• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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"
20 #include "llvm/Support/CommandLine.h"
21 #include "llvm/Support/MemoryBuffer.h"
22 #include "llvm/Support/ToolOutputFile.h"
23 #include "llvm/Support/system_error.h"
24 #include "llvm/TableGen/Error.h"
25 #include "llvm/TableGen/Record.h"
26 #include "llvm/TableGen/TableGenAction.h"
27 #include <algorithm>
28 #include <cstdio>
29 using namespace llvm;
30 
31 namespace {
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", cl::desc("Dependency filename"), cl::value_desc("filename"),
38                  cl::init(""));
39 
40   cl::opt<std::string>
41   InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
42 
43   cl::list<std::string>
44   IncludeDirs("I", cl::desc("Directory of include files"),
45               cl::value_desc("directory"), cl::Prefix);
46 }
47 
48 namespace llvm {
49 
TableGenMain(char * argv0,TableGenAction & Action)50 int TableGenMain(char *argv0, TableGenAction &Action) {
51   RecordKeeper Records;
52 
53   try {
54     // Parse the input file.
55     OwningPtr<MemoryBuffer> File;
56     if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFilename.c_str(), File)) {
57       errs() << "Could not open input file '" << InputFilename << "': "
58              << ec.message() <<"\n";
59       return 1;
60     }
61     MemoryBuffer *F = File.take();
62 
63     // Tell SrcMgr about this buffer, which is what TGParser will pick up.
64     SrcMgr.AddNewSourceBuffer(F, SMLoc());
65 
66     // Record the location of the include directory so that the lexer can find
67     // it later.
68     SrcMgr.setIncludeDirs(IncludeDirs);
69 
70     TGParser Parser(SrcMgr, Records);
71 
72     if (Parser.ParseFile())
73       return 1;
74 
75     std::string Error;
76     tool_output_file Out(OutputFilename.c_str(), Error);
77     if (!Error.empty()) {
78       errs() << argv0 << ": error opening " << OutputFilename
79         << ":" << Error << "\n";
80       return 1;
81     }
82     if (!DependFilename.empty()) {
83       if (OutputFilename == "-") {
84         errs() << argv0 << ": the option -d must be used together with -o\n";
85         return 1;
86       }
87       tool_output_file DepOut(DependFilename.c_str(), Error);
88       if (!Error.empty()) {
89         errs() << argv0 << ": error opening " << DependFilename
90           << ":" << Error << "\n";
91         return 1;
92       }
93       DepOut.os() << OutputFilename << ":";
94       const std::vector<std::string> &Dependencies = Parser.getDependencies();
95       for (std::vector<std::string>::const_iterator I = Dependencies.begin(),
96                                                           E = Dependencies.end();
97            I != E; ++I) {
98         DepOut.os() << " " << (*I);
99       }
100       DepOut.os() << "\n";
101       DepOut.keep();
102     }
103 
104     if (Action(Out.os(), Records))
105       return 1;
106 
107     // Declare success.
108     Out.keep();
109     return 0;
110 
111   } catch (const TGError &Error) {
112     PrintError(Error);
113   } catch (const std::string &Error) {
114     PrintError(Error);
115   } catch (const char *Error) {
116     PrintError(Error);
117   } catch (...) {
118     errs() << argv0 << ": Unknown unexpected exception occurred.\n";
119   }
120 
121   return 1;
122 }
123 
124 }
125