llvm-mc.cpp revision a5881e3060aee9f82aef3747a97650e5eafe893a 
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/TargetRegistry.h"
26#include "llvm/Target/TargetSelect.h"
27#include "AsmParser.h"
28using namespace llvm;
29
30static cl::opt<std::string>
31InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
32
33static cl::opt<std::string>
34OutputFilename("o", cl::desc("Output filename"),
35               cl::value_desc("filename"));
36
37static cl::list<std::string>
38IncludeDirs("I", cl::desc("Directory of include files"),
39            cl::value_desc("directory"), cl::Prefix);
40
41static cl::opt<std::string>
42Triple("triple", cl::desc("Target triple to assemble for,"
43                          "see -version for available targets"),
44       cl::init(LLVM_HOSTTRIPLE));
45
46enum ActionType {
47  AC_AsLex,
48  AC_Assemble
49};
50
51static cl::opt<ActionType>
52Action(cl::desc("Action to perform:"),
53       cl::init(AC_Assemble),
54       cl::values(clEnumValN(AC_AsLex, "as-lex",
55                             "Lex tokens from a .s file"),
56                  clEnumValN(AC_Assemble, "assemble",
57                             "Assemble a .s file (default)"),
58                  clEnumValEnd));
59
60static int AsLexInput(const char *ProgName) {
61  std::string ErrorMessage;
62  MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename,
63                                                      &ErrorMessage);
64  if (Buffer == 0) {
65    errs() << ProgName << ": ";
66    if (ErrorMessage.size())
67      errs() << ErrorMessage << "\n";
68    else
69      errs() << "input file didn't read correctly.\n";
70    return 1;
71  }
72
73  SourceMgr SrcMgr;
74
75  // Tell SrcMgr about this buffer, which is what TGParser will pick up.
76  SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
77
78  // Record the location of the include directories so that the lexer can find
79  // it later.
80  SrcMgr.setIncludeDirs(IncludeDirs);
81
82  AsmLexer Lexer(SrcMgr);
83
84  bool Error = false;
85
86  asmtok::TokKind Tok = Lexer.Lex();
87  while (Tok != asmtok::Eof) {
88    switch (Tok) {
89    default:
90      Lexer.PrintMessage(Lexer.getLoc(), "unknown token", "warning");
91      Error = true;
92      break;
93    case asmtok::Error:
94      Error = true; // error already printed.
95      break;
96    case asmtok::Identifier:
97      outs() << "identifier: " << Lexer.getCurStrVal() << '\n';
98      break;
99    case asmtok::Register:
100      outs() << "register: " << Lexer.getCurStrVal() << '\n';
101      break;
102    case asmtok::String:
103      outs() << "string: " << Lexer.getCurStrVal() << '\n';
104      break;
105    case asmtok::IntVal:
106      outs() << "int: " << Lexer.getCurIntVal() << '\n';
107      break;
108
109    case asmtok::Amp:            outs() << "Amp\n"; break;
110    case asmtok::AmpAmp:         outs() << "AmpAmp\n"; break;
111    case asmtok::Caret:          outs() << "Caret\n"; break;
112    case asmtok::Colon:          outs() << "Colon\n"; break;
113    case asmtok::Comma:          outs() << "Comma\n"; break;
114    case asmtok::Dollar:         outs() << "Dollar\n"; break;
115    case asmtok::EndOfStatement: outs() << "EndOfStatement\n"; break;
116    case asmtok::Eof:            outs() << "Eof\n"; break;
117    case asmtok::Equal:          outs() << "Equal\n"; break;
118    case asmtok::EqualEqual:     outs() << "EqualEqual\n"; break;
119    case asmtok::Exclaim:        outs() << "Exclaim\n"; break;
120    case asmtok::ExclaimEqual:   outs() << "ExclaimEqual\n"; break;
121    case asmtok::Greater:        outs() << "Greater\n"; break;
122    case asmtok::GreaterEqual:   outs() << "GreaterEqual\n"; break;
123    case asmtok::GreaterGreater: outs() << "GreaterGreater\n"; break;
124    case asmtok::LParen:         outs() << "LParen\n"; break;
125    case asmtok::Less:           outs() << "Less\n"; break;
126    case asmtok::LessEqual:      outs() << "LessEqual\n"; break;
127    case asmtok::LessGreater:    outs() << "LessGreater\n"; break;
128    case asmtok::LessLess:       outs() << "LessLess\n"; break;
129    case asmtok::Minus:          outs() << "Minus\n"; break;
130    case asmtok::Percent:        outs() << "Percent\n"; break;
131    case asmtok::Pipe:           outs() << "Pipe\n"; break;
132    case asmtok::PipePipe:       outs() << "PipePipe\n"; break;
133    case asmtok::Plus:           outs() << "Plus\n"; break;
134    case asmtok::RParen:         outs() << "RParen\n"; break;
135    case asmtok::Slash:          outs() << "Slash\n"; break;
136    case asmtok::Star:           outs() << "Star\n"; break;
137    case asmtok::Tilde:          outs() << "Tilde\n"; break;
138    }
139
140    Tok = Lexer.Lex();
141  }
142
143  return Error;
144}
145
146static int AssembleInput(const char *ProgName) {
147  // Get the target specific parser.
148  std::string Error;
149  const Target *TheTarget =
150    TargetRegistry::lookupTarget(Triple,
151                                 /*FallbackToHost=*/true,
152                                 /*RequireJIT=*/false,
153                                 Error);
154  if (TheTarget == 0) {
155    errs() << ProgName << ": error: unable to get target for '" << Triple
156           << "', see --version and --triple.\n";
157    return 1;
158  }
159
160  TargetAsmParser *TAP = TheTarget->createAsmParser();
161  if (!TAP) {
162    errs() << ProgName
163           << ": error: this target does not support assembly parsing.\n";
164    return 1;
165  }
166
167  std::string ErrorMessage;
168  MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename,
169                                                      &ErrorMessage);
170  if (Buffer == 0) {
171    errs() << ProgName << ": ";
172    if (ErrorMessage.size())
173      errs() << ErrorMessage << "\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(), *TAP);
196  return Parser.Run();
197}
198
199
200int main(int argc, char **argv) {
201  // Print a stack trace if we signal out.
202  sys::PrintStackTraceOnErrorSignal();
203  PrettyStackTraceProgram X(argc, argv);
204  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
205
206  // Initialize targets and assembly parsers.
207  llvm::InitializeAllTargetInfos();
208  llvm::InitializeAllAsmParsers();
209
210  cl::ParseCommandLineOptions(argc, argv, "llvm machine code playground\n");
211
212  switch (Action) {
213  default:
214  case AC_AsLex:
215    return AsLexInput(argv[0]);
216  case AC_Assemble:
217    return AssembleInput(argv[0]);
218  }
219
220  return 0;
221}
222
223