411 lines
13 KiB
C++
411 lines
13 KiB
C++
//===-- llvm-mc.cpp - Machine Code Hacking Driver -------------------------===//
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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 utility is a simple driver that allows command line hacking on machine
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// code.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCParser/AsmLexer.h"
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#include "llvm/MC/MCParser/MCAsmLexer.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCInstPrinter.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Target/TargetAsmBackend.h"
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#include "llvm/Target/TargetAsmParser.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/Target/TargetMachine.h" // FIXME.
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#include "llvm/Target/TargetSelect.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/FileUtilities.h"
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#include "llvm/Support/FormattedStream.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/SourceMgr.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/System/Host.h"
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#include "llvm/System/Signals.h"
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#include "Disassembler.h"
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using namespace llvm;
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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::opt<std::string>
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OutputFilename("o", cl::desc("Output filename"),
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cl::value_desc("filename"));
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static cl::opt<bool>
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ShowEncoding("show-encoding", cl::desc("Show instruction encodings"));
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static cl::opt<bool>
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ShowInst("show-inst", cl::desc("Show internal instruction representation"));
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static cl::opt<bool>
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ShowInstOperands("show-inst-operands",
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cl::desc("Show instructions operands as parsed"));
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static cl::opt<unsigned>
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OutputAsmVariant("output-asm-variant",
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cl::desc("Syntax variant to use for output printing"));
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static cl::opt<bool>
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RelaxAll("mc-relax-all", cl::desc("Relax all fixups"));
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static cl::opt<bool>
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EnableLogging("enable-api-logging", cl::desc("Enable MC API logging"));
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enum OutputFileType {
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OFT_Null,
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OFT_AssemblyFile,
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OFT_ObjectFile
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};
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static cl::opt<OutputFileType>
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FileType("filetype", cl::init(OFT_AssemblyFile),
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cl::desc("Choose an output file type:"),
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cl::values(
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clEnumValN(OFT_AssemblyFile, "asm",
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"Emit an assembly ('.s') file"),
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clEnumValN(OFT_Null, "null",
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"Don't emit anything (for timing purposes)"),
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clEnumValN(OFT_ObjectFile, "obj",
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"Emit a native object ('.o') file"),
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clEnumValEnd));
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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 cl::opt<std::string>
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ArchName("arch", cl::desc("Target arch to assemble for, "
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"see -version for available targets"));
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static cl::opt<std::string>
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TripleName("triple", cl::desc("Target triple to assemble for, "
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"see -version for available targets"));
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static cl::opt<bool>
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NoInitialTextSection("n", cl::desc(
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"Don't assume assembly file starts in the text section"));
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enum ActionType {
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AC_AsLex,
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AC_Assemble,
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AC_Disassemble,
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AC_EDisassemble
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};
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static cl::opt<ActionType>
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Action(cl::desc("Action to perform:"),
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cl::init(AC_Assemble),
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cl::values(clEnumValN(AC_AsLex, "as-lex",
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"Lex tokens from a .s file"),
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clEnumValN(AC_Assemble, "assemble",
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"Assemble a .s file (default)"),
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clEnumValN(AC_Disassemble, "disassemble",
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"Disassemble strings of hex bytes"),
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clEnumValN(AC_EDisassemble, "edis",
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"Enhanced disassembly of strings of hex bytes"),
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clEnumValEnd));
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static const Target *GetTarget(const char *ProgName) {
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// Figure out the target triple.
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if (TripleName.empty())
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TripleName = sys::getHostTriple();
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if (!ArchName.empty()) {
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llvm::Triple TT(TripleName);
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TT.setArchName(ArchName);
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TripleName = TT.str();
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}
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// Get the target specific parser.
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std::string Error;
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const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
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if (TheTarget)
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return TheTarget;
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errs() << ProgName << ": error: unable to get target for '" << TripleName
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<< "', see --version and --triple.\n";
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return 0;
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}
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static tool_output_file *GetOutputStream() {
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if (OutputFilename == "")
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OutputFilename = "-";
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std::string Err;
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tool_output_file *Out = new tool_output_file(OutputFilename.c_str(), Err,
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raw_fd_ostream::F_Binary);
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if (!Err.empty()) {
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errs() << Err << '\n';
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delete Out;
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return 0;
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}
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return Out;
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}
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static int AsLexInput(const char *ProgName) {
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std::string ErrorMessage;
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MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename,
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&ErrorMessage);
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if (Buffer == 0) {
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errs() << ProgName << ": ";
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if (ErrorMessage.size())
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errs() << ErrorMessage << "\n";
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else
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errs() << "input file didn't read correctly.\n";
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return 1;
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}
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SourceMgr SrcMgr;
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// Tell SrcMgr about this buffer, which is what TGParser will pick up.
