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llvm-mirror/tools/llvm-mc/llvm-mc.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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//===-- llvm-mc.cpp - Machine Code Hacking Driver ---------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This utility is a simple driver that allows command line hacking on machine
// code.
//
//===----------------------------------------------------------------------===//
#include "Disassembler.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCParser/AsmLexer.h"
#include "llvm/MC/MCParser/MCTargetAsmParser.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCTargetOptionsCommandFlags.inc"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compression.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/WithColor.h"
using namespace llvm;
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
static cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"),
cl::value_desc("filename"),
cl::init("-"));
static cl::opt<std::string> SplitDwarfFile("split-dwarf-file",
cl::desc("DWO output filename"),
cl::value_desc("filename"));
static cl::opt<bool>
ShowEncoding("show-encoding", cl::desc("Show instruction encodings"));
static cl::opt<bool> RelaxELFRel(
"relax-relocations", cl::init(true),
cl::desc("Emit R_X86_64_GOTPCRELX instead of R_X86_64_GOTPCREL"));
static cl::opt<DebugCompressionType> CompressDebugSections(
"compress-debug-sections", cl::ValueOptional,
cl::init(DebugCompressionType::None),
cl::desc("Choose DWARF debug sections compression:"),
cl::values(clEnumValN(DebugCompressionType::None, "none", "No compression"),
clEnumValN(DebugCompressionType::Z, "zlib",
"Use zlib compression"),
clEnumValN(DebugCompressionType::GNU, "zlib-gnu",
"Use zlib-gnu compression (deprecated)")));
static cl::opt<bool>
ShowInst("show-inst", cl::desc("Show internal instruction representation"));
static cl::opt<bool>
ShowInstOperands("show-inst-operands",
cl::desc("Show instructions operands as parsed"));
static cl::opt<unsigned>
OutputAsmVariant("output-asm-variant",
cl::desc("Syntax variant to use for output printing"));
static cl::opt<bool>
PrintImmHex("print-imm-hex", cl::init(false),
cl::desc("Prefer hex format for immediate values"));
static cl::list<std::string>
DefineSymbol("defsym", cl::desc("Defines a symbol to be an integer constant"));
static cl::opt<bool>
PreserveComments("preserve-comments",
cl::desc("Preserve Comments in outputted assembly"));
enum OutputFileType {
OFT_Null,
OFT_AssemblyFile,
OFT_ObjectFile
};
static cl::opt<OutputFileType>
FileType("filetype", cl::init(OFT_AssemblyFile),
cl::desc("Choose an output file type:"),
cl::values(
clEnumValN(OFT_AssemblyFile, "asm",
"Emit an assembly ('.s') file"),
clEnumValN(OFT_Null, "null",
"Don't emit anything (for timing purposes)"),
clEnumValN(OFT_ObjectFile, "obj",
"Emit a native object ('.o') file")));
static cl::list<std::string>
IncludeDirs("I", cl::desc("Directory of include files"),
cl::value_desc("directory"), cl::Prefix);
static cl::opt<std::string>
ArchName("arch", cl::desc("Target arch to assemble for, "
"see -version for available targets"));
static cl::opt<std::string>
TripleName("triple", cl::desc("Target triple to assemble for, "
"see -version for available targets"));
static cl::opt<std::string>
MCPU("mcpu",
cl::desc("Target a specific cpu type (-mcpu=help for details)"),
cl::value_desc("cpu-name"),
cl::init(""));
static cl::list<std::string>
MAttrs("mattr",
cl::CommaSeparated,
cl::desc("Target specific attributes (-mattr=help for details)"),
cl::value_desc("a1,+a2,-a3,..."));
static cl::opt<bool> PIC("position-independent",
cl::desc("Position independent"), cl::init(false));
static cl::opt<bool>
LargeCodeModel("large-code-model",
cl::desc("Create cfi directives that assume the code might "
"be more than 2gb away"));
static cl::opt<bool>
NoInitialTextSection("n", cl::desc("Don't assume assembly file starts "
"in the text section"));
static cl::opt<bool>
GenDwarfForAssembly("g", cl::desc("Generate dwarf debugging info for assembly "
"source files"));
static cl::opt<std::string>
DebugCompilationDir("fdebug-compilation-dir",
cl::desc("Specifies the debug info's compilation dir"));
static cl::list<std::string>
DebugPrefixMap("fdebug-prefix-map",
cl::desc("Map file source paths in debug info"),
cl::value_desc("= separated key-value pairs"));
static cl::opt<std::string>
MainFileName("main-file-name",
cl::desc("Specifies the name we should consider the input file"));
static cl::opt<bool> SaveTempLabels("save-temp-labels",
cl::desc("Don't discard temporary labels"));
static cl::opt<bool> LexMasmIntegers(
"masm-integers",
cl::desc("Enable binary and hex masm integers (0b110 and 0ABCh)"));
static cl::opt<bool> NoExecStack("no-exec-stack",
cl::desc("File doesn't need an exec stack"));
enum ActionType {
AC_AsLex,
AC_Assemble,
AC_Disassemble,
AC_MDisassemble,
};
static cl::opt<ActionType>
Action(cl::desc("Action to perform:"),
cl::init(AC_Assemble),
cl::values(clEnumValN(AC_AsLex, "as-lex",
"Lex tokens from a .s file"),
clEnumValN(AC_Assemble, "assemble",
"Assemble a .s file (default)"),
clEnumValN(AC_Disassemble, "disassemble",
"Disassemble strings of hex bytes"),
clEnumValN(AC_MDisassemble, "mdis",
"Marked up disassembly of strings of hex bytes")));
static const Target *GetTarget(const char *ProgName) {
// Figure out the target triple.
