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//===- Main.cpp - Top-Level TableGen implementation -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// TableGen is a tool which can be used to build up a description of something,
// then invoke one or more "tablegen backends" to emit information about the
// description in some predefined format. In practice, this is used by the LLVM
// code generators to automate generation of a code generator through a
// high-level description of the target.
//
//===----------------------------------------------------------------------===//
#include "llvm/TableGen/Main.h"
#include "TGParser.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/Record.h"
#include <algorithm>
#include <cstdio>
#include <system_error>
using namespace llvm;
static cl::opt<std::string>
OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"),
cl::init("-"));
static cl::opt<std::string>
DependFilename("d",
cl::desc("Dependency filename"),
cl::value_desc("filename"),
cl::init(""));
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
static cl::list<std::string>
IncludeDirs("I", cl::desc("Directory of include files"),
cl::value_desc("directory"), cl::Prefix);
static int reportError(const char *ProgName, Twine Msg) {
errs() << ProgName << ": " << Msg;
errs().flush();
return 1;
}
/// \brief Create a dependency file for `-d` option.
///
/// This functionality is really only for the benefit of the build system.
/// It is similar to GCC's `-M*` family of options.
static int createDependencyFile(const TGParser &Parser, const char *argv0) {
if (OutputFilename == "-")
return reportError(argv0, "the option -d must be used together with -o\n");
std::error_code EC;
ToolOutputFile DepOut(DependFilename, EC, sys::fs::F_Text);
if (EC)
return reportError(argv0, "error opening " + DependFilename + ":" +
EC.message() + "\n");
DepOut.os() << OutputFilename << ":";
for (const auto &Dep : Parser.getDependencies()) {
DepOut.os() << ' ' << Dep.first;
}
DepOut.os() << "\n";
DepOut.keep();
return 0;
}
int llvm::TableGenMain(char *argv0, TableGenMainFn *MainFn) {
RecordKeeper Records;
// Parse the input file.
ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
MemoryBuffer::getFileOrSTDIN(InputFilename);
if (std::error_code EC = FileOrErr.getError())
return reportError(argv0, "Could not open input file '" + InputFilename +
"': " + EC.message() + "\n");
// Tell SrcMgr about this buffer, which is what TGParser will pick up.
SrcMgr.AddNewSourceBuffer(std::move(*FileOrErr), SMLoc());
// Record the location of the include directory so that the lexer can find
// it later.
SrcMgr.setIncludeDirs(IncludeDirs);
TGParser Parser(SrcMgr, Records);
if (Parser.ParseFile())
return 1;
std::error_code EC;
ToolOutputFile Out(OutputFilename, EC, sys::fs::F_Text);
if (EC)
return reportError(argv0, "error opening " + OutputFilename + ":" +
EC.message() + "\n");
if (!DependFilename.empty()) {
if (int Ret = createDependencyFile(Parser, argv0))
return Ret;
}
if (MainFn(Out.os(), Records))
return 1;
if (ErrorsPrinted > 0)
return reportError(argv0, utostr(ErrorsPrinted) + " errors.\n");
// Declare success.
Out.keep();
return 0;
}
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