vendor/llvm/llvm-r126079

1 files changed, 255 insertions, 0 deletions

diff --git a/tools/llvm-objdump/llvm-objdump.cpp b/tools/llvm-objdump/llvm-objdump.cpp
new file mode 100644
index 0000000000000..1fef8b6e2496f
--- /dev/null
+++ b/tools/llvm-objdump/llvm-objdump.cpp
@@ -0,0 +1,255 @@
+//===-- llvm-objdump.cpp - Object file dumping utility for llvm -----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This program is a utility that works like binutils "objdump", that is, it
+// dumps out a plethora of information about an object file depending on the
+// flags.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/ObjectFile.h"
+// This config must be included before llvm-config.h.
+#include "llvm/Config/config.h"
+#include "../../lib/MC/MCDisassembler/EDDisassembler.h"
+#include "../../lib/MC/MCDisassembler/EDInst.h"
+#include "../../lib/MC/MCDisassembler/EDOperand.h"
+#include "../../lib/MC/MCDisassembler/EDToken.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCDisassembler.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstPrinter.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/MemoryObject.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/system_error.h"
+#include "llvm/Target/TargetRegistry.h"
+#include "llvm/Target/TargetSelect.h"
+#include <algorithm>
+#include <cctype>
+#include <cerrno>
+#include <cstring>
+#include <vector>
+using namespace llvm;
+using namespace object;
+
+namespace {
+  cl::list<std::string>
+  InputFilenames(cl::Positional, cl::desc("<input object files>"),
+                 cl::ZeroOrMore);
+
+  cl::opt<bool>
+  Disassemble("disassemble",
+    cl::desc("Display assembler mnemonics for the machine instructions"));
+  cl::alias
+  Disassembled("d", cl::desc("Alias for --disassemble"),
+               cl::aliasopt(Disassemble));
+
+  cl::opt<std::string>
+  TripleName("triple", cl::desc("Target triple to disassemble for, "
+                                "see -version for available targets"));
+
+  cl::opt<std::string>
+  ArchName("arch", cl::desc("Target arch to disassemble for, "
+                            "see -version for available targets"));
+
+  StringRef ToolName;
+}
+
+static const Target *GetTarget(const ObjectFile *Obj = NULL) {
+  // Figure out the target triple.
+  llvm::Triple TT("unknown-unknown-unknown");
+  if (TripleName.empty()) {
+    if (Obj)
+      TT.setArch(Triple::ArchType(Obj->getArch()));
+  } else
+    TT.setTriple(Triple::normalize(TripleName));
+
+  if (!ArchName.empty())
+    TT.setArchName(ArchName);
+
+  TripleName = TT.str();
+
+  // Get the target specific parser.
+  std::string Error;
+  const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
+  if (TheTarget)
+    return TheTarget;
+
+  errs() << ToolName << ": error: unable to get target for '" << TripleName
+         << "', see --version and --triple.\n";
+  return 0;
+}
+
+namespace {
+class StringRefMemoryObject : public MemoryObject {
+private:
+  StringRef Bytes;
+public:
+  StringRefMemoryObject(StringRef bytes) : Bytes(bytes) {}
+
+  uint64_t getBase() const { return 0; }
+  uint64_t getExtent() const { return Bytes.size(); }
+
+  int readByte(uint64_t Addr, uint8_t *Byte) const {
+    if (Addr > getExtent())
+      return -1;
+    *Byte = Bytes[Addr];
+    return 0;
+  }
+};
+}
+
+static void DumpBytes(StringRef bytes) {
+  static char hex_rep[] = "0123456789abcdef";
+  // FIXME: The real way to do this is to figure out the longest instruction
+  //        and align to that size before printing. I'll fix this when I get
+  //        around to outputting relocations.
+  // 15 is the longest x86 instruction
+  // 3 is for the hex rep of a byte + a space.
+  // 1 is for the null terminator.