if (TripleName.empty())
TripleName = sys::getDefaultTargetTriple();
Triple TheTriple(Triple::normalize(TripleName));
// Get the target specific parser.
std::string Error;
const Target *TheTarget = TargetRegistry::lookupTarget(ArchName, TheTriple,
Error);
if (!TheTarget) {
WithColor::error(errs(), ProgName) << Error;
return nullptr;
}
// Update the triple name and return the found target.
TripleName = TheTriple.getTriple();
return TheTarget;
}
static std::unique_ptr<ToolOutputFile> GetOutputStream(StringRef Path) {
std::error_code EC;
auto Out = llvm::make_unique<ToolOutputFile>(Path, EC, sys::fs::F_None);
if (EC) {
WithColor::error() << EC.message() << '\n';
return nullptr;
}
return Out;
}
static std::string DwarfDebugFlags;
static void setDwarfDebugFlags(int argc, char **argv) {
if (!getenv("RC_DEBUG_OPTIONS"))
return;
for (int i = 0; i < argc; i++) {
DwarfDebugFlags += argv[i];
if (i + 1 < argc)
DwarfDebugFlags += " ";
}
}
static std::string DwarfDebugProducer;
static void setDwarfDebugProducer() {
if(!getenv("DEBUG_PRODUCER"))
return;
DwarfDebugProducer += getenv("DEBUG_PRODUCER");
}
static int AsLexInput(SourceMgr &SrcMgr, MCAsmInfo &MAI,
raw_ostream &OS) {
AsmLexer Lexer(MAI);
Lexer.setBuffer(SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID())->getBuffer());
bool Error = false;
while (Lexer.Lex().isNot(AsmToken::Eof)) {
Lexer.getTok().dump(OS);
OS << "\n";
if (Lexer.getTok().getKind() == AsmToken::Error)
Error = true;
}
return Error;
}
static int fillCommandLineSymbols(MCAsmParser &Parser) {
for (auto &I: DefineSymbol) {
auto Pair = StringRef(I).split('=');
auto Sym = Pair.first;
auto Val = Pair.second;
if (Sym.empty() || Val.empty()) {
WithColor::error() << "defsym must be of the form: sym=value: " << I
<< "\n";
return 1;
}
int64_t Value;
if (Val.getAsInteger(0, Value)) {
WithColor::error() << "value is not an integer: " << Val << "\n";
return 1;
}
Parser.getContext().setSymbolValue(Parser.getStreamer(), Sym, Value);
}
return 0;
}
static int AssembleInput(const char *ProgName, const Target *TheTarget,
SourceMgr &SrcMgr, MCContext &Ctx, MCStreamer &Str,
MCAsmInfo &MAI, MCSubtargetInfo &STI,
MCInstrInfo &MCII, MCTargetOptions &MCOptions) {
std::unique_ptr<MCAsmParser> Parser(
createMCAsmParser(SrcMgr, Ctx, Str, MAI));
std::unique_ptr<MCTargetAsmParser> TAP(
TheTarget->createMCAsmParser(STI, *Parser, MCII, MCOptions));
if (!TAP) {
WithColor::error(errs(), ProgName)
<< "this target does not support assembly parsing.\n";
return 1;
}
int SymbolResult = fillCommandLineSymbols(*Parser);
if(SymbolResult)
return SymbolResult;
Parser->setShowParsedOperands(ShowInstOperands);
Parser->setTargetParser(*TAP);
Parser->getLexer().setLexMasmIntegers(LexMasmIntegers);
int Res = Parser->Run(NoInitialTextSection);
return Res;
}
int main(int argc, char **argv) {
InitLLVM X(argc, argv);
// Initialize targets and assembly printers/parsers.
