llvm-mc.cpp revision 16cdcb38b2a5c5cdc216f9abafabd20e1ef7a254 
1//===-- llvm-mc.cpp - Machine Code Hacking Driver -------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This utility is a simple driver that allows command line hacking on machine
11// code.
12//
13//===----------------------------------------------------------------------===//
14
15#include "llvm/MC/MCContext.h"
16#include "llvm/MC/MCStreamer.h"
17#include "llvm/ADT/OwningPtr.h"
18#include "llvm/Support/CommandLine.h"
19#include "llvm/Support/ManagedStatic.h"
20#include "llvm/Support/MemoryBuffer.h"
21#include "llvm/Support/PrettyStackTrace.h"
22#include "llvm/Support/SourceMgr.h"
23#include "llvm/Support/raw_ostream.h"
24#include "llvm/System/Signals.h"
25#include "llvm/Target/TargetAsmParser.h"
26#include "llvm/Target/TargetRegistry.h"
27#include "llvm/Target/TargetSelect.h"
28#include "AsmParser.h"
29using namespace llvm;
30
31static cl::opt<std::string>
32InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
33
34static cl::opt<std::string>
35OutputFilename("o", cl::desc("Output filename"),
36               cl::value_desc("filename"));
37
38static cl::list<std::string>
39IncludeDirs("I", cl::desc("Directory of include files"),
40            cl::value_desc("directory"), cl::Prefix);
41
42static cl::opt<std::string>
43TripleName("triple", cl::desc("Target triple to assemble for,"
44                          "see -version for available targets"),
45       cl::init(LLVM_HOSTTRIPLE));
46
47enum ActionType {
48  AC_AsLex,
49  AC_Assemble
50};
51
52static cl::opt<ActionType>
53Action(cl::desc("Action to perform:"),
54       cl::init(AC_Assemble),
55       cl::values(clEnumValN(AC_AsLex, "as-lex",
56                             "Lex tokens from a .s file"),
57                  clEnumValN(AC_Assemble, "assemble",
58                             "Assemble a .s file (default)"),
59                  clEnumValEnd));
60
61static int AsLexInput(const char *ProgName) {
62  std::string ErrorMessage;
63  MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename,
64                                                      &ErrorMessage);
65  if (Buffer == 0) {
66    errs() << ProgName << ": ";
67    if (ErrorMessage.size())
68      errs() << ErrorMessage << "\n";
69    else
70      errs() << "input file didn't read correctly.\n";
71    return 1;
72  }
73
74  SourceMgr SrcMgr;
75
76  // Tell SrcMgr about this buffer, which is what TGParser will pick up.
77  SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
78
79  // Record the location of the include directories so that the lexer can find
80  // it later.
81  SrcMgr.setIncludeDirs(IncludeDirs);
82
83  AsmLexer Lexer(SrcMgr);
84
85  bool Error = false;
86
87  while (Lexer.Lex().isNot(AsmToken::Eof)) {
88    switch (Lexer.getKind()) {
89    default:
90      Lexer.PrintMessage(Lexer.getLoc(), "unknown token", "warning");
91      Error = true;
92      break;
93    case AsmToken::Error:
94      Error = true; // error already printed.
95      break;
96    case AsmToken::Identifier:
97      outs() << "identifier: " << Lexer.getTok().getString() << '\n';
98      break;
99    case AsmToken::Register:
100      outs() << "register: " << Lexer.getTok().getString() << '\n';
101      break;
102    case AsmToken::String:
103      outs() << "string: " << Lexer.getTok().getString() << '\n';
104      break;
105    case AsmToken::Integer:
106      outs() << "int: " << Lexer.getTok().getString() << '\n';
107      break;
108
109    case AsmToken::Amp:            outs() << "Amp\n"; break;
110    case AsmToken::AmpAmp:         outs() << "AmpAmp\n"; break;
111    case AsmToken::Caret:          outs() << "Caret\n"; break;
112    case AsmToken::Colon:          outs() << "Colon\n"; break;
113    case AsmToken::Comma:          outs() << "Comma\n"; break;
114    case AsmToken::Dollar:         outs() << "Dollar\n"; break;
115    case AsmToken::EndOfStatement: outs() << "EndOfStatement\n"; break;
116    case AsmToken::Eof:            outs() << "Eof\n"; break;
117    case AsmToken::Equal:          outs() << "Equal\n"; break;
118    case AsmToken::EqualEqual:     outs() << "EqualEqual\n"; break;
119    case AsmToken::Exclaim:        outs() << "Exclaim\n"; break;
120    case AsmToken::ExclaimEqual:   outs() << "ExclaimEqual\n"; break;
121    case AsmToken::Greater:        outs() << "Greater\n"; break;
122    case AsmToken::GreaterEqual:   outs() << "GreaterEqual\n"; break;
123    case AsmToken::GreaterGreater: outs() << "GreaterGreater\n"; break;
124    case AsmToken::LParen:         outs() << "LParen\n"; break;
125    case AsmToken::Less:           outs() << "Less\n"; break;
126    case AsmToken::LessEqual:      outs() << "LessEqual\n"; break;
127    case AsmToken::LessGreater:    outs() << "LessGreater\n"; break;
128    case AsmToken::LessLess:       outs() << "LessLess\n"; break;
129    case AsmToken::Minus:          outs() << "Minus\n"; break;
130    case AsmToken::Percent:        outs() << "Percent\n"; break;
131    case AsmToken::Pipe:           outs() << "Pipe\n"; break;
132    case AsmToken::PipePipe:       outs() << "PipePipe\n"; break;
133    case AsmToken::Plus:           outs() << "Plus\n"; break;
134    case AsmToken::RParen:         outs() << "RParen\n"; break;
135    case AsmToken::Slash:          outs() << "Slash\n"; break;
136    case AsmToken::Star:           outs() << "Star\n"; break;
137    case AsmToken::Tilde:          outs() << "Tilde\n"; break;
138    }
139  }
140
141  return Error;
142}
143
144static TargetAsmParser *GetTargetAsmParser(const char *ProgName,
145                                           MCAsmParser &Parser) {
146  // Get the target specific parser.
147  std::string Error;
148  const Target *TheTarget =
149    TargetRegistry::lookupTarget(TripleName,
150                                 /*FallbackToHost=*/true,
151                                 /*RequireJIT=*/false,
152                                 Error);
153  if (TheTarget == 0) {
154    errs() << ProgName << ": error: unable to get target for '" << TripleName
155           << "', see --version and --triple.\n";
156    return 0;
157  }
158
159  if (TargetAsmParser *TAP = TheTarget->createAsmParser(Parser))
160    return TAP;
161
162  errs() << ProgName
163         << ": error: this target does not support assembly parsing.\n";
164  return 0;
165}
166
167static int AssembleInput(const char *ProgName) {
168  std::string Error;
169  MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename, &Error);
170  if (Buffer == 0) {
171    errs() << ProgName << ": ";
172    if (Error.size())
173      errs() << Error << "\n";
174    else
175      errs() << "input file didn't read correctly.\n";
176    return 1;
177  }
178
179  SourceMgr SrcMgr;
180
181  // Tell SrcMgr about this buffer, which is what TGParser will pick up.
182  SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
183
184  // Record the location of the include directories so that the lexer can find
185  // it later.
186  SrcMgr.setIncludeDirs(IncludeDirs);
187
188  MCContext Ctx;
189  OwningPtr<MCStreamer> Str(createAsmStreamer(Ctx, outs()));
190
191  // FIXME: Target hook & command line option for initial section.
192  Str.get()->SwitchSection(Ctx.GetSection("__TEXT,__text,"
193                                          "regular,pure_instructions"));
194
195  AsmParser Parser(SrcMgr, Ctx, *Str.get());
196  OwningPtr<TargetAsmParser> TAP(GetTargetAsmParser(ProgName, Parser));
197  if (!TAP)
198    return 1;
199  Parser.setTargetParser(*TAP.get());
200  return Parser.Run();
201}
202
203
204int main(int argc, char **argv) {
205  // Print a stack trace if we signal out.
206  sys::PrintStackTraceOnErrorSignal();
207  PrettyStackTraceProgram X(argc, argv);
208  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
209
210  // Initialize targets and assembly parsers.
211  llvm::InitializeAllTargetInfos();
212  llvm::InitializeAllAsmParsers();
213
214  cl::ParseCommandLineOptions(argc, argv, "llvm machine code playground\n");
215
216  switch (Action) {
217  default:
218  case AC_AsLex:
219    return AsLexInput(argv[0]);
220  case AC_Assemble:
221    return AssembleInput(argv[0]);
222  }
223
224  return 0;
225}
226
227