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llvm-mirror/tools/llvm-mc/llvm-mc.cpp
Bill Wendling 49ef14ef73 Use pointers to the MCAsmInfo and MCRegInfo. 
Someone may want to do something crazy, like replace these objects if they
change or something.

No functionality change intended.

llvm-svn: 184175
2013-06-18 07:20:20 +00:00

486 lines
17 KiB
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//===-- llvm-mc.cpp - Machine Code Hacking Driver -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This utility is a simple driver that allows command line hacking on machine
// code.
//
//===----------------------------------------------------------------------===//
#include "Disassembler.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCParser/AsmLexer.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCTargetAsmParser.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.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"));
static cl::opt<bool>
ShowEncoding("show-encoding", cl::desc("Show instruction encodings"));
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>
RelaxAll("mc-relax-all", cl::desc("Relax all fixups"));
static cl::opt<bool>
DisableCFI("disable-cfi", cl::desc("Do not use .cfi_* directives"));
static cl::opt<bool>
NoExecStack("mc-no-exec-stack", cl::desc("File doesn't need an exec stack"));
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"),
clEnumValEnd));
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<Reloc::Model>
RelocModel("relocation-model",
cl::desc("Choose relocation model"),
cl::init(Reloc::Default),
cl::values(
clEnumValN(Reloc::Default, "default",
"Target default relocation model"),
clEnumValN(Reloc::Static, "static",
"Non-relocatable code"),
clEnumValN(Reloc::PIC_, "pic",
"Fully relocatable, position independent code"),
clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
"Relocatable external references, non-relocatable code"),
clEnumValEnd));
static cl::opt<llvm::CodeModel::Model>
CMModel("code-model",
cl::desc("Choose code model"),
cl::init(CodeModel::Default),
cl::values(clEnumValN(CodeModel::Default, "default",
"Target default code model"),
clEnumValN(CodeModel::Small, "small",
"Small code model"),
clEnumValN(CodeModel::Kernel, "kernel",
"Kernel code model"),
clEnumValN(CodeModel::Medium, "medium",
"Medium code model"),
clEnumValN(CodeModel::Large, "large",
"Large code model"),
clEnumValEnd));
static cl::opt<bool>
NoInitialTextSection("n", cl::desc("Don't assume assembly file starts "
"in the text section"));
static cl::opt<bool>
SaveTempLabels("L", cl::desc("Don't discard temporary labels"));
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::opt<std::string>
MainFileName("main-file-name",
cl::desc("Specifies the name we should consider the input file"));
enum ActionType {
AC_AsLex,
AC_Assemble,
AC_Disassemble,
AC_MDisassemble,
AC_HDisassemble
};
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"),
clEnumValN(AC_HDisassemble, "hdis",
"Disassemble strings of hex bytes printing "
"immediates as hex"),
clEnumValEnd));
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) {
errs() << ProgName << ": " << Error;
return 0;
}
// Update the triple name and return the found target.
TripleName = TheTriple.getTriple();
return TheTarget;
}
static tool_output_file *GetOutputStream() {
if (OutputFilename == "")
OutputFilename = "-";
std::string Err;
tool_output_file *Out = new tool_output_file(OutputFilename.c_str(), Err,
raw_fd_ostream::F_Binary);
if (!Err.empty()) {
errs() << Err << '\n';
delete Out;
return 0;
}
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(void) {
if(!getenv("DEBUG_PRODUCER"))
return;
DwarfDebugProducer += getenv("DEBUG_PRODUCER");
}
static int AsLexInput(SourceMgr &SrcMgr, MCAsmInfo &MAI, tool_output_file *Out) {
AsmLexer Lexer(MAI);
Lexer.setBuffer(SrcMgr.getMemoryBuffer(0));
bool Error = false;
while (Lexer.Lex().isNot(AsmToken::Eof)) {
AsmToken Tok = Lexer.getTok();
switch (Tok.getKind()) {
default:
SrcMgr.PrintMessage(Lexer.getLoc(), SourceMgr::DK_Warning,
"unknown token");
Error = true;
break;
case AsmToken::Error:
Error = true; // error already printed.