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllDisassemblers();
// Register the target printer for --version.
cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
cl::ParseCommandLineOptions(argc, argv, "llvm machine code playground\n");
MCTargetOptions MCOptions = InitMCTargetOptionsFromFlags();
setDwarfDebugFlags(argc, argv);
setDwarfDebugProducer();
const char *ProgName = argv[0];
const Target *TheTarget = GetTarget(ProgName);
if (!TheTarget)
return 1;
// Now that GetTarget() has (potentially) replaced TripleName, it's safe to
// construct the Triple object.
Triple TheTriple(TripleName);
ErrorOr<std::unique_ptr<MemoryBuffer>> BufferPtr =
MemoryBuffer::getFileOrSTDIN(InputFilename);
if (std::error_code EC = BufferPtr.getError()) {
WithColor::error(errs(), ProgName)
<< InputFilename << ": " << EC.message() << '\n';
return 1;
}
MemoryBuffer *Buffer = BufferPtr->get();
SourceMgr SrcMgr;
// Tell SrcMgr about this buffer, which is what the parser will pick up.
SrcMgr.AddNewSourceBuffer(std::move(*BufferPtr), SMLoc());
// Record the location of the include directories so that the lexer can find
// it later.
SrcMgr.setIncludeDirs(IncludeDirs);
std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
assert(MRI && "Unable to create target register info!");
std::unique_ptr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, TripleName));
assert(MAI && "Unable to create target asm info!");
MAI->setRelaxELFRelocations(RelaxELFRel);
if (CompressDebugSections != DebugCompressionType::None) {
if (!zlib::isAvailable()) {
WithColor::error(errs(), ProgName)
<< "build tools with zlib to enable -compress-debug-sections";
return 1;
}
MAI->setCompressDebugSections(CompressDebugSections);
}
MAI->setPreserveAsmComments(PreserveComments);
// FIXME: This is not pretty. MCContext has a ptr to MCObjectFileInfo and
// MCObjectFileInfo needs a MCContext reference in order to initialize itself.
MCObjectFileInfo MOFI;
MCContext Ctx(MAI.get(), MRI.get(), &MOFI, &SrcMgr);
MOFI.InitMCObjectFileInfo(TheTriple, PIC, Ctx, LargeCodeModel);
if (SaveTempLabels)
Ctx.setAllowTemporaryLabels(false);
Ctx.setGenDwarfForAssembly(GenDwarfForAssembly);
// Default to 4 for dwarf version.
unsigned DwarfVersion = MCOptions.DwarfVersion ? MCOptions.DwarfVersion : 4;
if (DwarfVersion < 2 || DwarfVersion > 5) {
errs() << ProgName << ": Dwarf version " << DwarfVersion
<< " is not supported." << '\n';
return 1;
}
Ctx.setDwarfVersion(DwarfVersion);
if (!DwarfDebugFlags.empty())
Ctx.setDwarfDebugFlags(StringRef(DwarfDebugFlags));
if (!DwarfDebugProducer.empty())
Ctx.setDwarfDebugProducer(StringRef(DwarfDebugProducer));
if (!DebugCompilationDir.empty())
Ctx.setCompilationDir(DebugCompilationDir);
else {
// If no compilation dir is set, try to use the current directory.
SmallString<128> CWD;
if (!sys::fs::current_path(CWD))
Ctx.setCompilationDir(CWD);
}
for (const auto &Arg : DebugPrefixMap) {
const auto &KV = StringRef(Arg).split('=');
Ctx.addDebugPrefixMapEntry(KV.first, KV.second);
}
if (!MainFileName.empty())
Ctx.setMainFileName(MainFileName);
if (GenDwarfForAssembly && DwarfVersion >= 5) {
// DWARF v5 needs the root file as well as the compilation directory.
// If we find a '.file 0' directive that will supersede these values.