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SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
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// Record the location of the include directories so that the lexer can find
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// it later.
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SrcMgr.setIncludeDirs(IncludeDirs);
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const Target *TheTarget = GetTarget(ProgName);
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if (!TheTarget)
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return 1;
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llvm::OwningPtr<MCAsmInfo> MAI(TheTarget->createAsmInfo(TripleName));
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assert(MAI && "Unable to create target asm info!");
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AsmLexer Lexer(*MAI);
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Lexer.setBuffer(SrcMgr.getMemoryBuffer(0));
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OwningPtr<tool_output_file> Out(GetOutputStream());
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if (!Out)
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return 1;
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bool Error = false;
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while (Lexer.Lex().isNot(AsmToken::Eof)) {
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switch (Lexer.getKind()) {
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default:
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SrcMgr.PrintMessage(Lexer.getLoc(), "unknown token", "warning");
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Error = true;
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break;
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case AsmToken::Error:
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Error = true; // error already printed.
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break;
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case AsmToken::Identifier:
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Out->os() << "identifier: " << Lexer.getTok().getString() << '\n';
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break;
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case AsmToken::String:
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Out->os() << "string: " << Lexer.getTok().getString() << '\n';
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break;
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case AsmToken::Integer:
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Out->os() << "int: " << Lexer.getTok().getString() << '\n';
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break;
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case AsmToken::Amp: Out->os() << "Amp\n"; break;
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case AsmToken::AmpAmp: Out->os() << "AmpAmp\n"; break;
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case AsmToken::Caret: Out->os() << "Caret\n"; break;
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case AsmToken::Colon: Out->os() << "Colon\n"; break;
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case AsmToken::Comma: Out->os() << "Comma\n"; break;
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case AsmToken::Dollar: Out->os() << "Dollar\n"; break;
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case AsmToken::EndOfStatement: Out->os() << "EndOfStatement\n"; break;
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case AsmToken::Eof: Out->os() << "Eof\n"; break;
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case AsmToken::Equal: Out->os() << "Equal\n"; break;
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case AsmToken::EqualEqual: Out->os() << "EqualEqual\n"; break;
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case AsmToken::Exclaim: Out->os() << "Exclaim\n"; break;
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case AsmToken::ExclaimEqual: Out->os() << "ExclaimEqual\n"; break;
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case AsmToken::Greater: Out->os() << "Greater\n"; break;
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case AsmToken::GreaterEqual: Out->os() << "GreaterEqual\n"; break;
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case AsmToken::GreaterGreater: Out->os() << "GreaterGreater\n"; break;
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case AsmToken::LParen: Out->os() << "LParen\n"; break;
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case AsmToken::Less: Out->os() << "Less\n"; break;
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case AsmToken::LessEqual: Out->os() << "LessEqual\n"; break;
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case AsmToken::LessGreater: Out->os() << "LessGreater\n"; break;
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case AsmToken::LessLess: Out->os() << "LessLess\n"; break;
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case AsmToken::Minus: Out->os() << "Minus\n"; break;
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case AsmToken::Percent: Out->os() << "Percent\n"; break;
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case AsmToken::Pipe: Out->os() << "Pipe\n"; break;
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case AsmToken::PipePipe: Out->os() << "PipePipe\n"; break;
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case AsmToken::Plus: Out->os() << "Plus\n"; break;
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case AsmToken::RParen: Out->os() << "RParen\n"; break;
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case AsmToken::Slash: Out->os() << "Slash\n"; break;
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case AsmToken::Star: Out->os() << "Star\n"; break;
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case AsmToken::Tilde: Out->os() << "Tilde\n"; break;
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}
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}
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// Keep output if no errors.
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if (Error == 0) Out->keep();
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return Error;
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}
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static int AssembleInput(const char *ProgName) {
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const Target *TheTarget = GetTarget(ProgName);
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if (!TheTarget)
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return 1;
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std::string Error;
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MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename, &Error);
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if (Buffer == 0) {
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errs() << ProgName << ": ";
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if (Error.size())
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errs() << Error << "\n";
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else
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errs() << "input file didn't read correctly.\n";
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return 1;
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}
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SourceMgr SrcMgr;
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// Tell SrcMgr about this buffer, which is what the parser will pick up.
