RegisterTarget(Target &T, const char *Name, const char *ShortDesc, Target::ArchMatchFnTy ArchMatchFn, bool HasJIT=false)
RegisterTarget - Register the given target.
ArchType getArch() const
getArch - Get the parsed architecture type of this triple.
Definition: Triple.h:242
static iterator_range< iterator > targets()
raw_ostream & outs()
This returns a reference to a raw_ostream for standard output.
void array_pod_sort(IteratorTy Start, IteratorTy End)
array_pod_sort - This sorts an array with the specified start and end extent.
Definition: STLExtras.h:287
static void printRegisteredTargetsForVersion()
printRegisteredTargetsForVersion - Print the registered targets appropriately for inclusion in a tool...
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:45
const std::string & getTriple() const
Definition: Triple.h:308
bool(* ArchMatchFnTy)(Triple::ArchType Arch)
static Target * FirstTarget
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
iterator_range< T > make_range(T x, T y)
Convenience function for iterating over sub-ranges.
static ArchType getArchTypeForLLVMName(StringRef Str)
getArchTypeForLLVMName - The canonical type for the given LLVM architecture name (e.g., "x86").
Definition: Triple.cpp:219
A range adaptor for a pair of iterators.
Target - Wrapper for Target specific information.
#define I(x, y, z)
Definition: MD5.cpp:54
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:38
void setArch(ArchType Kind)
setArch - Set the architecture (first) component of the triple to a known type.
Definition: Triple.cpp:931