1 //===- Main.cpp - Top-Level TableGen implementation -----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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.
16 //===----------------------------------------------------------------------===//
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/Main.h"
26 #include "llvm/TableGen/Record.h"
27 #include "llvm/TableGen/TableGenAction.h"
34 OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"),
39 cl::desc("Dependency filename"),
40 cl::value_desc("filename"),
44 InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
47 IncludeDirs("I", cl::desc("Directory of include files"),
48 cl::value_desc("directory"), cl::Prefix);
52 // XXX: this is a crutch for transitioning to the new TableGenMain API
53 // (with a TableGenMainFn* instead of a pointless class).
54 class StubTransitionalTableGenAction : public TableGenAction {
55 TableGenMainFn *MainFn;
57 StubTransitionalTableGenAction(TableGenMainFn *M) : MainFn(M) {}
58 bool operator()(raw_ostream &OS, RecordKeeper &Records) {
59 return MainFn(OS, Records);
66 int TableGenMain(char *argv0, TableGenMainFn *MainFn) {
67 StubTransitionalTableGenAction Action(MainFn);
68 return TableGenMain(argv0, Action);
71 int TableGenMain(char *argv0, TableGenAction &Action) {
75 // Parse the input file.
76 OwningPtr<MemoryBuffer> File;
78 MemoryBuffer::getFileOrSTDIN(InputFilename.c_str(), File)) {
79 errs() << "Could not open input file '" << InputFilename << "': "
80 << ec.message() <<"\n";
83 MemoryBuffer *F = File.take();
85 // Tell SrcMgr about this buffer, which is what TGParser will pick up.
86 SrcMgr.AddNewSourceBuffer(F, SMLoc());
88 // Record the location of the include directory so that the lexer can find
90 SrcMgr.setIncludeDirs(IncludeDirs);
92 TGParser Parser(SrcMgr, Records);
94 if (Parser.ParseFile())
98 tool_output_file Out(OutputFilename.c_str(), Error);
100 errs() << argv0 << ": error opening " << OutputFilename
101 << ":" << Error << "\n";
104 if (!DependFilename.empty()) {
105 if (OutputFilename == "-") {
106 errs() << argv0 << ": the option -d must be used together with -o\n";
109 tool_output_file DepOut(DependFilename.c_str(), Error);
110 if (!Error.empty()) {
111 errs() << argv0 << ": error opening " << DependFilename
112 << ":" << Error << "\n";
115 DepOut.os() << OutputFilename << ":";
116 const std::vector<std::string> &Dependencies = Parser.getDependencies();
117 for (std::vector<std::string>::const_iterator I = Dependencies.begin(),
118 E = Dependencies.end();
120 DepOut.os() << " " << (*I);
126 if (Action(Out.os(), Records))
133 } catch (const TGError &Error) {
135 } catch (const std::string &Error) {
137 } catch (const char *Error) {
140 errs() << argv0 << ": Unknown unexpected exception occurred.\n";