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SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
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// Record the location of the include directories so that the lexer can find
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// it later.
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SrcMgr.setIncludeDirs(IncludeDirs);
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llvm::OwningPtr<MCAsmInfo> MAI(TheTarget->createAsmInfo(TripleName));
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assert(MAI && "Unable to create target asm info!");
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MCContext Ctx(*MAI);
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// FIXME: We shouldn't need to do this (and link in codegen).
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OwningPtr<TargetMachine> TM(TheTarget->createTargetMachine(TripleName, ""));
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if (!TM) {
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errs() << ProgName << ": error: could not create target for triple '"
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<< TripleName << "'.\n";
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return 1;
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}
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OwningPtr<tool_output_file> Out(GetOutputStream());
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if (!Out)
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return 1;
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formatted_raw_ostream FOS(Out->os());
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OwningPtr<MCStreamer> Str;
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if (FileType == OFT_AssemblyFile) {
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MCInstPrinter *IP =
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TheTarget->createMCInstPrinter(OutputAsmVariant, *MAI);
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MCCodeEmitter *CE = 0;
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if (ShowEncoding)
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CE = TheTarget->createCodeEmitter(*TM, Ctx);
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Str.reset(createAsmStreamer(Ctx, FOS,
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TM->getTargetData()->isLittleEndian(),
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/*asmverbose*/true, IP, CE, ShowInst));
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} else if (FileType == OFT_Null) {
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Str.reset(createNullStreamer(Ctx));
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} else {
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assert(FileType == OFT_ObjectFile && "Invalid file type!");
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MCCodeEmitter *CE = TheTarget->createCodeEmitter(*TM, Ctx);
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TargetAsmBackend *TAB = TheTarget->createAsmBackend(TripleName);
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Str.reset(TheTarget->createObjectStreamer(TripleName, Ctx, *TAB,
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FOS, CE, RelaxAll));
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}
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if (EnableLogging) {
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Str.reset(createLoggingStreamer(Str.take(), errs()));
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}
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OwningPtr<MCAsmParser> Parser(createMCAsmParser(*TheTarget, SrcMgr, Ctx,
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*Str.get(), *MAI));
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OwningPtr<TargetAsmParser> TAP(TheTarget->createAsmParser(*Parser, *TM));
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if (!TAP) {
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errs() << ProgName
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<< ": error: this target does not support assembly parsing.\n";
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return 1;
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}
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Parser->setShowParsedOperands(ShowInstOperands);
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Parser->setTargetParser(*TAP.get());
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int Res = Parser->Run(NoInitialTextSection);
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// Keep output if no errors.
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if (Res == 0) Out->keep();
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return Res;
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}
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static int DisassembleInput(const char *ProgName, bool Enhanced) {
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const Target *TheTarget = GetTarget(ProgName);
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if (!TheTarget)
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return 0;
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std::string ErrorMessage;
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MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename,
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&ErrorMessage);
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if (Buffer == 0) {
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errs() << ProgName << ": ";
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if (ErrorMessage.size())
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errs() << ErrorMessage << "\n";
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else
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errs() << "input file didn't read correctly.\n";
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return 1;
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}
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OwningPtr<tool_output_file> Out(GetOutputStream());
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if (!Out)
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return 1;
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int Res;
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if (Enhanced)
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Res = Disassembler::disassembleEnhanced(TripleName, *Buffer, Out->os());
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else
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Res = Disassembler::disassemble(*TheTarget, TripleName, *Buffer, Out->os());
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// Keep output if no errors.
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if (Res == 0) Out->keep();
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return Res;
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}
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int main(int argc, char **argv) {
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// Print a stack trace if we signal out.
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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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// Initialize targets and assembly printers/parsers.
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llvm::InitializeAllTargetInfos();
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// FIXME: We shouldn't need to initialize the Target(Machine)s.
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llvm::InitializeAllTargets();
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llvm::InitializeAllAsmPrinters();
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llvm::InitializeAllAsmParsers();
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llvm::InitializeAllDisassemblers();
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cl::ParseCommandLineOptions(argc, argv, "llvm machine code playground\n");
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TripleName = Triple::normalize(TripleName);
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switch (Action) {
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default:
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case AC_AsLex:
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return AsLexInput(argv[0]);
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case AC_Assemble:
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return AssembleInput(argv[0]);
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case AC_Disassemble:
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return DisassembleInput(argv[0], false);
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case AC_EDisassemble:
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return DisassembleInput(argv[0], true);
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}
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return 0;
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}
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