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