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/Support/CommandLine.h"
20#include "llvm/Support/FileSystem.h"
21#include "llvm/Support/MemoryBuffer.h"
22#include "llvm/Support/ToolOutputFile.h"
23#include "llvm/TableGen/Error.h"
24#include "llvm/TableGen/Main.h"
25#include "llvm/TableGen/Record.h"
26#include <algorithm>
27#include <cstdio>
28#include <system_error>
29using namespace llvm;
30
31namespace {
32  cl::opt<std::string>
33  OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"),
34                 cl::init("-"));
35
36  cl::opt<std::string>
37  DependFilename("d",
38                 cl::desc("Dependency filename"),
39                 cl::value_desc("filename"),
40                 cl::init(""));
41
42  cl::opt<std::string>
43  InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
44
45  cl::list<std::string>
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.
54static 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::error_code EC;
60  tool_output_file DepOut(DependFilename, EC, sys::fs::F_Text);
61  if (EC) {
62    errs() << argv0 << ": error opening " << DependFilename << ":"
63           << EC.message() << "\n";
64    return 1;
65  }
66  DepOut.os() << OutputFilename << ":";
67  for (const auto &Dep : Parser.getDependencies()) {
68    DepOut.os() << ' ' << Dep.first;
69  }
70  DepOut.os() << "\n";
71  DepOut.keep();
72  return 0;
73}
74
75namespace llvm {
76
77int TableGenMain(char *argv0, TableGenMainFn *MainFn) {
78  RecordKeeper Records;
79
80  // Parse the input file.
81  ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
82      MemoryBuffer::getFileOrSTDIN(InputFilename);
83  if (std::error_code EC = FileOrErr.getError()) {
84    errs() << "Could not open input file '" << InputFilename
85           << "': " << EC.message() << "\n";
86    return 1;
87  }
88
89  // Tell SrcMgr about this buffer, which is what TGParser will pick up.
90  SrcMgr.AddNewSourceBuffer(std::move(*FileOrErr), SMLoc());
91
92  // Record the location of the include directory so that the lexer can find
93  // it later.
94  SrcMgr.setIncludeDirs(IncludeDirs);
95
96  TGParser Parser(SrcMgr, Records);
97
98  if (Parser.ParseFile())
99    return 1;
100
101  std::error_code EC;
102  tool_output_file Out(OutputFilename, EC, sys::fs::F_Text);
103  if (EC) {
104    errs() << argv0 << ": error opening " << OutputFilename << ":"
105           << EC.message() << "\n";
106    return 1;
107  }
108  if (!DependFilename.empty()) {
109    if (int Ret = createDependencyFile(Parser, argv0))
110      return Ret;
111  }
112
113  if (MainFn(Out.os(), Records))
114    return 1;
115
116  if (ErrorsPrinted > 0) {
117    errs() << argv0 << ": " << ErrorsPrinted << " errors.\n";
118    return 1;
119  }
120
121  // Declare success.
122  Out.keep();
123  return 0;
124}
125
126}
127