144 lines
4.4 KiB
C++
144 lines
4.4 KiB
C++
//===- yaml2obj - Convert YAML to a binary object file --------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This program takes a YAML description of an object file and outputs the
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// binary equivalent.
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//
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// This is used for writing tests that require binary files.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ObjectYAML/yaml2obj.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ObjectYAML/ObjectYAML.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/InitLLVM.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/WithColor.h"
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#include "llvm/Support/YAMLTraits.h"
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#include "llvm/Support/raw_ostream.h"
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#include <system_error>
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using namespace llvm;
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namespace {
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cl::OptionCategory Cat("yaml2obj Options");
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cl::opt<std::string> Input(cl::Positional, cl::desc("<input file>"),
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cl::init("-"), cl::cat(Cat));
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cl::list<std::string>
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D("D", cl::Prefix,
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cl::desc("Defined the specified macros to their specified "
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"definition. The syntax is <macro>=<definition>"));
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cl::opt<unsigned>
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DocNum("docnum", cl::init(1),
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cl::desc("Read specified document from input (default = 1)"),
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cl::cat(Cat));
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static cl::opt<uint64_t> MaxSize(
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"max-size", cl::init(10 * 1024 * 1024),
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cl::desc(
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"Sets the maximum allowed output size (0 means no limit) [ELF only]"));
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cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"),
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cl::value_desc("filename"), cl::init("-"),
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cl::Prefix, cl::cat(Cat));
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} // namespace
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static Optional<std::string> preprocess(StringRef Buf,
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yaml::ErrorHandler ErrHandler) {
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DenseMap<StringRef, StringRef> Defines;
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for (StringRef Define : D) {
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StringRef Macro, Definition;
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std::tie(Macro, Definition) = Define.split('=');
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if (!Define.count('=') || Macro.empty()) {
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ErrHandler("invalid syntax for -D: " + Define);
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return {};
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}
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if (!Defines.try_emplace(Macro, Definition).second) {
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ErrHandler("'" + Macro + "'" + " redefined");
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return {};
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}
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}
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std::string Preprocessed;
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while (!Buf.empty()) {
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if (Buf.startswith("[[")) {
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size_t I = Buf.find_first_of("[]", 2);
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if (Buf.substr(I).startswith("]]")) {
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StringRef MacroExpr = Buf.substr(2, I - 2);
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StringRef Macro;
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StringRef Default;
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std::tie(Macro, Default) = MacroExpr.split('=');
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// When the -D option is requested, we use the provided value.
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// Otherwise we use a default macro value if present.
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auto It = Defines.find(Macro);
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Optional<StringRef> Value;
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if (It != Defines.end())
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Value = It->second;
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else if (!Default.empty() || MacroExpr.endswith("="))
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Value = Default;
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if (Value) {
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Preprocessed += *Value;
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Buf = Buf.substr(I + 2);
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continue;
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}
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}
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}
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Preprocessed += Buf[0];
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Buf = Buf.substr(1);
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}
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return Preprocessed;
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}
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int main(int argc, char **argv) {
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InitLLVM X(argc, argv);
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cl::HideUnrelatedOptions(Cat);
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cl::ParseCommandLineOptions(
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argc, argv, "Create an object file from a YAML description", nullptr,
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nullptr, /*LongOptionsUseDoubleDash=*/true);
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auto ErrHandler = [](const Twine &Msg) {
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WithColor::error(errs(), "yaml2obj") << Msg << "\n";
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};
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std::error_code EC;
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std::unique_ptr<ToolOutputFile> Out(
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new ToolOutputFile(OutputFilename, EC, sys::fs::OF_None));
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if (EC) {
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ErrHandler("failed to open '" + OutputFilename + "': " + EC.message());
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return 1;
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}
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ErrorOr<std::unique_ptr<MemoryBuffer>> Buf =
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MemoryBuffer::getFileOrSTDIN(Input);
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if (!Buf)
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return 1;
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Optional<std::string> Buffer = preprocess(Buf.get()->getBuffer(), ErrHandler);
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if (!Buffer)
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return 1;
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yaml::Input YIn(*Buffer);
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if (!convertYAML(YIn, Out->os(), ErrHandler, DocNum,
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MaxSize == 0 ? UINT64_MAX : MaxSize))
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return 1;
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Out->keep();
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Out->os().flush();
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return 0;
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}
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