MD5 Hash;
MD5::MD5Result *Cksum =
(MD5::MD5Result *)Ctx.allocate(sizeof(MD5::MD5Result), 1);
Hash.update(Buffer->getBuffer());
Hash.final(*Cksum);
Ctx.setMCLineTableRootFile(
/*CUID=*/0, Ctx.getCompilationDir(),
!MainFileName.empty() ? MainFileName : InputFilename, Cksum, None);
}
// Package up features to be passed to target/subtarget
std::string FeaturesStr;
if (MAttrs.size()) {
SubtargetFeatures Features;
for (unsigned i = 0; i != MAttrs.size(); ++i)
Features.AddFeature(MAttrs[i]);
FeaturesStr = Features.getString();
}
std::unique_ptr<ToolOutputFile> Out = GetOutputStream(OutputFilename);
if (!Out)
return 1;
std::unique_ptr<ToolOutputFile> DwoOut;
if (!SplitDwarfFile.empty()) {
if (FileType != OFT_ObjectFile) {
WithColor::error() << "dwo output only supported with object files\n";
return 1;
}
DwoOut = GetOutputStream(SplitDwarfFile);
if (!DwoOut)
return 1;
}
std::unique_ptr<buffer_ostream> BOS;
raw_pwrite_stream *OS = &Out->os();
std::unique_ptr<MCStreamer> Str;
std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
std::unique_ptr<MCSubtargetInfo> STI(
TheTarget->createMCSubtargetInfo(TripleName, MCPU, FeaturesStr));
MCInstPrinter *IP = nullptr;
if (FileType == OFT_AssemblyFile) {
IP = TheTarget->createMCInstPrinter(Triple(TripleName), OutputAsmVariant,
*MAI, *MCII, *MRI);
if (!IP) {
WithColor::error()
<< "unable to create instruction printer for target triple '"
<< TheTriple.normalize() << "' with assembly variant "
<< OutputAsmVariant << ".\n";
return 1;
}
// Set the display preference for hex vs. decimal immediates.
IP->setPrintImmHex(PrintImmHex);
// Set up the AsmStreamer.
std::unique_ptr<MCCodeEmitter> CE;
if (ShowEncoding)
CE.reset(TheTarget->createMCCodeEmitter(*MCII, *MRI, Ctx));
std::unique_ptr<MCAsmBackend> MAB(
TheTarget->createMCAsmBackend(*STI, *MRI, MCOptions));
auto FOut = llvm::make_unique<formatted_raw_ostream>(*OS);
Str.reset(
TheTarget->createAsmStreamer(Ctx, std::move(FOut), /*asmverbose*/ true,
/*useDwarfDirectory*/ true, IP,
std::move(CE), std::move(MAB), ShowInst));
} else if (FileType == OFT_Null) {
Str.reset(TheTarget->createNullStreamer(Ctx));
} else {
assert(FileType == OFT_ObjectFile && "Invalid file type!");
// Don't waste memory on names of temp labels.
Ctx.setUseNamesOnTempLabels(false);
if (!Out->os().supportsSeeking()) {
BOS = make_unique<buffer_ostream>(Out->os());
OS = BOS.get();
}
MCCodeEmitter *CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, Ctx);
MCAsmBackend *MAB = TheTarget->createMCAsmBackend(*STI, *MRI, MCOptions);
Str.reset(TheTarget->createMCObjectStreamer(
TheTriple, Ctx, std::unique_ptr<MCAsmBackend>(MAB),
DwoOut ? MAB->createDwoObjectWriter(*OS, DwoOut->os())
: MAB->createObjectWriter(*OS),
std::unique_ptr<MCCodeEmitter>(CE), *STI, MCOptions.MCRelaxAll,
MCOptions.MCIncrementalLinkerCompatible,
/*DWARFMustBeAtTheEnd*/ false));
if (NoExecStack)
Str->InitSections(true);
}
// Use Assembler information for parsing.
Str->setUseAssemblerInfoForParsing(true);
int Res = 1;
bool disassemble = false;
switch (Action) {
case AC_AsLex:
Res = AsLexInput(SrcMgr, *MAI, Out->os());
break;
case AC_Assemble:
Res = AssembleInput(ProgName, TheTarget, SrcMgr, Ctx, *Str, *MAI, *STI,
*MCII, MCOptions);
break;
case AC_MDisassemble:
assert(IP && "Expected assembly output");
IP->setUseMarkup(1);
disassemble = true;
break;
case AC_Disassemble:
disassemble = true;
break;
}
if (disassemble)
Res = Disassembler::disassemble(*TheTarget, TripleName, *STI, *Str,
*Buffer, SrcMgr, Out->os());
// Keep output if no errors.
if (Res == 0) {
Out->keep();
if (DwoOut)
DwoOut->keep();
}
return Res;
}
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