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ebc7c74f2f
Removes one subprocess and one temp file from the build for each tablegen invocation. No intended behavior change. https://reviews.llvm.org/D45899 llvm-svn: 330742
130 lines
4.2 KiB
C++
130 lines
4.2 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 "llvm/TableGen/Main.h"
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#include "TGParser.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FileSystem.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/TableGen/Error.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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#include <system_error>
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using namespace llvm;
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static 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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static 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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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
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static 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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static int reportError(const char *ProgName, Twine Msg) {
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errs() << ProgName << ": " << Msg;
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errs().flush();
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return 1;
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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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return reportError(argv0, "the option -d must be used together with -o\n");
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std::error_code EC;
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ToolOutputFile DepOut(DependFilename, EC, sys::fs::F_Text);
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if (EC)
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return reportError(argv0, "error opening " + DependFilename + ":" +
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EC.message() + "\n");
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DepOut.os() << OutputFilename << ":";
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for (const auto &Dep : Parser.getDependencies()) {
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DepOut.os() << ' ' << Dep.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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int llvm::TableGenMain(char *argv0, TableGenMainFn *MainFn) {
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RecordKeeper Records;
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// Parse the input file.
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ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
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MemoryBuffer::getFileOrSTDIN(InputFilename);
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if (std::error_code EC = FileOrErr.getError())
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return reportError(argv0, "Could not open input file '" + InputFilename +
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"': " + EC.message() + "\n");
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// Tell SrcMgr about this buffer, which is what TGParser will pick up.
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SrcMgr.AddNewSourceBuffer(std::move(*FileOrErr), 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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// Write output to memory.
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std::string OutString;
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raw_string_ostream Out(OutString);
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if (MainFn(Out, Records))
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return 1;
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// Only updates the real output file if there are any differences.
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// This prevents recompilation of all the files depending on it if there
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// aren't any.
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if (auto ExistingOrErr = MemoryBuffer::getFile(OutputFilename))
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if (std::move(ExistingOrErr.get())->getBuffer() == Out.str())
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return 0;
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std::error_code EC;
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ToolOutputFile OutFile(OutputFilename, EC, sys::fs::F_Text);
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if (EC)
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return reportError(argv0, "error opening " + OutputFilename + ":" +
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EC.message() + "\n");
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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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OutFile.os() << Out.str();
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if (ErrorsPrinted > 0)
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return reportError(argv0, Twine(ErrorsPrinted) + " errors.\n");
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// Declare success.
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OutFile.keep();
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return 0;
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}
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