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>
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",
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.
createDependencyFile(const TGParser & Parser,const char * argv0)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, sys::fs::F_Text);
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
TableGenMain(char * argv0,TableGenMainFn * MainFn)80 int TableGenMain(char *argv0, TableGenMainFn *MainFn) {
81 RecordKeeper Records;
82
83 // Parse the input file.
84 ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
85 MemoryBuffer::getFileOrSTDIN(InputFilename);
86 if (std::error_code EC = FileOrErr.getError()) {
87 errs() << "Could not open input file '" << InputFilename
88 << "': " << EC.message() << "\n";
89 return 1;
90 }
91 MemoryBuffer *F = FileOrErr.get().release();
92
93 // Tell SrcMgr about this buffer, which is what TGParser will pick up.
94 SrcMgr.AddNewSourceBuffer(F, SMLoc());
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, sys::fs::F_Text);
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 }
131