Home | History | Annotate | Download | only in TableGen 
      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 
     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