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Main.cpp
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1 //===- Main.cpp - Top-Level TableGen implementation -----------------------===//
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 // TableGen is a tool which can be used to build up a description of something,
11 // then invoke one or more "tablegen backends" to emit information about the
12 // description in some predefined format. In practice, this is used by the LLVM
13 // code generators to automate generation of a code generator through a
14 // high-level description of the target.
15 //
16 //===----------------------------------------------------------------------===//
17 
18 #include "TGParser.h"
19 #include "llvm/ADT/OwningPtr.h"
24 #include "llvm/TableGen/Error.h"
25 #include "llvm/TableGen/Main.h"
26 #include "llvm/TableGen/Record.h"
27 #include <algorithm>
28 #include <cstdio>
29 using namespace llvm;
30 
31 namespace {
33  OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"),
34  cl::init("-"));
35 
37  DependFilename("d",
38  cl::desc("Dependency filename"),
39  cl::value_desc("filename"),
40  cl::init(""));
41 
43  InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
44 
46  IncludeDirs("I", cl::desc("Directory of include files"),
47  cl::value_desc("directory"), cl::Prefix);
48 }
49 
50 /// \brief Create a dependency file for `-d` option.
51 ///
52 /// This functionality is really only for the benefit of the build system.
53 /// It is similar to GCC's `-M*` family of options.
54 static int createDependencyFile(const TGParser &Parser, const char *argv0) {
55  if (OutputFilename == "-") {
56  errs() << argv0 << ": the option -d must be used together with -o\n";
57  return 1;
58  }
59  std::string Error;
60  tool_output_file DepOut(DependFilename.c_str(), Error);
61  if (!Error.empty()) {
62  errs() << argv0 << ": error opening " << DependFilename
63  << ":" << Error << "\n";
64  return 1;
65  }
66  DepOut.os() << OutputFilename << ":";
67  const TGLexer::DependenciesMapTy &Dependencies = Parser.getDependencies();
68  for (TGLexer::DependenciesMapTy::const_iterator I = Dependencies.begin(),
69  E = Dependencies.end();
70  I != E; ++I) {
71  DepOut.os() << " " << I->first;
72  }
73  DepOut.os() << "\n";
74  DepOut.keep();
75  return 0;
76 }
77 
78 namespace llvm {
79 
80 int TableGenMain(char *argv0, TableGenMainFn *MainFn) {
81  RecordKeeper Records;
82 
83  // Parse the input file.
85  if (error_code ec =
86  MemoryBuffer::getFileOrSTDIN(InputFilename, File)) {
87  errs() << "Could not open input file '" << InputFilename << "': "
88  << ec.message() <<"\n";
89  return 1;
90  }
91  MemoryBuffer *F = File.take();
92 
93  // Tell SrcMgr about this buffer, which is what TGParser will pick up.
95 
96  // Record the location of the include directory so that the lexer can find
97  // it later.
98  SrcMgr.setIncludeDirs(IncludeDirs);
99 
100  TGParser Parser(SrcMgr, Records);
101 
102  if (Parser.ParseFile())
103  return 1;
104 
105  std::string Error;
106  tool_output_file Out(OutputFilename.c_str(), Error);
107  if (!Error.empty()) {
108  errs() << argv0 << ": error opening " << OutputFilename
109  << ":" << Error << "\n";
110  return 1;
111  }
112  if (!DependFilename.empty()) {
113  if (int Ret = createDependencyFile(Parser, argv0))
114  return Ret;
115  }
116 
117  if (MainFn(Out.os(), Records))
118  return 1;
119 
120  if (ErrorsPrinted > 0) {
121  errs() << argv0 << ": " << ErrorsPrinted << " errors.\n";
122  return 1;
123  }
124 
125  // Declare success.
126  Out.keep();
127  return 0;
128 }
129 
130 }
raw_ostream & errs()
SourceMgr SrcMgr
F(f)
unsigned ErrorsPrinted
bool TableGenMainFn(raw_ostream &OS, RecordKeeper &Records)
Perform the action using Records, and write output to OS.
Definition: Main.h:23
static error_code getFileOrSTDIN(StringRef Filename, OwningPtr< MemoryBuffer > &result, int64_t FileSize=-1)
initializer< Ty > init(const Ty &Val)
Definition: CommandLine.h:314
const TGLexer::DependenciesMapTy & getDependencies() const
Definition: TGParser.h:99
int TableGenMain(char *argv0, TableGenMainFn *MainFn)
Definition: Main.cpp:80
std::map< std::string, SMLoc > DependenciesMapTy
Definition: TGLexer.h:79
#define I(x, y, z)
Definition: MD5.cpp:54
void setIncludeDirs(const std::vector< std::string > &Dirs)
Definition: SourceMgr.h:77
static int createDependencyFile(const TGParser &Parser, const char *argv0)
Create a dependency file for -d option.
Definition: Main.cpp:54
Represents a location in source code.
Definition: SMLoc.h:23
size_t AddNewSourceBuffer(MemoryBuffer *F, SMLoc IncludeLoc)
Definition: SourceMgr.h:112