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