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llvm/tools/llvm-mc/llvm-mc.cpp
Kevin Enderby 613b757689 First part of support for generating dwarf for assembly source files with the 
-g flag.  In this part we generate the .file for the source being assembled and
the .loc's for the assembled instructions.

The next part will be to generate the dwarf Compile Unit DIE and a dwarf
subprogram DIE for each non-temporary label.

Once the next part is done test cases will be added.  rdar://9275556


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143509 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-01 22:27:22 +00:00

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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 "llvm/MC/MCParser/AsmLexer.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.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/MC/SubtargetFeature.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/system_error.h"
#include "Disassembler.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>
NoExecStack("mc-no-exec-stack", cl::desc("File doesn't need an exec stack"));
static cl::opt<bool>
EnableLogging("enable-api-logging", cl::desc("Enable MC API logging"));
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"));
enum ActionType {
AC_AsLex,
AC_Assemble,
AC_Disassemble,
AC_EDisassemble
};
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_EDisassemble, "edis",
"Enhanced disassembly of strings of hex bytes"),
clEnumValEnd));
static const Target *GetTarget(const char *ProgName) {
// Figure out the target triple.
if (TripleName.empty())
TripleName = sys::getDefaultTargetTriple();
Triple TheTriple(Triple::normalize(TripleName));
const Target *TheTarget = 0;
if (!ArchName.empty()) {
for (TargetRegistry::iterator it = TargetRegistry::begin(),
ie = TargetRegistry::end(); it != ie; ++it) {
if (ArchName == it->getName()) {
TheTarget = &*it;
break;
}
}
if (!TheTarget) {
errs() << ProgName << ": error: invalid target '" << ArchName << "'.\n";
return 0;
}
// Adjust the triple to match (if known), otherwise stick with the
// module/host triple.
Triple::ArchType Type = Triple::getArchTypeForLLVMName(ArchName);
if (Type != Triple::UnknownArch)
TheTriple.setArch(Type);
} else {
// Get the target specific parser.
std::string Error;
TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), Error);
if (TheTarget == 0) {
errs() << ProgName << ": error: unable to get target for '"
<< TheTriple.getTriple()
<< "', see --version and --triple.\n";
return 0;
}
}
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 int AsLexInput(const char *ProgName) {
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 TGParser 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);
const Target *TheTarget = GetTarget(ProgName);
if (!TheTarget)
return 1;
llvm::OwningPtr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(TripleName));
assert(MAI && "Unable to create target asm info!");
AsmLexer Lexer(*MAI);
Lexer.setBuffer(SrcMgr.getMemoryBuffer(0));
OwningPtr<tool_output_file> Out(GetOutputStream());
if (!Out)
return 1;
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::Register:
Out->os() << "register: " << Lexer.getTok().getRegVal();
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";
}
// Keep output if no errors.
if (Error == 0) Out->keep();
return Error;
}
static int AssembleInput(const char *ProgName) {
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<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(TripleName));
assert(MAI && "Unable to create target asm info!");
llvm::OwningPtr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
assert(MRI && "Unable to create target register 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, *MRI, MOFI.get());
MOFI->InitMCObjectFileInfo(TripleName, RelocModel, CMModel, Ctx);
if (SaveTempLabels)
Ctx.setAllowTemporaryLabels(false);
Ctx.setGenDwarfForAssembly(GenDwarfForAssembly);
// 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));
// FIXME: There is a bit of code duplication with addPassesToEmitFile.
if (FileType == OFT_AssemblyFile) {
MCInstPrinter *IP =
TheTarget->createMCInstPrinter(OutputAsmVariant, *MAI, *STI);
MCCodeEmitter *CE = 0;
MCAsmBackend *MAB = 0;
if (ShowEncoding) {
CE = TheTarget->createMCCodeEmitter(*MCII, *STI, Ctx);
MAB = TheTarget->createMCAsmBackend(TripleName);
}
Str.reset(TheTarget->createAsmStreamer(Ctx, FOS, /*asmverbose*/true,
/*useLoc*/ true,
/*useCFI*/ true,
/*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, *STI, Ctx);
MCAsmBackend *MAB = TheTarget->createMCAsmBackend(TripleName);
Str.reset(TheTarget->createMCObjectStreamer(TripleName, Ctx, *MAB,
FOS, CE, RelaxAll,
NoExecStack));
}
if (EnableLogging) {
Str.reset(createLoggingStreamer(Str.take(), errs()));
}
OwningPtr<MCAsmParser> Parser(createMCAsmParser(SrcMgr, Ctx,
*Str.get(), *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);
// Keep output if no errors.
if (Res == 0) Out->keep();
return Res;
}
static int DisassembleInput(const char *ProgName, bool Enhanced) {
const Target *TheTarget = GetTarget(ProgName);
if (!TheTarget)
return 0;
OwningPtr<MemoryBuffer> Buffer;
if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFilename, Buffer)) {
errs() << ProgName << ": " << ec.message() << '\n';
return 1;
}
OwningPtr<tool_output_file> Out(GetOutputStream());
if (!Out)
return 1;
int Res;
if (Enhanced) {
Res =
Disassembler::disassembleEnhanced(TripleName, *Buffer.take(), Out->os());
} else {
// 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();
}
Res = Disassembler::disassemble(*TheTarget, TripleName, MCPU, FeaturesStr,
*Buffer.take(), Out->os());
}
// Keep output if no errors.
if (Res == 0) Out->keep();
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();
cl::ParseCommandLineOptions(argc, argv, "llvm machine code playground\n");
TripleName = Triple::normalize(TripleName);
switch (Action) {
default:
case AC_AsLex:
return AsLexInput(argv[0]);
case AC_Assemble:
return AssembleInput(argv[0]);
case AC_Disassemble:
return DisassembleInput(argv[0], false);
case AC_EDisassemble:
return DisassembleInput(argv[0], true);
}
return 0;
}
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