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118 lines
3.5 KiB
C++
118 lines
3.5 KiB
C++
//===- yaml2obj - Convert YAML to a binary object file --------------------===//
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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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// 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 "yaml2obj.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/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/ToolOutputFile.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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static cl::opt<std::string>
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Input(cl::Positional, cl::desc("<input>"), cl::init("-"));
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// TODO: The "right" way to tell what kind of object file a given YAML file
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// corresponds to is to look at YAML "tags" (e.g. `!Foo`). Then, different
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// tags (`!ELF`, `!COFF`, etc.) would be used to discriminate between them.
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// Interpreting the tags is needed eventually for when writing test cases,
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// so that we can e.g. have `!Archive` contain a sequence of `!ELF`, and
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// just Do The Right Thing. However, interpreting these tags and acting on
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// them appropriately requires some work in the YAML parser and the YAMLIO
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// library.
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enum YAMLObjectFormat {
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YOF_COFF,
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YOF_ELF
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};
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cl::opt<YAMLObjectFormat> Format(
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"format",
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cl::desc("Interpret input as this type of object file"),
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cl::values(
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clEnumValN(YOF_COFF, "coff", "COFF object file format"),
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clEnumValN(YOF_ELF, "elf", "ELF object file format"),
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clEnumValEnd));
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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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static cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"),
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cl::value_desc("filename"));
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typedef int (*ConvertFuncPtr)(yaml::Input & YIn, raw_ostream &Out);
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static int convertYAML(yaml::Input &YIn, raw_ostream &Out,
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ConvertFuncPtr Convert) {
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unsigned CurDocNum = 0;
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do {
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if (++CurDocNum == DocNum)
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return Convert(YIn, Out);
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} while (YIn.nextDocument());
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errs() << "yaml2obj: Cannot find the " << DocNum
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<< llvm::getOrdinalSuffix(DocNum) << " document\n";
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return 1;
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}
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv);
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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if (OutputFilename.empty())
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OutputFilename = "-";
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std::error_code EC;
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std::unique_ptr<tool_output_file> Out(
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new tool_output_file(OutputFilename, EC, sys::fs::F_None));
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if (EC) {
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errs() << EC.message() << '\n';
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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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ConvertFuncPtr Convert = nullptr;
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if (Format == YOF_COFF)
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Convert = yaml2coff;
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else if (Format == YOF_ELF)
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Convert = yaml2elf;
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else {
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errs() << "Not yet implemented\n";
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return 1;
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}
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yaml::Input YIn(Buf.get()->getBuffer());
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int Res = convertYAML(YIn, Out->os(), Convert);
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if (Res == 0)
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Out->keep();
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return Res;
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}
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