break;
case AsmToken::Identifier:
Out->os() << "identifier: " << Lexer.getTok().getString();
break;
case AsmToken::Integer:
Out->os() << "int: " << Lexer.getTok().getString();
break;
case AsmToken::Real:
Out->os() << "real: " << Lexer.getTok().getString();
break;
case AsmToken::String:
Out->os() << "string: " << Lexer.getTok().getString();
break;
case AsmToken::Amp: Out->os() << "Amp"; break;
case AsmToken::AmpAmp: Out->os() << "AmpAmp"; break;
case AsmToken::At: Out->os() << "At"; break;
case AsmToken::Caret: Out->os() << "Caret"; break;
case AsmToken::Colon: Out->os() << "Colon"; break;
case AsmToken::Comma: Out->os() << "Comma"; break;
case AsmToken::Dollar: Out->os() << "Dollar"; break;
case AsmToken::Dot: Out->os() << "Dot"; break;
case AsmToken::EndOfStatement: Out->os() << "EndOfStatement"; break;
case AsmToken::Eof: Out->os() << "Eof"; break;
case AsmToken::Equal: Out->os() << "Equal"; break;
case AsmToken::EqualEqual: Out->os() << "EqualEqual"; break;
case AsmToken::Exclaim: Out->os() << "Exclaim"; break;
case AsmToken::ExclaimEqual: Out->os() << "ExclaimEqual"; break;
case AsmToken::Greater: Out->os() << "Greater"; break;
case AsmToken::GreaterEqual: Out->os() << "GreaterEqual"; break;
case AsmToken::GreaterGreater: Out->os() << "GreaterGreater"; break;
case AsmToken::Hash: Out->os() << "Hash"; break;
case AsmToken::LBrac: Out->os() << "LBrac"; break;
case AsmToken::LCurly: Out->os() << "LCurly"; break;
case AsmToken::LParen: Out->os() << "LParen"; break;
case AsmToken::Less: Out->os() << "Less"; break;
case AsmToken::LessEqual: Out->os() << "LessEqual"; break;
case AsmToken::LessGreater: Out->os() << "LessGreater"; break;
case AsmToken::LessLess: Out->os() << "LessLess"; break;
case AsmToken::Minus: Out->os() << "Minus"; break;
case AsmToken::Percent: Out->os() << "Percent"; break;
case AsmToken::Pipe: Out->os() << "Pipe"; break;
case AsmToken::PipePipe: Out->os() << "PipePipe"; break;
case AsmToken::Plus: Out->os() << "Plus"; break;
case AsmToken::RBrac: Out->os() << "RBrac"; break;
case AsmToken::RCurly: Out->os() << "RCurly"; break;
case AsmToken::RParen: Out->os() << "RParen"; break;
case AsmToken::Slash: Out->os() << "Slash"; break;
case AsmToken::Star: Out->os() << "Star"; break;
case AsmToken::Tilde: Out->os() << "Tilde"; break;
}
// Print the token string.
Out->os() << " (\"";
Out->os().write_escaped(Tok.getString());
Out->os() << "\")\n";
}
return Error;
}
static int AssembleInput(const char *ProgName, const Target *TheTarget,
SourceMgr &SrcMgr, MCContext &Ctx, MCStreamer &Str,
MCAsmInfo &MAI, MCSubtargetInfo &STI) {
OwningPtr<MCAsmParser> Parser(createMCAsmParser(SrcMgr, Ctx,
Str, MAI));
OwningPtr<MCTargetAsmParser> TAP(TheTarget->createMCAsmParser(STI, *Parser));
if (!TAP) {
errs() << ProgName
<< ": error: this target does not support assembly parsing.\n";
return 1;
}
Parser->setShowParsedOperands(ShowInstOperands);
Parser->setTargetParser(*TAP.get());
int Res = Parser->Run(NoInitialTextSection);
return Res;
}
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
// 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");
TripleName = Triple::normalize(TripleName);
setDwarfDebugFlags(argc, argv);
setDwarfDebugProducer();
const char *ProgName = argv[0];
const Target *TheTarget = GetTarget(ProgName);
if (!TheTarget)
return 1;
OwningPtr<MemoryBuffer> BufferPtr;
if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFilename, BufferPtr)) {
errs() << ProgName << ": " << ec.message() << '\n';
return 1;
}
MemoryBuffer *Buffer = BufferPtr.take();
SourceMgr SrcMgr;
// Tell SrcMgr about this buffer, which is what the parser will pick up.
SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
// Record the location of the include directories so that the lexer can find
// it later.
SrcMgr.setIncludeDirs(IncludeDirs);
llvm::OwningPtr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
assert(MRI && "Unable to create target register info!");
llvm::OwningPtr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, TripleName));
assert(MAI && "Unable to create target asm info!");
// FIXME: This is not pretty. MCContext has a ptr to MCObjectFileInfo and
// MCObjectFileInfo needs a MCContext reference in order to initialize itself.
OwningPtr<MCObjectFileInfo> MOFI(new MCObjectFileInfo());
MCContext Ctx(MAI.get(), MRI.get(), MOFI.get(), &SrcMgr);
MOFI->InitMCObjectFileInfo(TripleName, RelocModel, CMModel, Ctx);
if (SaveTempLabels)
Ctx.setAllowTemporaryLabels(false);
Ctx.setGenDwarfForAssembly(GenDwarfForAssembly);
if (!DwarfDebugFlags.empty())
Ctx.setDwarfDebugFlags(StringRef(DwarfDebugFlags));
if (!DwarfDebugProducer.empty())
Ctx.setDwarfDebugProducer(StringRef(DwarfDebugProducer));
if (!DebugCompilationDir.empty())
Ctx.setCompilationDir(DebugCompilationDir);
if (!MainFileName.empty())
Ctx.setMainFileName(MainFileName);
// 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();
}
OwningPtr<tool_output_file> Out(GetOutputStream());
if (!Out)
return 1;
formatted_raw_ostream FOS(Out->os());
OwningPtr<MCStreamer> Str;
OwningPtr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
OwningPtr<MCSubtargetInfo>
STI(TheTarget->createMCSubtargetInfo(TripleName, MCPU, FeaturesStr));
MCInstPrinter *IP = NULL;
if (FileType == OFT_AssemblyFile) {
IP =
TheTarget->createMCInstPrinter(OutputAsmVariant, *MAI, *MCII, *MRI, *STI);
MCCodeEmitter *CE = 0;
MCAsmBackend *MAB = 0;
if (ShowEncoding) {
CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, *STI, Ctx);
MAB = TheTarget->createMCAsmBackend(TripleName, MCPU);
}
bool UseCFI = !DisableCFI;
Str.reset(TheTarget->createAsmStreamer(Ctx, FOS, /*asmverbose*/true,
/*useLoc*/ true,
UseCFI,
/*useDwarfDirectory*/ true,
IP, CE, MAB, ShowInst));
} else if (FileType == OFT_Null) {
Str.reset(createNullStreamer(Ctx));
} else {
assert(FileType == OFT_ObjectFile && "Invalid file type!");
MCCodeEmitter *CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, *STI, Ctx);
MCAsmBackend *MAB = TheTarget->createMCAsmBackend(TripleName, MCPU);
Str.reset(TheTarget->createMCObjectStreamer(TripleName, Ctx, *MAB,
FOS, CE, RelaxAll,
NoExecStack));
}
int Res = 1;
bool disassemble = false;
switch (Action) {
case AC_AsLex:
Res = AsLexInput(SrcMgr, *MAI, Out.get());
break;
case AC_Assemble:
Res = AssembleInput(ProgName, TheTarget, SrcMgr, Ctx, *Str, *MAI, *STI);
break;
case AC_MDisassemble:
assert(IP && "Expected assembly output");
IP->setUseMarkup(1);
disassemble = true;
break;
case AC_HDisassemble:
assert(IP && "Expected assembly output");
IP->setPrintImmHex(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();
return Res;
}
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