+  enum { OutputSize = (15 * 3) + 1 };
+  char output[OutputSize];
+
+  assert(bytes.size() <= 15
+    && "DumpBytes only supports instructions of up to 15 bytes");
+  memset(output, ' ', sizeof(output));
+  unsigned index = 0;
+  for (StringRef::iterator i = bytes.begin(),
+                           e = bytes.end(); i != e; ++i) {
+    output[index] = hex_rep[(*i & 0xF0) >> 4];
+    output[index + 1] = hex_rep[*i & 0xF];
+    index += 3;
+  }
+
+  output[sizeof(output) - 1] = 0;
+  outs() << output;
+}
+
+static void DisassembleInput(const StringRef &Filename) {
+  OwningPtr<MemoryBuffer> Buff;
+
+  if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
+    errs() << ToolName << ": " << Filename << ": " << ec.message() << "\n";
+    return;
+  }
+
+  OwningPtr<ObjectFile> Obj(ObjectFile::createObjectFile(Buff.take()));
+
+  const Target *TheTarget = GetTarget(Obj.get());
+  if (!TheTarget) {
+    // GetTarget prints out stuff.
+    return;
+  }
+
+  outs() << '\n';
+  outs() << Filename
+         << ":\tfile format " << Obj->getFileFormatName() << "\n\n\n";
+
+  for (ObjectFile::section_iterator i = Obj->begin_sections(),
+                                    e = Obj->end_sections();
+                                    i != e; ++i) {
+    if (!i->isText())
+      continue;
+    outs() << "Disassembly of section " << i->getName() << ":\n\n";
+
+    // Set up disassembler.
+    OwningPtr<const MCAsmInfo> AsmInfo(TheTarget->createAsmInfo(TripleName));
+
+    if (!AsmInfo) {
+      errs() << "error: no assembly info for target " << TripleName << "\n";
+      return;
+    }
+
+    OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler());
+    if (!DisAsm) {
+      errs() << "error: no disassembler for target " << TripleName << "\n";
+      return;
+    }
+
+    int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
+    OwningPtr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
+                                  AsmPrinterVariant, *AsmInfo));
+    if (!IP) {
+      errs() << "error: no instruction printer for target " << TripleName << '\n';
+      return;
+    }
+
+    StringRef Bytes = i->getContents();
+    StringRefMemoryObject memoryObject(Bytes);
+    uint64_t Size;
+    uint64_t Index;
+
+    for (Index = 0; Index < Bytes.size(); Index += Size) {
+      MCInst Inst;
+
+#     ifndef NDEBUG
+      raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
+#     else
+      raw_ostream &DebugOut = nulls();
+#     endif
+
+      if (DisAsm->getInstruction(Inst, Size, memoryObject, Index, DebugOut)) {
+        outs() << format("%8x:\t", i->getAddress() + Index);
+        DumpBytes(StringRef(Bytes.data() + Index, Size));
+        IP->printInst(&Inst, outs());
+        outs() << "\n";
+      } else {
+        errs() << ToolName << ": warning: invalid instruction encoding\n";
+        if (Size == 0)
+          Size = 1; // skip illegible bytes
+      }
+    }
+  }
+}
+
+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();
+  // FIXME: We shouldn't need to initialize the Target(Machine)s.
+  llvm::InitializeAllTargets();
+  llvm::InitializeAllAsmPrinters();
+  llvm::InitializeAllAsmParsers();
+  llvm::InitializeAllDisassemblers();
+
+  cl::ParseCommandLineOptions(argc, argv, "llvm object file dumper\n");
+  TripleName = Triple::normalize(TripleName);
+
+  ToolName = argv[0];
+
+  // Defaults to a.out if no filenames specified.
+  if (InputFilenames.size() == 0)
+    InputFilenames.push_back("a.out");
+
+  // -d is the only flag that is currently implemented, so just print help if
+  // it is not set.
+  if (!Disassemble) {
+    cl::PrintHelpMessage();
+    return 2;
+  }
+
+  std::for_each(InputFilenames.begin(), InputFilenames.end(),
+                DisassembleInput);
+
+  return 0;
+}